scripts/checkpatch.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2001, Dave Jones. (the file handling bit)
   3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6 # Licensed under the terms of the GNU GPL License version 2
   7
   8 use strict;
   9 use POSIX;
  10 use File::Basename;
  11 use Cwd 'abs_path';
  12 use Term::ANSIColor qw(:constants);
  13
  14 my $P = $0;
  15 my $D = dirname(abs_path($P));
  16
  17 my $V = '0.32';
  18
  19 use Getopt::Long qw(:config no_auto_abbrev);
  20
  21 my $quiet = 0;
  22 my $tree = 1;
  23 my $chk_signoff = 1;
  24 my $chk_patch = 1;
  25 my $tst_only;
  26 my $emacs = 0;
  27 my $terse = 0;
  28 my $showfile = 0;
  29 my $file = 0;
  30 my $check = 0;
  31 my $check_orig = 0;
  32 my $summary = 1;
  33 my $mailback = 0;
  34 my $summary_file = 0;
  35 my $show_types = 0;
  36 my $fix = 0;
  37 my $fix_inplace = 0;
  38 my $root;
  39 my %debug;
  40 my %camelcase = ();
  41 my %use_type = ();
  42 my @use = ();
  43 my %ignore_type = ();
  44 my @ignore = ();
  45 my $help = 0;
  46 my $configuration_file = ".checkpatch.conf";
  47 my $max_line_length = 80;
  48 my $ignore_perl_version = 0;
  49 my $minimum_perl_version = 5.10.0;
  50 my $min_conf_desc_length = 4;
  51 my $spelling_file = "$D/spelling.txt";
  52 my $codespell = 0;
  53 my $codespellfile = "/usr/share/codespell/dictionary.txt";
  54 my $color = 1;
  55
  56 sub help {
  57         my ($exitcode) = @_;
  58
  59         print << "EOM";
  60 Usage: $P [OPTION]... [FILE]...
  61 Version: $V
  62
  63 Options:
  64   -q, --quiet                quiet
  65   --no-tree                  run without a kernel tree
  66   --no-signoff               do not check for 'Signed-off-by' line
  67   --patch                    treat FILE as patchfile (default)
  68   --emacs                    emacs compile window format
  69   --terse                    one line per report
  70   --showfile                 emit diffed file position, not input file position
  71   -f, --file                 treat FILE as regular source file
  72   --subjective, --strict     enable more subjective tests
  73   --types TYPE(,TYPE2...)    show only these comma separated message types
  74   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  75   --max-line-length=n        set the maximum line length, if exceeded, warn
  76   --min-conf-desc-length=n   set the min description length, if shorter, warn
  77   --show-types               show the message "types" in the output
  78   --root=PATH                PATH to the kernel tree root
  79   --no-summary               suppress the per-file summary
  80   --mailback                 only produce a report in case of warnings/errors
  81   --summary-file             include the filename in summary
  82   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  83                              'values', 'possible', 'type', and 'attr' (default
  84                              is all off)
  85   --test-only=WORD           report only warnings/errors containing WORD
  86                              literally
  87   --fix                      EXPERIMENTAL - may create horrible results
  88                              If correctable single-line errors exist, create
  89                              "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
  90                              with potential errors corrected to the preferred
  91                              checkpatch style
  92   --fix-inplace              EXPERIMENTAL - may create horrible results
  93                              Is the same as --fix, but overwrites the input
  94                              file.  It's your fault if there's no backup or git
  95   --ignore-perl-version      override checking of perl version.  expect
  96                              runtime errors.
  97   --codespell                Use the codespell dictionary for spelling/typos
  98                              (default:/usr/share/codespell/dictionary.txt)
  99   --codespellfile            Use this codespell dictionary
 100   --color                    Use colors when output is STDOUT (default: on)
 101   -h, --help, --version      display this help and exit
 102
 103 When FILE is - read standard input.
 104 EOM
 105
 106         exit($exitcode);
 107 }
 108
 109 my $conf = which_conf($configuration_file);
 110 if (-f $conf) {
 111         my @conf_args;
 112         open(my $conffile, '<', "$conf")
 113             or warn "$P: Can't find a readable $configuration_file file $!\n";
 114
 115         while (<$conffile>) {
 116                 my $line = $_;
 117
 118                 $line =~ s/\s*\n?$//g;
 119                 $line =~ s/^\s*//g;
 120                 $line =~ s/\s+/ /g;
 121
 122                 next if ($line =~ m/^\s*#/);
 123                 next if ($line =~ m/^\s*$/);
 124
 125                 my @words = split(" ", $line);
 126                 foreach my $word (@words) {
 127                         last if ($word =~ m/^#/);
 128                         push (@conf_args, $word);
 129                 }
 130         }
 131         close($conffile);
 132         unshift(@ARGV, @conf_args) if @conf_args;
 133 }
 134
 135 GetOptions(
 136         'q|quiet+'      => \$quiet,
 137         'tree!'         => \$tree,
 138         'signoff!'      => \$chk_signoff,
 139         'patch!'        => \$chk_patch,
 140         'emacs!'        => \$emacs,
 141         'terse!'        => \$terse,
 142         'showfile!'     => \$showfile,
 143         'f|file!'       => \$file,
 144         'subjective!'   => \$check,
 145         'strict!'       => \$check,
 146         'ignore=s'      => \@ignore,
 147         'types=s'       => \@use,
 148         'show-types!'   => \$show_types,
 149         'max-line-length=i' => \$max_line_length,
 150         'min-conf-desc-length=i' => \$min_conf_desc_length,
 151         'root=s'        => \$root,
 152         'summary!'      => \$summary,
 153         'mailback!'     => \$mailback,
 154         'summary-file!' => \$summary_file,
 155         'fix!'          => \$fix,
 156         'fix-inplace!'  => \$fix_inplace,
 157         'ignore-perl-version!' => \$ignore_perl_version,
 158         'debug=s'       => \%debug,
 159         'test-only=s'   => \$tst_only,
 160         'codespell!'    => \$codespell,
 161         'codespellfile=s'       => \$codespellfile,
 162         'color!'        => \$color,
 163         'h|help'        => \$help,
 164         'version'       => \$help
 165 ) or help(1);
 166
 167 help(0) if ($help);
 168
 169 $fix = 1 if ($fix_inplace);
 170 $check_orig = $check;
 171
 172 my $exit = 0;
 173
 174 if ($^V && $^V lt $minimum_perl_version) {
 175         printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
 176         if (!$ignore_perl_version) {
 177                 exit(1);
 178         }
 179 }
 180
 181 if ($#ARGV < 0) {
 182         print "$P: no input files\n";
 183         exit(1);
 184 }
 185
 186 sub hash_save_array_words {
 187         my ($hashRef, $arrayRef) = @_;
 188
 189         my @array = split(/,/, join(',', @$arrayRef));
 190         foreach my $word (@array) {
 191                 $word =~ s/\s*\n?$//g;
 192                 $word =~ s/^\s*//g;
 193                 $word =~ s/\s+/ /g;
 194                 $word =~ tr/[a-z]/[A-Z]/;
 195
 196                 next if ($word =~ m/^\s*#/);
 197                 next if ($word =~ m/^\s*$/);
 198
 199                 $hashRef->{$word}++;
 200         }
 201 }
 202
 203 sub hash_show_words {
 204         my ($hashRef, $prefix) = @_;
 205
 206         if (keys %$hashRef) {
 207                 print "\nNOTE: $prefix message types:";
 208                 foreach my $word (sort keys %$hashRef) {
 209                         print " $word";
 210                 }
 211                 print "\n";
 212         }
 213 }
 214
 215 hash_save_array_words(\%ignore_type, \@ignore);
 216 hash_save_array_words(\%use_type, \@use);
 217
 218 my $dbg_values = 0;
 219 my $dbg_possible = 0;
 220 my $dbg_type = 0;
 221 my $dbg_attr = 0;
 222 for my $key (keys %debug) {
 223         ## no critic
 224         eval "\${dbg_$key} = '$debug{$key}';";
 225         die "$@" if ($@);
 226 }
 227
 228 my $rpt_cleaners = 0;
 229
 230 if ($terse) {
 231         $emacs = 1;
 232         $quiet++;
 233 }
 234
 235 if ($tree) {
 236         if (defined $root) {
 237                 if (!top_of_kernel_tree($root)) {
 238                         die "$P: $root: --root does not point at a valid tree\n";
 239                 }
 240         } else {
 241                 if (top_of_kernel_tree('.')) {
 242                         $root = '.';
 243                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 244                                                 top_of_kernel_tree($1)) {
 245                         $root = $1;
 246                 }
 247         }
 248
 249         if (!defined $root) {
 250                 print "Must be run from the top-level dir. of a kernel tree\n";
 251                 exit(2);
 252         }
 253 }
 254
 255 my $emitted_corrupt = 0;
 256
 257 our $Ident      = qr{
 258                         [A-Za-z_][A-Za-z\d_]*
 259                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 260                 }x;
 261 our $Storage    = qr{extern|static|asmlinkage};
 262 our $Sparse     = qr{
 263                         __user|
 264                         __kernel|
 265                         __force|
 266                         __iomem|
 267                         __must_check|
 268                         __init_refok|
 269                         __kprobes|
 270                         __ref|
 271                         __rcu
 272                 }x;
 273 our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
 274 our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
 275 our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
 276 our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
 277 our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};
 278
 279 # Notes to $Attribute:
 280 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 281 our $Attribute  = qr{
 282                         const|
 283                         __percpu|
 284                         __nocast|
 285                         __safe|
 286                         __bitwise__|
 287                         __packed__|
 288                         __packed2__|
 289                         __naked|
 290                         __maybe_unused|
 291                         __always_unused|
 292                         __noreturn|
 293                         __used|
 294                         __cold|
 295                         __pure|
 296                         __noclone|
 297                         __deprecated|
 298                         __read_mostly|
 299                         __kprobes|
 300                         $InitAttribute|
 301                         ____cacheline_aligned|
 302                         ____cacheline_aligned_in_smp|
 303                         ____cacheline_internodealigned_in_smp|
 304                         __weak
 305                   }x;
 306 our $Modifier;
 307 our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
 308 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 309 our $Lval       = qr{$Ident(?:$Member)*};
 310
 311 our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
 312 our $Binary     = qr{(?i)0b[01]+$Int_type?};
 313 our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
 314 our $Int        = qr{[0-9]+$Int_type?};
 315 our $Octal      = qr{0[0-7]+$Int_type?};
 316 our $String     = qr{"[X\t]*"};
 317 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 318 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 319 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 320 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 321 our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
 322 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 323 our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
 324 our $Arithmetic = qr{\+|-|\*|\/|%};
 325 our $Operators  = qr{
 326                         <=|>=|==|!=|
 327                         =>|->|<<|>>|<|>|!|~|
 328                         &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
 329                   }x;
 330
 331 our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
 332
 333 our $BasicType;
 334 our $NonptrType;
 335 our $NonptrTypeMisordered;
 336 our $NonptrTypeWithAttr;
 337 our $Type;
 338 our $TypeMisordered;
 339 our $Declare;
 340 our $DeclareMisordered;
 341
 342 our $NON_ASCII_UTF8     = qr{
 343         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 344         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 345         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 346         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 347         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 348         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 349         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 350 }x;
 351
 352 our $UTF8       = qr{
 353         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 354         | $NON_ASCII_UTF8
 355 }x;
 356
 357 our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
 358 our $typeOtherOSTypedefs = qr{(?x:
 359         u_(?:char|short|int|long) |          # bsd
 360         u(?:nchar|short|int|long)            # sysv
 361 )};
 362 our $typeKernelTypedefs = qr{(?x:
 363         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 364         atomic_t
 365 )};
 366 our $typeTypedefs = qr{(?x:
 367         $typeC99Typedefs\b|
 368         $typeOtherOSTypedefs\b|
 369         $typeKernelTypedefs\b
 370 )};
 371
 372 our $logFunctions = qr{(?x:
 373         printk(?:_ratelimited|_once|)|
 374         (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 375         WARN(?:_RATELIMIT|_ONCE|)|
 376         panic|
 377         MODULE_[A-Z_]+|
 378         seq_vprintf|seq_printf|seq_puts
 379 )};
 380
 381 our $signature_tags = qr{(?xi:
 382         Signed-off-by:|
 383         Acked-by:|
 384         Tested-by:|
 385         Reviewed-by:|
 386         Reported-by:|
 387         Suggested-by:|
 388         To:|
 389         Cc:
 390 )};
 391
 392 our @typeListMisordered = (
 393         qr{char\s+(?:un)?signed},
 394         qr{int\s+(?:(?:un)?signed\s+)?short\s},
 395         qr{int\s+short(?:\s+(?:un)?signed)},
 396         qr{short\s+int(?:\s+(?:un)?signed)},
 397         qr{(?:un)?signed\s+int\s+short},
 398         qr{short\s+(?:un)?signed},
 399         qr{long\s+int\s+(?:un)?signed},
 400         qr{int\s+long\s+(?:un)?signed},
 401         qr{long\s+(?:un)?signed\s+int},
 402         qr{int\s+(?:un)?signed\s+long},
 403         qr{int\s+(?:un)?signed},
 404         qr{int\s+long\s+long\s+(?:un)?signed},
 405         qr{long\s+long\s+int\s+(?:un)?signed},
 406         qr{long\s+long\s+(?:un)?signed\s+int},
 407         qr{long\s+long\s+(?:un)?signed},
 408         qr{long\s+(?:un)?signed},
 409 );
 410
 411 our @typeList = (
 412         qr{void},
 413         qr{(?:(?:un)?signed\s+)?char},
 414         qr{(?:(?:un)?signed\s+)?short\s+int},
 415         qr{(?:(?:un)?signed\s+)?short},
 416         qr{(?:(?:un)?signed\s+)?int},
 417         qr{(?:(?:un)?signed\s+)?long\s+int},
 418         qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
 419         qr{(?:(?:un)?signed\s+)?long\s+long},
 420         qr{(?:(?:un)?signed\s+)?long},
 421         qr{(?:un)?signed},
 422         qr{float},
 423         qr{double},
 424         qr{bool},
 425         qr{struct\s+$Ident},
 426         qr{union\s+$Ident},
 427         qr{enum\s+$Ident},
 428         qr{${Ident}_t},
 429         qr{${Ident}_handler},
 430         qr{${Ident}_handler_fn},
 431         @typeListMisordered,
 432 );
 433 our @typeListFile = ();
 434 our @typeListWithAttr = (
 435         @typeList,
 436         qr{struct\s+$InitAttribute\s+$Ident},
 437         qr{union\s+$InitAttribute\s+$Ident},
 438 );
 439
 440 our @modifierList = (
 441         qr{fastcall},
 442 );
 443 our @modifierListFile = ();
 444
 445 our @mode_permission_funcs = (
 446         ["module_param", 3],
 447         ["module_param_(?:array|named|string)", 4],
 448         ["module_param_array_named", 5],
 449         ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
 450         ["proc_create(?:_data|)", 2],
 451         ["(?:CLASS|DEVICE|SENSOR)_ATTR", 2],
 452 );
 453
 454 #Create a search pattern for all these functions to speed up a loop below
 455 our $mode_perms_search = "";
 456 foreach my $entry (@mode_permission_funcs) {
 457         $mode_perms_search .= '|' if ($mode_perms_search ne "");
 458         $mode_perms_search .= $entry->[0];
 459 }
 460
 461 our $mode_perms_world_writable = qr{
 462         S_IWUGO         |
 463         S_IWOTH         |
 464         S_IRWXUGO       |
 465         S_IALLUGO       |
 466         0[0-7][0-7][2367]
 467 }x;
 468
 469 our $allowed_asm_includes = qr{(?x:
 470         irq|
 471         memory|
 472         time|
 473         reboot
 474 )};
 475 # memory.h: ARM has a custom one
 476
 477 # Load common spelling mistakes and build regular expression list.
 478 my $misspellings;
 479 my %spelling_fix;
 480
 481 if (open(my $spelling, '<', $spelling_file)) {
 482         while (<$spelling>) {
 483                 my $line = $_;
 484
 485                 $line =~ s/\s*\n?$//g;
 486                 $line =~ s/^\s*//g;
 487
 488                 next if ($line =~ m/^\s*#/);
 489                 next if ($line =~ m/^\s*$/);
 490
 491                 my ($suspect, $fix) = split(/\|\|/, $line);
 492
 493                 $spelling_fix{$suspect} = $fix;
 494         }
 495         close($spelling);
 496 } else {
 497         warn "No typos will be found - file '$spelling_file': $!\n";
 498 }
 499
 500 if ($codespell) {
 501         if (open(my $spelling, '<', $codespellfile)) {
 502                 while (<$spelling>) {
 503                         my $line = $_;
 504
 505                         $line =~ s/\s*\n?$//g;
 506                         $line =~ s/^\s*//g;
 507
 508                         next if ($line =~ m/^\s*#/);
 509                         next if ($line =~ m/^\s*$/);
 510                         next if ($line =~ m/, disabled/i);
 511
 512                         $line =~ s/,.*$//;
 513
 514                         my ($suspect, $fix) = split(/->/, $line);
 515
 516                         $spelling_fix{$suspect} = $fix;
 517                 }
 518                 close($spelling);
 519         } else {
 520                 warn "No codespell typos will be found - file '$codespellfile': $!\n";
 521         }
 522 }
 523
 524 $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
 525
 526 sub build_types {
 527         my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
 528         my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
 529         my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
 530         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
 531         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 532         $BasicType      = qr{
 533                                 (?:$typeTypedefs\b)|
 534                                 (?:${all}\b)
 535                 }x;
 536         $NonptrType     = qr{
 537                         (?:$Modifier\s+|const\s+)*
 538                         (?:
 539                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 540                                 (?:$typeTypedefs\b)|
 541                                 (?:${all}\b)
 542                         )
 543                         (?:\s+$Modifier|\s+const)*
 544                   }x;
 545         $NonptrTypeMisordered   = qr{
 546                         (?:$Modifier\s+|const\s+)*
 547                         (?:
 548                                 (?:${Misordered}\b)
 549                         )
 550                         (?:\s+$Modifier|\s+const)*
 551                   }x;
 552         $NonptrTypeWithAttr     = qr{
 553                         (?:$Modifier\s+|const\s+)*
 554                         (?:
 555                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
 556                                 (?:$typeTypedefs\b)|
 557                                 (?:${allWithAttr}\b)
 558                         )
 559                         (?:\s+$Modifier|\s+const)*
 560                   }x;
 561         $Type   = qr{
 562                         $NonptrType
 563                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 564                         (?:\s+$Inline|\s+$Modifier)*
 565                   }x;
 566         $TypeMisordered = qr{
 567                         $NonptrTypeMisordered
 568                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
 569                         (?:\s+$Inline|\s+$Modifier)*
 570                   }x;
 571         $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
 572         $DeclareMisordered      = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
 573 }
 574 build_types();
 575
 576 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 577
 578 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
 579 # requires at least perl version v5.10.0
 580 # Any use must be runtime checked with $^V
 581
 582 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 583 our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
 584 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
 585
 586 our $declaration_macros = qr{(?x:
 587         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,2}\s*\(|
 588         (?:$Storage\s+)?LIST_HEAD\s*\(|
 589         (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(
 590 )};
 591
 592 sub deparenthesize {
 593         my ($string) = @_;
 594         return "" if (!defined($string));
 595
 596         while ($string =~ /^\s*\(.*\)\s*$/) {
 597                 $string =~ s@^\s*\(\s*@@;
 598                 $string =~ s@\s*\)\s*$@@;
 599         }
 600
 601         $string =~ s@\s+@ @g;
 602
 603         return $string;
 604 }
 605
 606 sub seed_camelcase_file {
 607         my ($file) = @_;
 608
 609         return if (!(-f $file));
 610
 611         local $/;
 612
 613         open(my $include_file, '<', "$file")
 614             or warn "$P: Can't read '$file' $!\n";
 615         my $text = <$include_file>;
 616         close($include_file);
 617
 618         my @lines = split('\n', $text);
 619
 620         foreach my $line (@lines) {
 621                 next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
 622                 if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
 623                         $camelcase{$1} = 1;
 624                 } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
 625                         $camelcase{$1} = 1;
 626                 } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
 627                         $camelcase{$1} = 1;
 628                 }
 629         }
 630 }
 631
 632 my $camelcase_seeded = 0;
 633 sub seed_camelcase_includes {
 634         return if ($camelcase_seeded);
 635
 636         my $files;
 637         my $camelcase_cache = "";
 638         my @include_files = ();
 639
 640         $camelcase_seeded = 1;
 641
 642         if (-e ".git") {
 643                 my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
 644                 chomp $git_last_include_commit;
 645                 $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
 646         } else {
 647                 my $last_mod_date = 0;
 648                 $files = `find $root/include -name "*.h"`;
 649                 @include_files = split('\n', $files);
 650                 foreach my $file (@include_files) {
 651                         my $date = POSIX::strftime("%Y%m%d%H%M",
 652                                                    localtime((stat $file)[9]));
 653                         $last_mod_date = $date if ($last_mod_date < $date);
 654                 }
 655                 $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
 656         }
 657
 658         if ($camelcase_cache ne "" && -f $camelcase_cache) {
 659                 open(my $camelcase_file, '<', "$camelcase_cache")
 660                     or warn "$P: Can't read '$camelcase_cache' $!\n";
 661                 while (<$camelcase_file>) {
 662                         chomp;
 663                         $camelcase{$_} = 1;
 664                 }
 665                 close($camelcase_file);
 666
 667                 return;
 668         }
 669
 670         if (-e ".git") {
 671                 $files = `git ls-files "include/*.h"`;
 672                 @include_files = split('\n', $files);
 673         }
 674
 675         foreach my $file (@include_files) {
 676                 seed_camelcase_file($file);
 677         }
 678
 679         if ($camelcase_cache ne "") {
 680                 unlink glob ".checkpatch-camelcase.*";
 681                 open(my $camelcase_file, '>', "$camelcase_cache")
 682                     or warn "$P: Can't write '$camelcase_cache' $!\n";
 683                 foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
 684                         print $camelcase_file ("$_\n");
 685                 }
 686                 close($camelcase_file);
 687         }
 688 }
 689
 690 sub git_commit_info {
 691         my ($commit, $id, $desc) = @_;
 692
 693         return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
 694
 695         my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
 696         $output =~ s/^\s*//gm;
 697         my @lines = split("\n", $output);
 698
 699         return ($id, $desc) if ($#lines < 0);
 700
 701         if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
 702 # Maybe one day convert this block of bash into something that returns
 703 # all matching commit ids, but it's very slow...
 704 #
 705 #               echo "checking commits $1..."
 706 #               git rev-list --remotes | grep -i "^$1" |
 707 #               while read line ; do
 708 #                   git log --format='%H %s' -1 $line |
 709 #                   echo "commit $(cut -c 1-12,41-)"
 710 #               done
 711         } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
 712         } else {
 713                 $id = substr($lines[0], 0, 12);
 714                 $desc = substr($lines[0], 41);
 715         }
 716
 717         return ($id, $desc);
 718 }
 719
 720 $chk_signoff = 0 if ($file);
 721
 722 my @rawlines = ();
 723 my @lines = ();
 724 my @fixed = ();
 725 my @fixed_inserted = ();
 726 my @fixed_deleted = ();
 727 my $fixlinenr = -1;
 728
 729 my $vname;
 730 for my $filename (@ARGV) {
 731         my $FILE;
 732         if ($file) {
 733                 open($FILE, '-|', "diff -u /dev/null $filename") ||
 734                         die "$P: $filename: diff failed - $!\n";
 735         } elsif ($filename eq '-') {
 736                 open($FILE, '<&STDIN');
 737         } else {
 738                 open($FILE, '<', "$filename") ||
 739                         die "$P: $filename: open failed - $!\n";
 740         }
 741         if ($filename eq '-') {
 742                 $vname = 'Your patch';
 743         } else {
 744                 $vname = $filename;
 745         }
 746         while (<$FILE>) {
 747                 chomp;
 748                 push(@rawlines, $_);
 749         }
 750         close($FILE);
 751
 752         if ($#ARGV > 0 && $quiet == 0) {
 753                 print '-' x length($vname) . "\n";
 754                 print "$vname\n";
 755                 print '-' x length($vname) . "\n";
 756         }
 757
 758         if (!process($filename)) {
 759                 $exit = 1;
 760         }
 761         @rawlines = ();
 762         @lines = ();
 763         @fixed = ();
 764         @fixed_inserted = ();
 765         @fixed_deleted = ();
 766         $fixlinenr = -1;
 767         @modifierListFile = ();
 768         @typeListFile = ();
 769         build_types();
 770 }
 771
 772 if (!$quiet) {
 773         hash_show_words(\%use_type, "Used");
 774         hash_show_words(\%ignore_type, "Ignored");
 775
 776         if ($^V lt 5.10.0) {
 777                 print << "EOM"
 778
 779 NOTE: perl $^V is not modern enough to detect all possible issues.
 780       An upgrade to at least perl v5.10.0 is suggested.
 781 EOM
 782         }
 783         if ($exit) {
 784                 print << "EOM"
 785
 786 NOTE: If any of the errors are false positives, please report
 787       them to the maintainer, see CHECKPATCH in MAINTAINERS.
 788 EOM
 789         }
 790 }
 791
 792 exit($exit);
 793
 794 sub top_of_kernel_tree {
 795         my ($root) = @_;
 796
 797         my @tree_check = (
 798                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 799                 "README", "Documentation", "arch", "include", "drivers",
 800                 "fs", "init", "ipc", "kernel", "lib", "scripts",
 801         );
 802
 803         foreach my $check (@tree_check) {
 804                 if (! -e $root . '/' . $check) {
 805                         return 0;
 806                 }
 807         }
 808         return 1;
 809 }
 810
 811 sub parse_email {
 812         my ($formatted_email) = @_;
 813
 814         my $name = "";
 815         my $address = "";
 816         my $comment = "";
 817
 818         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 819                 $name = $1;
 820                 $address = $2;
 821                 $comment = $3 if defined $3;
 822         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 823                 $address = $1;
 824                 $comment = $2 if defined $2;
 825         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 826                 $address = $1;
 827                 $comment = $2 if defined $2;
 828                 $formatted_email =~ s/$address.*$//;
 829                 $name = $formatted_email;
 830                 $name = trim($name);
 831                 $name =~ s/^\"|\"$//g;
 832                 # If there's a name left after stripping spaces and
 833                 # leading quotes, and the address doesn't have both
 834                 # leading and trailing angle brackets, the address
 835                 # is invalid. ie:
 836                 #   "joe smith joe@smith.com" bad
 837                 #   "joe smith <joe@smith.com" bad
 838                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
 839                         $name = "";
 840                         $address = "";
 841                         $comment = "";
 842                 }
 843         }
 844
 845         $name = trim($name);
 846         $name =~ s/^\"|\"$//g;
 847         $address = trim($address);
 848         $address =~ s/^\<|\>$//g;
 849
 850         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 851                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 852                 $name = "\"$name\"";
 853         }
 854
 855         return ($name, $address, $comment);
 856 }
 857
 858 sub format_email {
 859         my ($name, $address) = @_;
 860
 861         my $formatted_email;
 862
 863         $name = trim($name);
 864         $name =~ s/^\"|\"$//g;
 865         $address = trim($address);
 866
 867         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 868                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 869                 $name = "\"$name\"";
 870         }
 871
 872         if ("$name" eq "") {
 873                 $formatted_email = "$address";
 874         } else {
 875                 $formatted_email = "$name <$address>";
 876         }
 877
 878         return $formatted_email;
 879 }
 880
 881 sub which {
 882         my ($bin) = @_;
 883
 884         foreach my $path (split(/:/, $ENV{PATH})) {
 885                 if (-e "$path/$bin") {
 886                         return "$path/$bin";
 887                 }
 888         }
 889
 890         return "";
 891 }
 892
 893 sub which_conf {
 894         my ($conf) = @_;
 895
 896         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 897                 if (-e "$path/$conf") {
 898                         return "$path/$conf";
 899                 }
 900         }
 901
 902         return "";
 903 }
 904
 905 sub expand_tabs {
 906         my ($str) = @_;
 907
 908         my $res = '';
 909         my $n = 0;
 910         for my $c (split(//, $str)) {
 911                 if ($c eq "\t") {
 912                         $res .= ' ';
 913                         $n++;
 914                         for (; ($n % 8) != 0; $n++) {
 915                                 $res .= ' ';
 916                         }
 917                         next;
 918                 }
 919                 $res .= $c;
 920                 $n++;
 921         }
 922
 923         return $res;
 924 }
 925 sub copy_spacing {
 926         (my $res = shift) =~ tr/\t/ /c;
 927         return $res;
 928 }
 929
 930 sub line_stats {
 931         my ($line) = @_;
 932
 933         # Drop the diff line leader and expand tabs
 934         $line =~ s/^.//;
 935         $line = expand_tabs($line);
 936
 937         # Pick the indent from the front of the line.
 938         my ($white) = ($line =~ /^(\s*)/);
 939
 940         return (length($line), length($white));
 941 }
 942
 943 my $sanitise_quote = '';
 944
 945 sub sanitise_line_reset {
 946         my ($in_comment) = @_;
 947
 948         if ($in_comment) {
 949                 $sanitise_quote = '*/';
 950         } else {
 951                 $sanitise_quote = '';
 952         }
 953 }
 954 sub sanitise_line {
 955         my ($line) = @_;
 956
 957         my $res = '';
 958         my $l = '';
 959
 960         my $qlen = 0;
 961         my $off = 0;
 962         my $c;
 963
 964         # Always copy over the diff marker.
 965         $res = substr($line, 0, 1);
 966
 967         for ($off = 1; $off < length($line); $off++) {
 968                 $c = substr($line, $off, 1);
 969
 970                 # Comments we are wacking completly including the begin
 971                 # and end, all to $;.
 972                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 973                         $sanitise_quote = '*/';
 974
 975                         substr($res, $off, 2, "$;$;");
 976                         $off++;
 977                         next;
 978                 }
 979                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 980                         $sanitise_quote = '';
 981                         substr($res, $off, 2, "$;$;");
 982                         $off++;
 983                         next;
 984                 }
 985                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 986                         $sanitise_quote = '//';
 987
 988                         substr($res, $off, 2, $sanitise_quote);
 989                         $off++;
 990                         next;
 991                 }
 992
 993                 # A \ in a string means ignore the next character.
 994                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 995                     $c eq "\\") {
 996                         substr($res, $off, 2, 'XX');
 997                         $off++;
 998                         next;
 999                 }
1000                 # Regular quotes.
1001                 if ($c eq "'" || $c eq '"') {
1002                         if ($sanitise_quote eq '') {
1003                                 $sanitise_quote = $c;
1004
1005                                 substr($res, $off, 1, $c);
1006                                 next;
1007                         } elsif ($sanitise_quote eq $c) {
1008                                 $sanitise_quote = '';
1009                         }
1010                 }
1011
1012                 #print "c<$c> SQ<$sanitise_quote>\n";
1013                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
1014                         substr($res, $off, 1, $;);
1015                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
1016                         substr($res, $off, 1, $;);
1017                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
1018                         substr($res, $off, 1, 'X');
1019                 } else {
1020                         substr($res, $off, 1, $c);
1021                 }
1022         }
1023
1024         if ($sanitise_quote eq '//') {
1025                 $sanitise_quote = '';
1026         }
1027
1028         # The pathname on a #include may be surrounded by '<' and '>'.
1029         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
1030                 my $clean = 'X' x length($1);
1031                 $res =~ s@\<.*\>@<$clean>@;
1032
1033         # The whole of a #error is a string.
1034         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
1035                 my $clean = 'X' x length($1);
1036                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
1037         }
1038
1039         return $res;
1040 }
1041
1042 sub get_quoted_string {
1043         my ($line, $rawline) = @_;
1044
1045         return "" if ($line !~ m/($String)/g);
1046         return substr($rawline, $-[0], $+[0] - $-[0]);
1047 }
1048
1049 sub ctx_statement_block {
1050         my ($linenr, $remain, $off) = @_;
1051         my $line = $linenr - 1;
1052         my $blk = '';
1053         my $soff = $off;
1054         my $coff = $off - 1;
1055         my $coff_set = 0;
1056
1057         my $loff = 0;
1058
1059         my $type = '';
1060         my $level = 0;
1061         my @stack = ();
1062         my $p;
1063         my $c;
1064         my $len = 0;
1065
1066         my $remainder;
1067         while (1) {
1068                 @stack = (['', 0]) if ($#stack == -1);
1069
1070                 #warn "CSB: blk<$blk> remain<$remain>\n";
1071                 # If we are about to drop off the end, pull in more
1072                 # context.
1073                 if ($off >= $len) {
1074                         for (; $remain > 0; $line++) {
1075                                 last if (!defined $lines[$line]);
1076                                 next if ($lines[$line] =~ /^-/);
1077                                 $remain--;
1078                                 $loff = $len;
1079                                 $blk .= $lines[$line] . "\n";
1080                                 $len = length($blk);
1081                                 $line++;
1082                                 last;
1083                         }
1084                         # Bail if there is no further context.
1085                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
1086                         if ($off >= $len) {
1087                                 last;
1088                         }
1089                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
1090                                 $level++;
1091                                 $type = '#';
1092                         }
1093                 }
1094                 $p = $c;
1095                 $c = substr($blk, $off, 1);
1096                 $remainder = substr($blk, $off);
1097
1098                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
1099
1100                 # Handle nested #if/#else.
1101                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
1102                         push(@stack, [ $type, $level ]);
1103                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
1104                         ($type, $level) = @{$stack[$#stack - 1]};
1105                 } elsif ($remainder =~ /^#\s*endif\b/) {
1106                         ($type, $level) = @{pop(@stack)};
1107                 }
1108
1109                 # Statement ends at the ';' or a close '}' at the
1110                 # outermost level.
1111                 if ($level == 0 && $c eq ';') {
1112                         last;
1113                 }
1114
1115                 # An else is really a conditional as long as its not else if
1116                 if ($level == 0 && $coff_set == 0 &&
1117                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
1118                                 $remainder =~ /^(else)(?:\s|{)/ &&
1119                                 $remainder !~ /^else\s+if\b/) {
1120                         $coff = $off + length($1) - 1;
1121                         $coff_set = 1;
1122                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
1123                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
1124                 }
1125
1126                 if (($type eq '' || $type eq '(') && $c eq '(') {
1127                         $level++;
1128                         $type = '(';
1129                 }
1130                 if ($type eq '(' && $c eq ')') {
1131                         $level--;
1132                         $type = ($level != 0)? '(' : '';
1133
1134                         if ($level == 0 && $coff < $soff) {
1135                                 $coff = $off;
1136                                 $coff_set = 1;
1137                                 #warn "CSB: mark coff<$coff>\n";
1138                         }
1139                 }
1140                 if (($type eq '' || $type eq '{') && $c eq '{') {
1141                         $level++;
1142                         $type = '{';
1143                 }
1144                 if ($type eq '{' && $c eq '}') {
1145                         $level--;
1146                         $type = ($level != 0)? '{' : '';
1147
1148                         if ($level == 0) {
1149                                 if (substr($blk, $off + 1, 1) eq ';') {
1150                                         $off++;
1151                                 }
1152                                 last;
1153                         }
1154                 }
1155                 # Preprocessor commands end at the newline unless escaped.
1156                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
1157                         $level--;
1158                         $type = '';
1159                         $off++;
1160                         last;
1161                 }
1162                 $off++;
1163         }
1164         # We are truly at the end, so shuffle to the next line.
1165         if ($off == $len) {
1166                 $loff = $len + 1;
1167                 $line++;
1168                 $remain--;
1169         }
1170
1171         my $statement = substr($blk, $soff, $off - $soff + 1);
1172         my $condition = substr($blk, $soff, $coff - $soff + 1);
1173
1174         #warn "STATEMENT<$statement>\n";
1175         #warn "CONDITION<$condition>\n";
1176
1177         #print "coff<$coff> soff<$off> loff<$loff>\n";
1178
1179         return ($statement, $condition,
1180                         $line, $remain + 1, $off - $loff + 1, $level);
1181 }
1182
1183 sub statement_lines {
1184         my ($stmt) = @_;
1185
1186         # Strip the diff line prefixes and rip blank lines at start and end.
1187         $stmt =~ s/(^|\n)./$1/g;
1188         $stmt =~ s/^\s*//;
1189         $stmt =~ s/\s*$//;
1190
1191         my @stmt_lines = ($stmt =~ /\n/g);
1192
1193         return $#stmt_lines + 2;
1194 }
1195
1196 sub statement_rawlines {
1197         my ($stmt) = @_;
1198
1199         my @stmt_lines = ($stmt =~ /\n/g);
1200
1201         return $#stmt_lines + 2;
1202 }
1203
1204 sub statement_block_size {
1205         my ($stmt) = @_;
1206
1207         $stmt =~ s/(^|\n)./$1/g;
1208         $stmt =~ s/^\s*{//;
1209         $stmt =~ s/}\s*$//;
1210         $stmt =~ s/^\s*//;
1211         $stmt =~ s/\s*$//;
1212
1213         my @stmt_lines = ($stmt =~ /\n/g);
1214         my @stmt_statements = ($stmt =~ /;/g);
1215
1216         my $stmt_lines = $#stmt_lines + 2;
1217         my $stmt_statements = $#stmt_statements + 1;
1218
1219         if ($stmt_lines > $stmt_statements) {
1220                 return $stmt_lines;
1221         } else {
1222                 return $stmt_statements;
1223         }
1224 }
1225
1226 sub ctx_statement_full {
1227         my ($linenr, $remain, $off) = @_;
1228         my ($statement, $condition, $level);
1229
1230         my (@chunks);
1231
1232         # Grab the first conditional/block pair.
1233         ($statement, $condition, $linenr, $remain, $off, $level) =
1234                                 ctx_statement_block($linenr, $remain, $off);
1235         #print "F: c<$condition> s<$statement> remain<$remain>\n";
1236         push(@chunks, [ $condition, $statement ]);
1237         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
1238                 return ($level, $linenr, @chunks);
1239         }
1240
1241         # Pull in the following conditional/block pairs and see if they
1242         # could continue the statement.
1243         for (;;) {
1244                 ($statement, $condition, $linenr, $remain, $off, $level) =
1245                                 ctx_statement_block($linenr, $remain, $off);
1246                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
1247                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
1248                 #print "C: push\n";
1249                 push(@chunks, [ $condition, $statement ]);
1250         }
1251
1252         return ($level, $linenr, @chunks);
1253 }
1254
1255 sub ctx_block_get {
1256         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
1257         my $line;
1258         my $start = $linenr - 1;
1259         my $blk = '';
1260         my @o;
1261         my @c;
1262         my @res = ();
1263
1264         my $level = 0;
1265         my @stack = ($level);
1266         for ($line = $start; $remain > 0; $line++) {
1267                 next if ($rawlines[$line] =~ /^-/);
1268                 $remain--;
1269
1270                 $blk .= $rawlines[$line];
1271
1272                 # Handle nested #if/#else.
1273                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
1274                         push(@stack, $level);
1275                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
1276                         $level = $stack[$#stack - 1];
1277                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
1278                         $level = pop(@stack);
1279                 }
1280
1281                 foreach my $c (split(//, $lines[$line])) {
1282                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
1283                         if ($off > 0) {
1284                                 $off--;
1285                                 next;
1286                         }
1287
1288                         if ($c eq $close && $level > 0) {
1289                                 $level--;
1290                                 last if ($level == 0);
1291                         } elsif ($c eq $open) {
1292                                 $level++;
1293                         }
1294                 }
1295
1296                 if (!$outer || $level <= 1) {
1297                         push(@res, $rawlines[$line]);
1298                 }
1299
1300                 last if ($level == 0);
1301         }
1302
1303         return ($level, @res);
1304 }
1305 sub ctx_block_outer {
1306         my ($linenr, $remain) = @_;
1307
1308         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
1309         return @r;
1310 }
1311 sub ctx_block {
1312         my ($linenr, $remain) = @_;
1313
1314         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1315         return @r;
1316 }
1317 sub ctx_statement {
1318         my ($linenr, $remain, $off) = @_;
1319
1320         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1321         return @r;
1322 }
1323 sub ctx_block_level {
1324         my ($linenr, $remain) = @_;
1325
1326         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1327 }
1328 sub ctx_statement_level {
1329         my ($linenr, $remain, $off) = @_;
1330
1331         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1332 }
1333
1334 sub ctx_locate_comment {
1335         my ($first_line, $end_line) = @_;
1336
1337         # Catch a comment on the end of the line itself.
1338         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
1339         return $current_comment if (defined $current_comment);
1340
1341         # Look through the context and try and figure out if there is a
1342         # comment.
1343         my $in_comment = 0;
1344         $current_comment = '';
1345         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
1346                 my $line = $rawlines[$linenr - 1];
1347                 #warn "           $line\n";
1348                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
1349                         $in_comment = 1;
1350                 }
1351                 if ($line =~ m@/\*@) {
1352                         $in_comment = 1;
1353                 }
1354                 if (!$in_comment && $current_comment ne '') {
1355                         $current_comment = '';
1356                 }
1357                 $current_comment .= $line . "\n" if ($in_comment);
1358                 if ($line =~ m@\*/@) {
1359                         $in_comment = 0;
1360                 }
1361         }
1362
1363         chomp($current_comment);
1364         return($current_comment);
1365 }
1366 sub ctx_has_comment {
1367         my ($first_line, $end_line) = @_;
1368         my $cmt = ctx_locate_comment($first_line, $end_line);
1369
1370         ##print "LINE: $rawlines[$end_line - 1 ]\n";
1371         ##print "CMMT: $cmt\n";
1372
1373         return ($cmt ne '');
1374 }
1375
1376 sub raw_line {
1377         my ($linenr, $cnt) = @_;
1378
1379         my $offset = $linenr - 1;
1380         $cnt++;
1381
1382         my $line;
1383         while ($cnt) {
1384                 $line = $rawlines[$offset++];
1385                 next if (defined($line) && $line =~ /^-/);
1386                 $cnt--;
1387         }
1388
1389         return $line;
1390 }
1391
1392 sub cat_vet {
1393         my ($vet) = @_;
1394         my ($res, $coded);
1395
1396         $res = '';
1397         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
1398                 $res .= $1;
1399                 if ($2 ne '') {
1400                         $coded = sprintf("^%c", unpack('C', $2) + 64);
1401                         $res .= $coded;
1402                 }
1403         }
1404         $res =~ s/$/\$/;
1405
1406         return $res;
1407 }
1408
1409 my $av_preprocessor = 0;
1410 my $av_pending;
1411 my @av_paren_type;
1412 my $av_pend_colon;
1413
1414 sub annotate_reset {
1415         $av_preprocessor = 0;
1416         $av_pending = '_';
1417         @av_paren_type = ('E');
1418         $av_pend_colon = 'O';
1419 }
1420
1421 sub annotate_values {
1422         my ($stream, $type) = @_;
1423
1424         my $res;
1425         my $var = '_' x length($stream);
1426         my $cur = $stream;
1427
1428         print "$stream\n" if ($dbg_values > 1);
1429
1430         while (length($cur)) {
1431                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1432                 print " <" . join('', @av_paren_type) .
1433                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1434                 if ($cur =~ /^(\s+)/o) {
1435                         print "WS($1)\n" if ($dbg_values > 1);
1436                         if ($1 =~ /\n/ && $av_preprocessor) {
1437                                 $type = pop(@av_paren_type);
1438                                 $av_preprocessor = 0;
1439                         }
1440
1441                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1442                         print "CAST($1)\n" if ($dbg_values > 1);
1443                         push(@av_paren_type, $type);
1444                         $type = 'c';
1445
1446                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1447                         print "DECLARE($1)\n" if ($dbg_values > 1);
1448                         $type = 'T';
1449
1450                 } elsif ($cur =~ /^($Modifier)\s*/) {
1451                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1452                         $type = 'T';
1453
1454                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1455                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1456                         $av_preprocessor = 1;
1457                         push(@av_paren_type, $type);
1458                         if ($2 ne '') {
1459                                 $av_pending = 'N';
1460                         }
1461                         $type = 'E';
1462
1463                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1464                         print "UNDEF($1)\n" if ($dbg_values > 1);
1465                         $av_preprocessor = 1;
1466                         push(@av_paren_type, $type);
1467
1468                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1469                         print "PRE_START($1)\n" if ($dbg_values > 1);
1470                         $av_preprocessor = 1;
1471
1472                         push(@av_paren_type, $type);
1473                         push(@av_paren_type, $type);
1474                         $type = 'E';
1475
1476                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1477                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1478                         $av_preprocessor = 1;
1479
1480                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1481
1482                         $type = 'E';
1483
1484                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1485                         print "PRE_END($1)\n" if ($dbg_values > 1);
1486
1487                         $av_preprocessor = 1;
1488
1489                         # Assume all arms of the conditional end as this
1490                         # one does, and continue as if the #endif was not here.
1491                         pop(@av_paren_type);
1492                         push(@av_paren_type, $type);
1493                         $type = 'E';
1494
1495                 } elsif ($cur =~ /^(\\\n)/o) {
1496                         print "PRECONT($1)\n" if ($dbg_values > 1);
1497
1498                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1499                         print "ATTR($1)\n" if ($dbg_values > 1);
1500                         $av_pending = $type;
1501                         $type = 'N';
1502
1503                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1504                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1505                         if (defined $2) {
1506                                 $av_pending = 'V';
1507                         }
1508                         $type = 'N';
1509
1510                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1511                         print "COND($1)\n" if ($dbg_values > 1);
1512                         $av_pending = 'E';
1513                         $type = 'N';
1514
1515                 } elsif ($cur =~/^(case)/o) {
1516                         print "CASE($1)\n" if ($dbg_values > 1);
1517                         $av_pend_colon = 'C';
1518                         $type = 'N';
1519
1520                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1521                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1522                         $type = 'N';
1523
1524                 } elsif ($cur =~ /^(\()/o) {
1525                         print "PAREN('$1')\n" if ($dbg_values > 1);
1526                         push(@av_paren_type, $av_pending);
1527                         $av_pending = '_';
1528                         $type = 'N';
1529
1530                 } elsif ($cur =~ /^(\))/o) {
1531                         my $new_type = pop(@av_paren_type);
1532                         if ($new_type ne '_') {
1533                                 $type = $new_type;
1534                                 print "PAREN('$1') -> $type\n"
1535                                                         if ($dbg_values > 1);
1536                         } else {
1537                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1538                         }
1539
1540                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1541                         print "FUNC($1)\n" if ($dbg_values > 1);
1542                         $type = 'V';
1543                         $av_pending = 'V';
1544
1545                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1546                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1547                                 $av_pend_colon = 'B';
1548                         } elsif ($type eq 'E') {
1549                                 $av_pend_colon = 'L';
1550                         }
1551                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1552                         $type = 'V';
1553
1554                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1555                         print "IDENT($1)\n" if ($dbg_values > 1);
1556                         $type = 'V';
1557
1558                 } elsif ($cur =~ /^($Assignment)/o) {
1559                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1560                         $type = 'N';
1561
1562                 } elsif ($cur =~/^(;|{|})/) {
1563                         print "END($1)\n" if ($dbg_values > 1);
1564                         $type = 'E';
1565                         $av_pend_colon = 'O';
1566
1567                 } elsif ($cur =~/^(,)/) {
1568                         print "COMMA($1)\n" if ($dbg_values > 1);
1569                         $type = 'C';
1570
1571                 } elsif ($cur =~ /^(\?)/o) {
1572                         print "QUESTION($1)\n" if ($dbg_values > 1);
1573                         $type = 'N';
1574
1575                 } elsif ($cur =~ /^(:)/o) {
1576                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1577
1578                         substr($var, length($res), 1, $av_pend_colon);
1579                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1580                                 $type = 'E';
1581                         } else {
1582                                 $type = 'N';
1583                         }
1584                         $av_pend_colon = 'O';
1585
1586                 } elsif ($cur =~ /^(\[)/o) {
1587                         print "CLOSE($1)\n" if ($dbg_values > 1);
1588                         $type = 'N';
1589
1590                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1591                         my $variant;
1592
1593                         print "OPV($1)\n" if ($dbg_values > 1);
1594                         if ($type eq 'V') {
1595                                 $variant = 'B';
1596                         } else {
1597                                 $variant = 'U';
1598                         }
1599
1600                         substr($var, length($res), 1, $variant);
1601                         $type = 'N';
1602
1603                 } elsif ($cur =~ /^($Operators)/o) {
1604                         print "OP($1)\n" if ($dbg_values > 1);
1605                         if ($1 ne '++' && $1 ne '--') {
1606                                 $type = 'N';
1607                         }
1608
1609                 } elsif ($cur =~ /(^.)/o) {
1610                         print "C($1)\n" if ($dbg_values > 1);
1611                 }
1612                 if (defined $1) {
1613                         $cur = substr($cur, length($1));
1614                         $res .= $type x length($1);
1615                 }
1616         }
1617
1618         return ($res, $var);
1619 }
1620
1621 sub possible {
1622         my ($possible, $line) = @_;
1623         my $notPermitted = qr{(?:
1624                 ^(?:
1625                         $Modifier|
1626                         $Storage|
1627                         $Type|
1628                         DEFINE_\S+
1629                 )$|
1630                 ^(?:
1631                         goto|
1632                         return|
1633                         case|
1634                         else|
1635                         asm|__asm__|
1636                         do|
1637                         \#|
1638                         \#\#|
1639                 )(?:\s|$)|
1640                 ^(?:typedef|struct|enum)\b
1641             )}x;
1642         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1643         if ($possible !~ $notPermitted) {
1644                 # Check for modifiers.
1645                 $possible =~ s/\s*$Storage\s*//g;
1646                 $possible =~ s/\s*$Sparse\s*//g;
1647                 if ($possible =~ /^\s*$/) {
1648
1649                 } elsif ($possible =~ /\s/) {
1650                         $possible =~ s/\s*$Type\s*//g;
1651                         for my $modifier (split(' ', $possible)) {
1652                                 if ($modifier !~ $notPermitted) {
1653                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1654                                         push(@modifierListFile, $modifier);
1655                                 }
1656                         }
1657
1658                 } else {
1659                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1660                         push(@typeListFile, $possible);
1661                 }
1662                 build_types();
1663         } else {
1664                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1665         }
1666 }
1667
1668 my $prefix = '';
1669
1670 sub show_type {
1671         my ($type) = @_;
1672
1673         return defined $use_type{$type} if (scalar keys %use_type > 0);
1674
1675         return !defined $ignore_type{$type};
1676 }
1677
1678 sub report {
1679         my ($level, $type, $msg) = @_;
1680
1681         if (!show_type($type) ||
1682             (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
1683                 return 0;
1684         }
1685         my $output = '';
1686         if (-t STDOUT && $color) {
1687                 if ($level eq 'ERROR') {
1688                         $output .= RED;
1689                 } elsif ($level eq 'WARNING') {
1690                         $output .= YELLOW;
1691                 } else {
1692                         $output .= GREEN;
1693                 }
1694         }
1695         $output .= $prefix . $level . ':';
1696         if ($show_types) {
1697                 $output .= BLUE if (-t STDOUT && $color);
1698                 $output .= "$type:";
1699         }
1700         $output .= RESET if (-t STDOUT && $color);
1701         $output .= ' ' . $msg . "\n";
1702
1703         if ($showfile) {
1704                 my @lines = split("\n", $output, -1);
1705                 splice(@lines, 1, 1);
1706                 $output = join("\n", @lines);
1707         }
1708         $output = (split('\n', $output))[0] . "\n" if ($terse);
1709
1710         push(our @report, $output);
1711
1712         return 1;
1713 }
1714
1715 sub report_dump {
1716         our @report;
1717 }
1718
1719 sub fixup_current_range {
1720         my ($lineRef, $offset, $length) = @_;
1721
1722         if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
1723                 my $o = $1;
1724                 my $l = $2;
1725                 my $no = $o + $offset;
1726                 my $nl = $l + $length;
1727                 $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
1728         }
1729 }
1730
1731 sub fix_inserted_deleted_lines {
1732         my ($linesRef, $insertedRef, $deletedRef) = @_;
1733
1734         my $range_last_linenr = 0;
1735         my $delta_offset = 0;
1736
1737         my $old_linenr = 0;
1738         my $new_linenr = 0;
1739
1740         my $next_insert = 0;
1741         my $next_delete = 0;
1742
1743         my @lines = ();
1744
1745         my $inserted = @{$insertedRef}[$next_insert++];
1746         my $deleted = @{$deletedRef}[$next_delete++];
1747
1748         foreach my $old_line (@{$linesRef}) {
1749                 my $save_line = 1;
1750                 my $line = $old_line;   #don't modify the array
1751                 if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {      #new filename
1752                         $delta_offset = 0;
1753                 } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {    #new hunk
1754                         $range_last_linenr = $new_linenr;
1755                         fixup_current_range(\$line, $delta_offset, 0);
1756                 }
1757
1758                 while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
1759                         $deleted = @{$deletedRef}[$next_delete++];
1760                         $save_line = 0;
1761                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
1762                 }
1763
1764                 while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
1765                         push(@lines, ${$inserted}{'LINE'});
1766                         $inserted = @{$insertedRef}[$next_insert++];
1767                         $new_linenr++;
1768                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
1769                 }
1770
1771                 if ($save_line) {
1772                         push(@lines, $line);
1773                         $new_linenr++;
1774                 }
1775
1776                 $old_linenr++;
1777         }
1778
1779         return @lines;
1780 }
1781
1782 sub fix_insert_line {
1783         my ($linenr, $line) = @_;
1784
1785         my $inserted = {
1786                 LINENR => $linenr,
1787                 LINE => $line,
1788         };
1789         push(@fixed_inserted, $inserted);
1790 }
1791
1792 sub fix_delete_line {
1793         my ($linenr, $line) = @_;
1794
1795         my $deleted = {
1796                 LINENR => $linenr,
1797                 LINE => $line,
1798         };
1799
1800         push(@fixed_deleted, $deleted);
1801 }
1802
1803 sub ERROR {
1804         my ($type, $msg) = @_;
1805
1806         if (report("ERROR", $type, $msg)) {
1807                 our $clean = 0;
1808                 our $cnt_error++;
1809                 return 1;
1810         }
1811         return 0;
1812 }
1813 sub WARN {
1814         my ($type, $msg) = @_;
1815
1816         if (report("WARNING", $type, $msg)) {
1817                 our $clean = 0;
1818                 our $cnt_warn++;
1819                 return 1;
1820         }
1821         return 0;
1822 }
1823 sub CHK {
1824         my ($type, $msg) = @_;
1825
1826         if ($check && report("CHECK", $type, $msg)) {
1827                 our $clean = 0;
1828                 our $cnt_chk++;
1829                 return 1;
1830         }
1831         return 0;
1832 }
1833
1834 sub check_absolute_file {
1835         my ($absolute, $herecurr) = @_;
1836         my $file = $absolute;
1837
1838         ##print "absolute<$absolute>\n";
1839
1840         # See if any suffix of this path is a path within the tree.
1841         while ($file =~ s@^[^/]*/@@) {
1842                 if (-f "$root/$file") {
1843                         ##print "file<$file>\n";
1844                         last;
1845                 }
1846         }
1847         if (! -f _)  {
1848                 return 0;
1849         }
1850
1851         # It is, so see if the prefix is acceptable.
1852         my $prefix = $absolute;
1853         substr($prefix, -length($file)) = '';
1854
1855         ##print "prefix<$prefix>\n";
1856         if ($prefix ne ".../") {
1857                 WARN("USE_RELATIVE_PATH",
1858                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1859         }
1860 }
1861
1862 sub trim {
1863         my ($string) = @_;
1864
1865         $string =~ s/^\s+|\s+$//g;
1866
1867         return $string;
1868 }
1869
1870 sub ltrim {
1871         my ($string) = @_;
1872
1873         $string =~ s/^\s+//;
1874
1875         return $string;
1876 }
1877
1878 sub rtrim {
1879         my ($string) = @_;
1880
1881         $string =~ s/\s+$//;
1882
1883         return $string;
1884 }
1885
1886 sub string_find_replace {
1887         my ($string, $find, $replace) = @_;
1888
1889         $string =~ s/$find/$replace/g;
1890
1891         return $string;
1892 }
1893
1894 sub tabify {
1895         my ($leading) = @_;
1896
1897         my $source_indent = 8;
1898         my $max_spaces_before_tab = $source_indent - 1;
1899         my $spaces_to_tab = " " x $source_indent;
1900
1901         #convert leading spaces to tabs
1902         1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
1903         #Remove spaces before a tab
1904         1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
1905
1906         return "$leading";
1907 }
1908
1909 sub pos_last_openparen {
1910         my ($line) = @_;
1911
1912         my $pos = 0;
1913
1914         my $opens = $line =~ tr/\(/\(/;
1915         my $closes = $line =~ tr/\)/\)/;
1916
1917         my $last_openparen = 0;
1918
1919         if (($opens == 0) || ($closes >= $opens)) {
1920                 return -1;
1921         }
1922
1923         my $len = length($line);
1924
1925         for ($pos = 0; $pos < $len; $pos++) {
1926                 my $string = substr($line, $pos);
1927                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
1928                         $pos += length($1) - 1;
1929                 } elsif (substr($line, $pos, 1) eq '(') {
1930                         $last_openparen = $pos;
1931                 } elsif (index($string, '(') == -1) {
1932                         last;
1933                 }
1934         }
1935
1936         return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
1937 }
1938
1939 sub process {
1940         my $filename = shift;
1941
1942         my $linenr=0;
1943         my $prevline="";
1944         my $prevrawline="";
1945         my $stashline="";
1946         my $stashrawline="";
1947
1948         my $length;
1949         my $indent;
1950         my $previndent=0;
1951         my $stashindent=0;
1952
1953         our $clean = 1;
1954         my $signoff = 0;
1955         my $is_patch = 0;
1956
1957         my $in_header_lines = $file ? 0 : 1;
1958         my $in_commit_log = 0;          #Scanning lines before patch
1959         my $commit_log_long_line = 0;
1960         my $commit_log_has_diff = 0;
1961         my $reported_maintainer_file = 0;
1962         my $non_utf8_charset = 0;
1963
1964         my $last_blank_line = 0;
1965         my $last_coalesced_string_linenr = -1;
1966
1967         our @report = ();
1968         our $cnt_lines = 0;
1969         our $cnt_error = 0;
1970         our $cnt_warn = 0;
1971         our $cnt_chk = 0;
1972
1973         # Trace the real file/line as we go.
1974         my $realfile = '';
1975         my $realline = 0;
1976         my $realcnt = 0;
1977         my $here = '';
1978         my $in_comment = 0;
1979         my $comment_edge = 0;
1980         my $first_line = 0;
1981         my $p1_prefix = '';
1982
1983         my $prev_values = 'E';
1984
1985         # suppression flags
1986         my %suppress_ifbraces;
1987         my %suppress_whiletrailers;
1988         my %suppress_export;
1989         my $suppress_statement = 0;
1990
1991         my %signatures = ();
1992
1993         # Pre-scan the patch sanitizing the lines.
1994         # Pre-scan the patch looking for any __setup documentation.
1995         #
1996         my @setup_docs = ();
1997         my $setup_docs = 0;
1998
1999         my $camelcase_file_seeded = 0;
2000
2001         sanitise_line_reset();
2002         my $line;
2003         foreach my $rawline (@rawlines) {
2004                 $linenr++;
2005                 $line = $rawline;
2006
2007                 push(@fixed, $rawline) if ($fix);
2008
2009                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
2010                         $setup_docs = 0;
2011                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
2012                                 $setup_docs = 1;
2013                         }
2014                         #next;
2015                 }
2016                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
2017                         $realline=$1-1;
2018                         if (defined $2) {
2019                                 $realcnt=$3+1;
2020                         } else {
2021                                 $realcnt=1+1;
2022                         }
2023                         $in_comment = 0;
2024
2025                         # Guestimate if this is a continuing comment.  Run
2026                         # the context looking for a comment "edge".  If this
2027                         # edge is a close comment then we must be in a comment
2028                         # at context start.
2029                         my $edge;
2030                         my $cnt = $realcnt;
2031                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
2032                                 next if (defined $rawlines[$ln - 1] &&
2033                                          $rawlines[$ln - 1] =~ /^-/);
2034                                 $cnt--;
2035                                 #print "RAW<$rawlines[$ln - 1]>\n";
2036                                 last if (!defined $rawlines[$ln - 1]);
2037                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
2038                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
2039                                         ($edge) = $1;
2040                                         last;
2041                                 }
2042                         }
2043                         if (defined $edge && $edge eq '*/') {
2044                                 $in_comment = 1;
2045                         }
2046
2047                         # Guestimate if this is a continuing comment.  If this
2048                         # is the start of a diff block and this line starts
2049                         # ' *' then it is very likely a comment.
2050                         if (!defined $edge &&
2051                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
2052                         {
2053                                 $in_comment = 1;
2054                         }
2055
2056                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
2057                         sanitise_line_reset($in_comment);
2058
2059                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
2060                         # Standardise the strings and chars within the input to
2061                         # simplify matching -- only bother with positive lines.
2062                         $line = sanitise_line($rawline);
2063                 }
2064                 push(@lines, $line);
2065
2066                 if ($realcnt > 1) {
2067                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
2068                 } else {
2069                         $realcnt = 0;
2070                 }
2071
2072                 #print "==>$rawline\n";
2073                 #print "-->$line\n";
2074
2075                 if ($setup_docs && $line =~ /^\+/) {
2076                         push(@setup_docs, $line);
2077                 }
2078         }
2079
2080         $prefix = '';
2081
2082         $realcnt = 0;
2083         $linenr = 0;
2084         $fixlinenr = -1;
2085         foreach my $line (@lines) {
2086                 $linenr++;
2087                 $fixlinenr++;
2088                 my $sline = $line;      #copy of $line
2089                 $sline =~ s/$;/ /g;     #with comments as spaces
2090
2091                 my $rawline = $rawlines[$linenr - 1];
2092
2093 #extract the line range in the file after the patch is applied
2094                 if (!$in_commit_log &&
2095                     $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
2096                         $is_patch = 1;
2097                         $first_line = $linenr + 1;
2098                         $realline=$1-1;
2099                         if (defined $2) {
2100                                 $realcnt=$3+1;
2101                         } else {
2102                                 $realcnt=1+1;
2103                         }
2104                         annotate_reset();
2105                         $prev_values = 'E';
2106
2107                         %suppress_ifbraces = ();
2108                         %suppress_whiletrailers = ();
2109                         %suppress_export = ();
2110                         $suppress_statement = 0;
2111                         next;
2112
2113 # track the line number as we move through the hunk, note that
2114 # new versions of GNU diff omit the leading space on completely
2115 # blank context lines so we need to count that too.
2116                 } elsif ($line =~ /^( |\+|$)/) {
2117                         $realline++;
2118                         $realcnt-- if ($realcnt != 0);
2119
2120                         # Measure the line length and indent.
2121                         ($length, $indent) = line_stats($rawline);
2122
2123                         # Track the previous line.
2124                         ($prevline, $stashline) = ($stashline, $line);
2125                         ($previndent, $stashindent) = ($stashindent, $indent);
2126                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
2127
2128                         #warn "line<$line>\n";
2129
2130                 } elsif ($realcnt == 1) {
2131                         $realcnt--;
2132                 }
2133
2134                 my $hunk_line = ($realcnt != 0);
2135
2136                 $here = "#$linenr: " if (!$file);
2137                 $here = "#$realline: " if ($file);
2138
2139                 my $found_file = 0;
2140                 # extract the filename as it passes
2141                 if ($line =~ /^diff --git.*?(\S+)$/) {
2142                         $realfile = $1;
2143                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2144                         $in_commit_log = 0;
2145                         $found_file = 1;
2146                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
2147                         $realfile = $1;
2148                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2149                         $in_commit_log = 0;
2150
2151                         $p1_prefix = $1;
2152                         if (!$file && $tree && $p1_prefix ne '' &&
2153                             -e "$root/$p1_prefix") {
2154                                 WARN("PATCH_PREFIX",
2155                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
2156                         }
2157
2158                         if ($realfile =~ m@^include/asm/@) {
2159                                 ERROR("MODIFIED_INCLUDE_ASM",
2160                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
2161                         }
2162                         $found_file = 1;
2163                 }
2164
2165 #make up the handle for any error we report on this line
2166                 if ($showfile) {
2167                         $prefix = "$realfile:$realline: "
2168                 } elsif ($emacs) {
2169                         $prefix = "$filename:$linenr: ";
2170                 }
2171
2172                 if ($found_file) {
2173                         if ($realfile =~ m@^(drivers/net/|net/)@) {
2174                                 $check = 1;
2175                         } else {
2176                                 $check = $check_orig;
2177                         }
2178                         next;
2179                 }
2180
2181                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
2182
2183                 my $hereline = "$here\n$rawline\n";
2184                 my $herecurr = "$here\n$rawline\n";
2185                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
2186
2187                 $cnt_lines++ if ($realcnt != 0);
2188
2189 # Check if the commit log has what seems like a diff which can confuse patch
2190                 if ($in_commit_log && !$commit_log_has_diff &&
2191                     (($line =~ m@^\s+diff\b.*a/[\w/]+@ &&
2192                       $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) ||
2193                      $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
2194                      $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
2195                         ERROR("DIFF_IN_COMMIT_MSG",
2196                               "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr);
2197                         $commit_log_has_diff = 1;
2198                 }
2199
2200 # Check for incorrect file permissions
2201                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
2202                         my $permhere = $here . "FILE: $realfile\n";
2203                         if ($realfile !~ m@scripts/@ &&
2204                             $realfile !~ /\.(py|pl|awk|sh)$/) {
2205                                 ERROR("EXECUTE_PERMISSIONS",
2206                                       "do not set execute permissions for source files\n" . $permhere);
2207                         }
2208                 }
2209
2210 # Check the patch for a signoff:
2211                 if ($line =~ /^\s*signed-off-by:/i) {
2212                         $signoff++;
2213                         $in_commit_log = 0;
2214                 }
2215
2216 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
2217 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
2218                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
2219                         $reported_maintainer_file = 1;
2220                 }
2221
2222 # Check signature styles
2223                 if (!$in_header_lines &&
2224                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
2225                         my $space_before = $1;
2226                         my $sign_off = $2;
2227                         my $space_after = $3;
2228                         my $email = $4;
2229                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
2230
2231                         if ($sign_off !~ /$signature_tags/) {
2232                                 WARN("BAD_SIGN_OFF",
2233                                      "Non-standard signature: $sign_off\n" . $herecurr);
2234                         }
2235                         if (defined $space_before && $space_before ne "") {
2236                                 if (WARN("BAD_SIGN_OFF",
2237                                          "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
2238                                     $fix) {
2239                                         $fixed[$fixlinenr] =
2240                                             "$ucfirst_sign_off $email";
2241                                 }
2242                         }
2243                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
2244                                 if (WARN("BAD_SIGN_OFF",
2245                                          "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
2246                                     $fix) {
2247                                         $fixed[$fixlinenr] =
2248                                             "$ucfirst_sign_off $email";
2249                                 }
2250
2251                         }
2252                         if (!defined $space_after || $space_after ne " ") {
2253                                 if (WARN("BAD_SIGN_OFF",
2254                                          "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
2255                                     $fix) {
2256                                         $fixed[$fixlinenr] =
2257                                             "$ucfirst_sign_off $email";
2258                                 }
2259                         }
2260
2261                         my ($email_name, $email_address, $comment) = parse_email($email);
2262                         my $suggested_email = format_email(($email_name, $email_address));
2263                         if ($suggested_email eq "") {
2264                                 ERROR("BAD_SIGN_OFF",
2265                                       "Unrecognized email address: '$email'\n" . $herecurr);
2266                         } else {
2267                                 my $dequoted = $suggested_email;
2268                                 $dequoted =~ s/^"//;
2269                                 $dequoted =~ s/" </ </;
2270                                 # Don't force email to have quotes
2271                                 # Allow just an angle bracketed address
2272                                 if ("$dequoted$comment" ne $email &&
2273                                     "<$email_address>$comment" ne $email &&
2274                                     "$suggested_email$comment" ne $email) {
2275                                         WARN("BAD_SIGN_OFF",
2276                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
2277                                 }
2278                         }
2279
2280 # Check for duplicate signatures
2281                         my $sig_nospace = $line;
2282                         $sig_nospace =~ s/\s//g;
2283                         $sig_nospace = lc($sig_nospace);
2284                         if (defined $signatures{$sig_nospace}) {
2285                                 WARN("BAD_SIGN_OFF",
2286                                      "Duplicate signature\n" . $herecurr);
2287                         } else {
2288                                 $signatures{$sig_nospace} = 1;
2289                         }
2290                 }
2291
2292 # Check email subject for common tools that don't need to be mentioned
2293                 if ($in_header_lines &&
2294                     $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
2295                         WARN("EMAIL_SUBJECT",
2296                              "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
2297                 }
2298
2299 # Check for old stable address
2300                 if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
2301                         ERROR("STABLE_ADDRESS",
2302                               "The 'stable' address should be 'stable\@vger.kernel.org'\n" . $herecurr);
2303                 }
2304
2305 # Check for unwanted Gerrit info
2306                 if ($in_commit_log && $line =~ /^\s*change-id:/i) {
2307                         ERROR("GERRIT_CHANGE_ID",
2308                               "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
2309                 }
2310
2311 # Check for line lengths > 75 in commit log, warn once
2312                 if ($in_commit_log && !$commit_log_long_line &&
2313                     length($line) > 75) {
2314                         WARN("COMMIT_LOG_LONG_LINE",
2315                              "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
2316                         $commit_log_long_line = 1;
2317                 }
2318
2319 # Check for git id commit length and improperly formed commit descriptions
2320                 if ($in_commit_log && $line =~ /\b(c)ommit\s+([0-9a-f]{5,})/i) {
2321                         my $init_char = $1;
2322                         my $orig_commit = lc($2);
2323                         my $short = 1;
2324                         my $long = 0;
2325                         my $case = 1;
2326                         my $space = 1;
2327                         my $hasdesc = 0;
2328                         my $hasparens = 0;
2329                         my $id = '0123456789ab';
2330                         my $orig_desc = "commit description";
2331                         my $description = "";
2332
2333                         $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
2334                         $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
2335                         $space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
2336                         $case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
2337                         if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
2338                                 $orig_desc = $1;
2339                                 $hasparens = 1;
2340                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
2341                                  defined $rawlines[$linenr] &&
2342                                  $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
2343                                 $orig_desc = $1;
2344                                 $hasparens = 1;
2345                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
2346                                  defined $rawlines[$linenr] &&
2347                                  $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
2348                                 $line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
2349                                 $orig_desc = $1;
2350                                 $rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
2351                                 $orig_desc .= " " . $1;
2352                                 $hasparens = 1;
2353                         }
2354
2355                         ($id, $description) = git_commit_info($orig_commit,
2356                                                               $id, $orig_desc);
2357
2358                         if ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens) {
2359                                 ERROR("GIT_COMMIT_ID",
2360                                       "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
2361                         }
2362                 }
2363
2364 # Check for added, moved or deleted files
2365                 if (!$reported_maintainer_file && !$in_commit_log &&
2366                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
2367                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
2368                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
2369                       (defined($1) || defined($2))))) {
2370                         $reported_maintainer_file = 1;
2371                         WARN("FILE_PATH_CHANGES",
2372                              "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
2373                 }
2374
2375 # Check for wrappage within a valid hunk of the file
2376                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
2377                         ERROR("CORRUPTED_PATCH",
2378                               "patch seems to be corrupt (line wrapped?)\n" .
2379                                 $herecurr) if (!$emitted_corrupt++);
2380                 }
2381
2382 # Check for absolute kernel paths.
2383                 if ($tree) {
2384                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
2385                                 my $file = $1;
2386
2387                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
2388                                     check_absolute_file($1, $herecurr)) {
2389                                         #
2390                                 } else {
2391                                         check_absolute_file($file, $herecurr);
2392                                 }
2393                         }
2394                 }
2395
2396 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
2397                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
2398                     $rawline !~ m/^$UTF8*$/) {
2399                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
2400
2401                         my $blank = copy_spacing($rawline);
2402                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
2403                         my $hereptr = "$hereline$ptr\n";
2404
2405                         CHK("INVALID_UTF8",
2406                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
2407                 }
2408
2409 # Check if it's the start of a commit log
2410 # (not a header line and we haven't seen the patch filename)
2411                 if ($in_header_lines && $realfile =~ /^$/ &&
2412                     !($rawline =~ /^\s+\S/ ||
2413                       $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
2414                         $in_header_lines = 0;
2415                         $in_commit_log = 1;
2416                 }
2417
2418 # Check if there is UTF-8 in a commit log when a mail header has explicitly
2419 # declined it, i.e defined some charset where it is missing.
2420                 if ($in_header_lines &&
2421                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
2422                     $1 !~ /utf-8/i) {
2423                         $non_utf8_charset = 1;
2424                 }
2425
2426                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
2427                     $rawline =~ /$NON_ASCII_UTF8/) {
2428                         WARN("UTF8_BEFORE_PATCH",
2429                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
2430                 }
2431
2432 # Check for various typo / spelling mistakes
2433                 if (defined($misspellings) &&
2434                     ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
2435                         while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
2436                                 my $typo = $1;
2437                                 my $typo_fix = $spelling_fix{lc($typo)};
2438                                 $typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
2439                                 $typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
2440                                 my $msg_type = \&WARN;
2441                                 $msg_type = \&CHK if ($file);
2442                                 if (&{$msg_type}("TYPO_SPELLING",
2443                                                  "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
2444                                     $fix) {
2445                                         $fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
2446                                 }
2447                         }
2448                 }
2449
2450 # ignore non-hunk lines and lines being removed
2451                 next if (!$hunk_line || $line =~ /^-/);
2452
2453 #trailing whitespace
2454                 if ($line =~ /^\+.*\015/) {
2455                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2456                         if (ERROR("DOS_LINE_ENDINGS",
2457                                   "DOS line endings\n" . $herevet) &&
2458                             $fix) {
2459                                 $fixed[$fixlinenr] =~ s/[\s\015]+$//;
2460                         }
2461                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
2462                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2463                         if (ERROR("TRAILING_WHITESPACE",
2464                                   "trailing whitespace\n" . $herevet) &&
2465                             $fix) {
2466                                 $fixed[$fixlinenr] =~ s/\s+$//;
2467                         }
2468
2469                         $rpt_cleaners = 1;
2470                 }
2471
2472 # Check for FSF mailing addresses.
2473                 if ($rawline =~ /\bwrite to the Free/i ||
2474                     $rawline =~ /\b59\s+Temple\s+Pl/i ||
2475                     $rawline =~ /\b51\s+Franklin\s+St/i) {
2476                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2477                         my $msg_type = \&ERROR;
2478                         $msg_type = \&CHK if ($file);
2479                         &{$msg_type}("FSF_MAILING_ADDRESS",
2480                                      "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
2481                 }
2482
2483 # check for Kconfig help text having a real description
2484 # Only applies when adding the entry originally, after that we do not have
2485 # sufficient context to determine whether it is indeed long enough.
2486                 if ($realfile =~ /Kconfig/ &&
2487                     $line =~ /^\+\s*config\s+/) {
2488                         my $length = 0;
2489                         my $cnt = $realcnt;
2490                         my $ln = $linenr + 1;
2491                         my $f;
2492                         my $is_start = 0;
2493                         my $is_end = 0;
2494                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
2495                                 $f = $lines[$ln - 1];
2496                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2497                                 $is_end = $lines[$ln - 1] =~ /^\+/;
2498
2499                                 next if ($f =~ /^-/);
2500                                 last if (!$file && $f =~ /^\@\@/);
2501
2502                                 if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) {
2503                                         $is_start = 1;
2504                                 } elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
2505                                         $length = -1;
2506                                 }
2507
2508                                 $f =~ s/^.//;
2509                                 $f =~ s/#.*//;
2510                                 $f =~ s/^\s+//;
2511                                 next if ($f =~ /^$/);
2512                                 if ($f =~ /^\s*config\s/) {
2513                                         $is_end = 1;
2514                                         last;
2515                                 }
2516                                 $length++;
2517                         }
2518                         if ($is_start && $is_end && $length < $min_conf_desc_length) {
2519                                 WARN("CONFIG_DESCRIPTION",
2520                                      "please write a paragraph that describes the config symbol fully\n" . $herecurr);
2521                         }
2522                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
2523                 }
2524
2525 # discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
2526                 if ($realfile =~ /Kconfig/ &&
2527                     $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
2528                         WARN("CONFIG_EXPERIMENTAL",
2529                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2530                 }
2531
2532 # discourage the use of boolean for type definition attributes of Kconfig options
2533                 if ($realfile =~ /Kconfig/ &&
2534                     $line =~ /^\+\s*\bboolean\b/) {
2535                         WARN("CONFIG_TYPE_BOOLEAN",
2536                              "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
2537                 }
2538
2539                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
2540                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
2541                         my $flag = $1;
2542                         my $replacement = {
2543                                 'EXTRA_AFLAGS' =>   'asflags-y',
2544                                 'EXTRA_CFLAGS' =>   'ccflags-y',
2545                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
2546                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
2547                         };
2548
2549                         WARN("DEPRECATED_VARIABLE",
2550                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
2551                 }
2552
2553 # check for DT compatible documentation
2554                 if (defined $root &&
2555                         (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
2556                          ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {
2557
2558                         my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
2559
2560                         my $dt_path = $root . "/Documentation/devicetree/bindings/";
2561                         my $vp_file = $dt_path . "vendor-prefixes.txt";
2562
2563                         foreach my $compat (@compats) {
2564                                 my $compat2 = $compat;
2565                                 $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
2566                                 my $compat3 = $compat;
2567                                 $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
2568                                 `grep -Erq "$compat|$compat2|$compat3" $dt_path`;
2569                                 if ( $? >> 8 ) {
2570                                         WARN("UNDOCUMENTED_DT_STRING",
2571                                              "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
2572                                 }
2573
2574                                 next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
2575                                 my $vendor = $1;
2576                                 `grep -Eq "^$vendor\\b" $vp_file`;
2577                                 if ( $? >> 8 ) {
2578                                         WARN("UNDOCUMENTED_DT_STRING",
2579                                              "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
2580                                 }
2581                         }
2582                 }
2583
2584 # check we are in a valid source file if not then ignore this hunk
2585                 next if ($realfile !~ /\.(h|c|s|S|pl|sh|dtsi|dts)$/);
2586
2587 # line length limit (with some exclusions)
2588 #
2589 # There are a few types of lines that may extend beyond $max_line_length:
2590 #       logging functions like pr_info that end in a string
2591 #       lines with a single string
2592 #       #defines that are a single string
2593 #
2594 # There are 3 different line length message types:
2595 # LONG_LINE_COMMENT     a comment starts before but extends beyond $max_linelength
2596 # LONG_LINE_STRING      a string starts before but extends beyond $max_line_length
2597 # LONG_LINE             all other lines longer than $max_line_length
2598 #
2599 # if LONG_LINE is ignored, the other 2 types are also ignored
2600 #
2601
2602                 if ($line =~ /^\+/ && $length > $max_line_length) {
2603                         my $msg_type = "LONG_LINE";
2604
2605                         # Check the allowed long line types first
2606
2607                         # logging functions that end in a string that starts
2608                         # before $max_line_length
2609                         if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
2610                             length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
2611                                 $msg_type = "";
2612
2613                         # lines with only strings (w/ possible termination)
2614                         # #defines with only strings
2615                         } elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
2616                                  $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
2617                                 $msg_type = "";
2618
2619                         # Otherwise set the alternate message types
2620
2621                         # a comment starts before $max_line_length
2622                         } elsif ($line =~ /($;[\s$;]*)$/ &&
2623                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
2624                                 $msg_type = "LONG_LINE_COMMENT"
2625
2626                         # a quoted string starts before $max_line_length
2627                         } elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
2628                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
2629                                 $msg_type = "LONG_LINE_STRING"
2630                         }
2631
2632                         if ($msg_type ne "" &&
2633                             (show_type("LONG_LINE") || show_type($msg_type))) {
2634                                 WARN($msg_type,
2635                                      "line over $max_line_length characters\n" . $herecurr);
2636                         }
2637                 }
2638
2639 # check for adding lines without a newline.
2640                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
2641                         WARN("MISSING_EOF_NEWLINE",
2642                              "adding a line without newline at end of file\n" . $herecurr);
2643                 }
2644
2645 # Blackfin: use hi/lo macros
2646                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
2647                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
2648                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2649                                 ERROR("LO_MACRO",
2650                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
2651                         }
2652                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
2653                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
2654                                 ERROR("HI_MACRO",
2655                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
2656                         }
2657                 }
2658
2659 # check we are in a valid source file C or perl if not then ignore this hunk
2660                 next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
2661
2662 # at the beginning of a line any tabs must come first and anything
2663 # more than 8 must use tabs.
2664                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
2665                     $rawline =~ /^\+\s*        \s*/) {
2666                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2667                         $rpt_cleaners = 1;
2668                         if (ERROR("CODE_INDENT",
2669                                   "code indent should use tabs where possible\n" . $herevet) &&
2670                             $fix) {
2671                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2672                         }
2673                 }
2674
2675 # check for space before tabs.
2676                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
2677                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2678                         if (WARN("SPACE_BEFORE_TAB",
2679                                 "please, no space before tabs\n" . $herevet) &&
2680                             $fix) {
2681                                 while ($fixed[$fixlinenr] =~
2682                                            s/(^\+.*) {8,8}\t/$1\t\t/) {}
2683                                 while ($fixed[$fixlinenr] =~
2684                                            s/(^\+.*) +\t/$1\t/) {}
2685                         }
2686                 }
2687
2688 # check for && or || at the start of a line
2689                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
2690                         CHK("LOGICAL_CONTINUATIONS",
2691                             "Logical continuations should be on the previous line\n" . $hereprev);
2692                 }
2693
2694 # check multi-line statement indentation matches previous line
2695                 if ($^V && $^V ge 5.10.0 &&
2696                     $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|$Ident\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
2697                         $prevline =~ /^\+(\t*)(.*)$/;
2698                         my $oldindent = $1;
2699                         my $rest = $2;
2700
2701                         my $pos = pos_last_openparen($rest);
2702                         if ($pos >= 0) {
2703                                 $line =~ /^(\+| )([ \t]*)/;
2704                                 my $newindent = $2;
2705
2706                                 my $goodtabindent = $oldindent .
2707                                         "\t" x ($pos / 8) .
2708                                         " "  x ($pos % 8);
2709                                 my $goodspaceindent = $oldindent . " "  x $pos;
2710
2711                                 if ($newindent ne $goodtabindent &&
2712                                     $newindent ne $goodspaceindent) {
2713
2714                                         if (CHK("PARENTHESIS_ALIGNMENT",
2715                                                 "Alignment should match open parenthesis\n" . $hereprev) &&
2716                                             $fix && $line =~ /^\+/) {
2717                                                 $fixed[$fixlinenr] =~
2718                                                     s/^\+[ \t]*/\+$goodtabindent/;
2719                                         }
2720                                 }
2721                         }
2722                 }
2723
2724 # check for space after cast like "(int) foo" or "(struct foo) bar"
2725 # avoid checking a few false positives:
2726 #   "sizeof(<type>)" or "__alignof__(<type>)"
2727 #   function pointer declarations like "(*foo)(int) = bar;"
2728 #   structure definitions like "(struct foo) { 0 };"
2729 #   multiline macros that define functions
2730 #   known attributes or the __attribute__ keyword
2731                 if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ &&
2732                     (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) {
2733                         if (CHK("SPACING",
2734                                 "No space is necessary after a cast\n" . $herecurr) &&
2735                             $fix) {
2736                                 $fixed[$fixlinenr] =~
2737                                     s/(\(\s*$Type\s*\))[ \t]+/$1/;
2738                         }
2739                 }
2740
2741                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2742                     $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
2743                     $rawline =~ /^\+[ \t]*\*/ &&
2744                     $realline > 2) {
2745                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2746                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
2747                 }
2748
2749                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2750                     $prevrawline =~ /^\+[ \t]*\/\*/ &&          #starting /*
2751                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
2752                     $rawline =~ /^\+/ &&                        #line is new
2753                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
2754                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2755                              "networking block comments start with * on subsequent lines\n" . $hereprev);
2756                 }
2757
2758                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
2759                     $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
2760                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
2761                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
2762                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
2763                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
2764                              "networking block comments put the trailing */ on a separate line\n" . $herecurr);
2765                 }
2766
2767 # check for missing blank lines after struct/union declarations
2768 # with exceptions for various attributes and macros
2769                 if ($prevline =~ /^[\+ ]};?\s*$/ &&
2770                     $line =~ /^\+/ &&
2771                     !($line =~ /^\+\s*$/ ||
2772                       $line =~ /^\+\s*EXPORT_SYMBOL/ ||
2773                       $line =~ /^\+\s*MODULE_/i ||
2774                       $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
2775                       $line =~ /^\+[a-z_]*init/ ||
2776                       $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
2777                       $line =~ /^\+\s*DECLARE/ ||
2778                       $line =~ /^\+\s*__setup/)) {
2779                         if (CHK("LINE_SPACING",
2780                                 "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
2781                             $fix) {
2782                                 fix_insert_line($fixlinenr, "\+");
2783                         }
2784                 }
2785
2786 # check for multiple consecutive blank lines
2787                 if ($prevline =~ /^[\+ ]\s*$/ &&
2788                     $line =~ /^\+\s*$/ &&
2789                     $last_blank_line != ($linenr - 1)) {
2790                         if (CHK("LINE_SPACING",
2791                                 "Please don't use multiple blank lines\n" . $hereprev) &&
2792                             $fix) {
2793                                 fix_delete_line($fixlinenr, $rawline);
2794                         }
2795
2796                         $last_blank_line = $linenr;
2797                 }
2798
2799 # check for missing blank lines after declarations
2800                 if ($sline =~ /^\+\s+\S/ &&                     #Not at char 1
2801                         # actual declarations
2802                     ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2803                         # function pointer declarations
2804                      $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2805                         # foo bar; where foo is some local typedef or #define
2806                      $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2807                         # known declaration macros
2808                      $prevline =~ /^\+\s+$declaration_macros/) &&
2809                         # for "else if" which can look like "$Ident $Ident"
2810                     !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
2811                         # other possible extensions of declaration lines
2812                       $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
2813                         # not starting a section or a macro "\" extended line
2814                       $prevline =~ /(?:\{\s*|\\)$/) &&
2815                         # looks like a declaration
2816                     !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
2817                         # function pointer declarations
2818                       $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
2819                         # foo bar; where foo is some local typedef or #define
2820                       $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
2821                         # known declaration macros
2822                       $sline =~ /^\+\s+$declaration_macros/ ||
2823                         # start of struct or union or enum
2824                       $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
2825                         # start or end of block or continuation of declaration
2826                       $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
2827                         # bitfield continuation
2828                       $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
2829                         # other possible extensions of declaration lines
2830                       $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
2831                         # indentation of previous and current line are the same
2832                     (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
2833                         if (WARN("LINE_SPACING",
2834                                  "Missing a blank line after declarations\n" . $hereprev) &&
2835                             $fix) {
2836                                 fix_insert_line($fixlinenr, "\+");
2837                         }
2838                 }
2839
2840 # check for spaces at the beginning of a line.
2841 # Exceptions:
2842 #  1) within comments
2843 #  2) indented preprocessor commands
2844 #  3) hanging labels
2845                 if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
2846                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
2847                         if (WARN("LEADING_SPACE",
2848                                  "please, no spaces at the start of a line\n" . $herevet) &&
2849                             $fix) {
2850                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
2851                         }
2852                 }
2853
2854 # check we are in a valid C source file if not then ignore this hunk
2855                 next if ($realfile !~ /\.(h|c)$/);
2856
2857 # check indentation of any line with a bare else
2858 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
2859 # if the previous line is a break or return and is indented 1 tab more...
2860                 if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
2861                         my $tabs = length($1) + 1;
2862                         if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
2863                             ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
2864                              defined $lines[$linenr] &&
2865                              $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
2866                                 WARN("UNNECESSARY_ELSE",
2867                                      "else is not generally useful after a break or return\n" . $hereprev);
2868                         }
2869                 }
2870
2871 # check indentation of a line with a break;
2872 # if the previous line is a goto or return and is indented the same # of tabs
2873                 if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
2874                         my $tabs = $1;
2875                         if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
2876                                 WARN("UNNECESSARY_BREAK",
2877                                      "break is not useful after a goto or return\n" . $hereprev);
2878                         }
2879                 }
2880
2881 # discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
2882                 if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
2883                         WARN("CONFIG_EXPERIMENTAL",
2884                              "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
2885                 }
2886
2887 # check for RCS/CVS revision markers
2888                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
2889                         WARN("CVS_KEYWORD",
2890                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
2891                 }
2892
2893 # Blackfin: don't use __builtin_bfin_[cs]sync
2894                 if ($line =~ /__builtin_bfin_csync/) {
2895                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2896                         ERROR("CSYNC",
2897                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
2898                 }
2899                 if ($line =~ /__builtin_bfin_ssync/) {
2900                         my $herevet = "$here\n" . cat_vet($line) . "\n";
2901                         ERROR("SSYNC",
2902                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
2903                 }
2904
2905 # check for old HOTPLUG __dev<foo> section markings
2906                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
2907                         WARN("HOTPLUG_SECTION",
2908                              "Using $1 is unnecessary\n" . $herecurr);
2909                 }
2910
2911 # Check for potential 'bare' types
2912                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
2913                     $realline_next);
2914 #print "LINE<$line>\n";
2915                 if ($linenr >= $suppress_statement &&
2916                     $realcnt && $sline =~ /.\s*\S/) {
2917                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2918                                 ctx_statement_block($linenr, $realcnt, 0);
2919                         $stat =~ s/\n./\n /g;
2920                         $cond =~ s/\n./\n /g;
2921
2922 #print "linenr<$linenr> <$stat>\n";
2923                         # If this statement has no statement boundaries within
2924                         # it there is no point in retrying a statement scan
2925                         # until we hit end of it.
2926                         my $frag = $stat; $frag =~ s/;+\s*$//;
2927                         if ($frag !~ /(?:{|;)/) {
2928 #print "skip<$line_nr_next>\n";
2929                                 $suppress_statement = $line_nr_next;
2930                         }
2931
2932                         # Find the real next line.
2933                         $realline_next = $line_nr_next;
2934                         if (defined $realline_next &&
2935                             (!defined $lines[$realline_next - 1] ||
2936                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
2937                                 $realline_next++;
2938                         }
2939
2940                         my $s = $stat;
2941                         $s =~ s/{.*$//s;
2942
2943                         # Ignore goto labels.
2944                         if ($s =~ /$Ident:\*$/s) {
2945
2946                         # Ignore functions being called
2947                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
2948
2949                         } elsif ($s =~ /^.\s*else\b/s) {
2950
2951                         # declarations always start with types
2952                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
2953                                 my $type = $1;
2954                                 $type =~ s/\s+/ /g;
2955                                 possible($type, "A:" . $s);
2956
2957                         # definitions in global scope can only start with types
2958                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
2959                                 possible($1, "B:" . $s);
2960                         }
2961
2962                         # any (foo ... *) is a pointer cast, and foo is a type
2963                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
2964                                 possible($1, "C:" . $s);
2965                         }
2966
2967                         # Check for any sort of function declaration.
2968                         # int foo(something bar, other baz);
2969                         # void (*store_gdt)(x86_descr_ptr *);
2970                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
2971                                 my ($name_len) = length($1);
2972
2973                                 my $ctx = $s;
2974                                 substr($ctx, 0, $name_len + 1, '');
2975                                 $ctx =~ s/\)[^\)]*$//;
2976
2977                                 for my $arg (split(/\s*,\s*/, $ctx)) {
2978                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2979
2980                                                 possible($1, "D:" . $s);
2981                                         }
2982                                 }
2983                         }
2984
2985                 }
2986
2987 #
2988 # Checks which may be anchored in the context.
2989 #
2990
2991 # Check for switch () and associated case and default
2992 # statements should be at the same indent.
2993                 if ($line=~/\bswitch\s*\(.*\)/) {
2994                         my $err = '';
2995                         my $sep = '';
2996                         my @ctx = ctx_block_outer($linenr, $realcnt);
2997                         shift(@ctx);
2998                         for my $ctx (@ctx) {
2999                                 my ($clen, $cindent) = line_stats($ctx);
3000                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
3001                                                         $indent != $cindent) {
3002                                         $err .= "$sep$ctx\n";
3003                                         $sep = '';
3004                                 } else {
3005                                         $sep = "[...]\n";
3006                                 }
3007                         }
3008                         if ($err ne '') {
3009                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
3010                                       "switch and case should be at the same indent\n$hereline$err");
3011                         }
3012                 }
3013
3014 # if/while/etc brace do not go on next line, unless defining a do while loop,
3015 # or if that brace on the next line is for something else
3016                 if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
3017                         my $pre_ctx = "$1$2";
3018
3019                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
3020
3021                         if ($line =~ /^\+\t{6,}/) {
3022                                 WARN("DEEP_INDENTATION",
3023                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
3024                         }
3025
3026                         my $ctx_cnt = $realcnt - $#ctx - 1;
3027                         my $ctx = join("\n", @ctx);
3028
3029                         my $ctx_ln = $linenr;
3030                         my $ctx_skip = $realcnt;
3031
3032                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
3033                                         defined $lines[$ctx_ln - 1] &&
3034                                         $lines[$ctx_ln - 1] =~ /^-/)) {
3035                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
3036                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
3037                                 $ctx_ln++;
3038                         }
3039
3040                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
3041                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
3042
3043                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
3044                                 ERROR("OPEN_BRACE",
3045                                       "that open brace { should be on the previous line\n" .
3046                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
3047                         }
3048                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
3049                             $ctx =~ /\)\s*\;\s*$/ &&
3050                             defined $lines[$ctx_ln - 1])
3051                         {
3052                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
3053                                 if ($nindent > $indent) {
3054                                         WARN("TRAILING_SEMICOLON",
3055                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
3056                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
3057                                 }
3058                         }
3059                 }
3060
3061 # Check relative indent for conditionals and blocks.
3062                 if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
3063                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
3064                                 ctx_statement_block($linenr, $realcnt, 0)
3065                                         if (!defined $stat);
3066                         my ($s, $c) = ($stat, $cond);
3067
3068                         substr($s, 0, length($c), '');
3069
3070                         # Make sure we remove the line prefixes as we have
3071                         # none on the first line, and are going to readd them
3072                         # where necessary.
3073                         $s =~ s/\n./\n/gs;
3074
3075                         # Find out how long the conditional actually is.
3076                         my @newlines = ($c =~ /\n/gs);
3077                         my $cond_lines = 1 + $#newlines;
3078
3079                         # We want to check the first line inside the block
3080                         # starting at the end of the conditional, so remove:
3081                         #  1) any blank line termination
3082                         #  2) any opening brace { on end of the line
3083                         #  3) any do (...) {
3084                         my $continuation = 0;
3085                         my $check = 0;
3086                         $s =~ s/^.*\bdo\b//;
3087                         $s =~ s/^\s*{//;
3088                         if ($s =~ s/^\s*\\//) {
3089                                 $continuation = 1;
3090                         }
3091                         if ($s =~ s/^\s*?\n//) {
3092                                 $check = 1;
3093                                 $cond_lines++;
3094                         }
3095
3096                         # Also ignore a loop construct at the end of a
3097                         # preprocessor statement.
3098                         if (($prevline =~ /^.\s*#\s*define\s/ ||
3099                             $prevline =~ /\\\s*$/) && $continuation == 0) {
3100                                 $check = 0;
3101                         }
3102
3103                         my $cond_ptr = -1;
3104                         $continuation = 0;
3105                         while ($cond_ptr != $cond_lines) {
3106                                 $cond_ptr = $cond_lines;
3107
3108                                 # If we see an #else/#elif then the code
3109                                 # is not linear.
3110                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
3111                                         $check = 0;
3112                                 }
3113
3114                                 # Ignore:
3115                                 #  1) blank lines, they should be at 0,
3116                                 #  2) preprocessor lines, and
3117                                 #  3) labels.
3118                                 if ($continuation ||
3119                                     $s =~ /^\s*?\n/ ||
3120                                     $s =~ /^\s*#\s*?/ ||
3121                                     $s =~ /^\s*$Ident\s*:/) {
3122                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
3123                                         if ($s =~ s/^.*?\n//) {
3124                                                 $cond_lines++;
3125                                         }
3126                                 }
3127                         }
3128
3129                         my (undef, $sindent) = line_stats("+" . $s);
3130                         my $stat_real = raw_line($linenr, $cond_lines);
3131
3132                         # Check if either of these lines are modified, else
3133                         # this is not this patch's fault.
3134                         if (!defined($stat_real) ||
3135                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
3136                                 $check = 0;
3137                         }
3138                         if (defined($stat_real) && $cond_lines > 1) {
3139                                 $stat_real = "[...]\n$stat_real";
3140                         }
3141
3142                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
3143
3144                         if ($check && (($sindent % 8) != 0 ||
3145                             ($sindent <= $indent && $s ne ''))) {
3146                                 WARN("SUSPECT_CODE_INDENT",
3147                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
3148                         }
3149                 }
3150
3151                 # Track the 'values' across context and added lines.
3152                 my $opline = $line; $opline =~ s/^./ /;
3153                 my ($curr_values, $curr_vars) =
3154                                 annotate_values($opline . "\n", $prev_values);
3155                 $curr_values = $prev_values . $curr_values;
3156                 if ($dbg_values) {
3157                         my $outline = $opline; $outline =~ s/\t/ /g;
3158                         print "$linenr > .$outline\n";
3159                         print "$linenr > $curr_values\n";
3160                         print "$linenr >  $curr_vars\n";
3161                 }
3162                 $prev_values = substr($curr_values, -1);
3163
3164 #ignore lines not being added
3165                 next if ($line =~ /^[^\+]/);
3166
3167 # TEST: allow direct testing of the type matcher.
3168                 if ($dbg_type) {
3169                         if ($line =~ /^.\s*$Declare\s*$/) {
3170                                 ERROR("TEST_TYPE",
3171                                       "TEST: is type\n" . $herecurr);
3172                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
3173                                 ERROR("TEST_NOT_TYPE",
3174                                       "TEST: is not type ($1 is)\n". $herecurr);
3175                         }
3176                         next;
3177                 }
3178 # TEST: allow direct testing of the attribute matcher.
3179                 if ($dbg_attr) {
3180                         if ($line =~ /^.\s*$Modifier\s*$/) {
3181                                 ERROR("TEST_ATTR",
3182                                       "TEST: is attr\n" . $herecurr);
3183                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
3184                                 ERROR("TEST_NOT_ATTR",
3185                                       "TEST: is not attr ($1 is)\n". $herecurr);
3186                         }
3187                         next;
3188                 }
3189
3190 # check for initialisation to aggregates open brace on the next line
3191                 if ($line =~ /^.\s*{/ &&
3192                     $prevline =~ /(?:^|[^=])=\s*$/) {
3193                         if (ERROR("OPEN_BRACE",
3194                                   "that open brace { should be on the previous line\n" . $hereprev) &&
3195                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3196                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3197                                 fix_delete_line($fixlinenr, $rawline);
3198                                 my $fixedline = $prevrawline;
3199                                 $fixedline =~ s/\s*=\s*$/ = {/;
3200                                 fix_insert_line($fixlinenr, $fixedline);
3201                                 $fixedline = $line;
3202                                 $fixedline =~ s/^(.\s*){\s*/$1/;
3203                                 fix_insert_line($fixlinenr, $fixedline);
3204                         }
3205                 }
3206
3207 #
3208 # Checks which are anchored on the added line.
3209 #
3210
3211 # check for malformed paths in #include statements (uses RAW line)
3212                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
3213                         my $path = $1;
3214                         if ($path =~ m{//}) {
3215                                 ERROR("MALFORMED_INCLUDE",
3216                                       "malformed #include filename\n" . $herecurr);
3217                         }
3218                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
3219                                 ERROR("UAPI_INCLUDE",
3220                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
3221                         }
3222                 }
3223
3224 # no C99 // comments
3225                 if ($line =~ m{//}) {
3226                         if (ERROR("C99_COMMENTS",
3227                                   "do not use C99 // comments\n" . $herecurr) &&
3228                             $fix) {
3229                                 my $line = $fixed[$fixlinenr];
3230                                 if ($line =~ /\/\/(.*)$/) {
3231                                         my $comment = trim($1);
3232                                         $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
3233                                 }
3234                         }
3235                 }
3236                 # Remove C99 comments.
3237                 $line =~ s@//.*@@;
3238                 $opline =~ s@//.*@@;
3239
3240 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
3241 # the whole statement.
3242 #print "APW <$lines[$realline_next - 1]>\n";
3243                 if (defined $realline_next &&
3244                     exists $lines[$realline_next - 1] &&
3245                     !defined $suppress_export{$realline_next} &&
3246                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3247                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3248                         # Handle definitions which produce identifiers with
3249                         # a prefix:
3250                         #   XXX(foo);
3251                         #   EXPORT_SYMBOL(something_foo);
3252                         my $name = $1;
3253                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
3254                             $name =~ /^${Ident}_$2/) {
3255 #print "FOO C name<$name>\n";
3256                                 $suppress_export{$realline_next} = 1;
3257
3258                         } elsif ($stat !~ /(?:
3259                                 \n.}\s*$|
3260                                 ^.DEFINE_$Ident\(\Q$name\E\)|
3261                                 ^.DECLARE_$Ident\(\Q$name\E\)|
3262                                 ^.LIST_HEAD\(\Q$name\E\)|
3263                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
3264                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
3265                             )/x) {
3266 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
3267                                 $suppress_export{$realline_next} = 2;
3268                         } else {
3269                                 $suppress_export{$realline_next} = 1;
3270                         }
3271                 }
3272                 if (!defined $suppress_export{$linenr} &&
3273                     $prevline =~ /^.\s*$/ &&
3274                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
3275                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
3276 #print "FOO B <$lines[$linenr - 1]>\n";
3277                         $suppress_export{$linenr} = 2;
3278                 }
3279                 if (defined $suppress_export{$linenr} &&
3280                     $suppress_export{$linenr} == 2) {
3281                         WARN("EXPORT_SYMBOL",
3282                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
3283                 }
3284
3285 # check for global initialisers.
3286                 if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*(?:0|NULL|false)\s*;/) {
3287                         if (ERROR("GLOBAL_INITIALISERS",
3288                                   "do not initialise globals to 0 or NULL\n" .
3289                                       $herecurr) &&
3290                             $fix) {
3291                                 $fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*(0|NULL|false)\s*;/$1;/;
3292                         }
3293                 }
3294 # check for static initialisers.
3295                 if ($line =~ /^\+.*\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
3296                         if (ERROR("INITIALISED_STATIC",
3297                                   "do not initialise statics to 0 or NULL\n" .
3298                                       $herecurr) &&
3299                             $fix) {
3300                                 $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*(0|NULL|false)\s*;/$1;/;
3301                         }
3302                 }
3303
3304 # check for misordered declarations of char/short/int/long with signed/unsigned
3305                 while ($sline =~ m{(\b$TypeMisordered\b)}g) {
3306                         my $tmp = trim($1);
3307                         WARN("MISORDERED_TYPE",
3308                              "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
3309                 }
3310
3311 # check for static const char * arrays.
3312                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
3313                         WARN("STATIC_CONST_CHAR_ARRAY",
3314                              "static const char * array should probably be static const char * const\n" .
3315                                 $herecurr);
3316                }
3317
3318 # check for static char foo[] = "bar" declarations.
3319                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
3320                         WARN("STATIC_CONST_CHAR_ARRAY",
3321                              "static char array declaration should probably be static const char\n" .
3322                                 $herecurr);
3323                }
3324
3325 # check for const <foo> const where <foo> is not a pointer or array type
3326                 if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
3327                         my $found = $1;
3328                         if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) {
3329                                 WARN("CONST_CONST",
3330                                      "'const $found const *' should probably be 'const $found * const'\n" . $herecurr);
3331                         } elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) {
3332                                 WARN("CONST_CONST",
3333                                      "'const $found const' should probably be 'const $found'\n" . $herecurr);
3334                         }
3335                 }
3336
3337 # check for non-global char *foo[] = {"bar", ...} declarations.
3338                 if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
3339                         WARN("STATIC_CONST_CHAR_ARRAY",
3340                              "char * array declaration might be better as static const\n" .
3341                                 $herecurr);
3342                }
3343
3344 # check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
3345                 if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
3346                         my $array = $1;
3347                         if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
3348                                 my $array_div = $1;
3349                                 if (WARN("ARRAY_SIZE",
3350                                          "Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
3351                                     $fix) {
3352                                         $fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
3353                                 }
3354                         }
3355                 }
3356
3357 # check for function declarations without arguments like "int foo()"
3358                 if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
3359                         if (ERROR("FUNCTION_WITHOUT_ARGS",
3360                                   "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
3361                             $fix) {
3362                                 $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
3363                         }
3364                 }
3365
3366 # check for uses of DEFINE_PCI_DEVICE_TABLE
3367                 if ($line =~ /\bDEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=/) {
3368                         if (WARN("DEFINE_PCI_DEVICE_TABLE",
3369                                  "Prefer struct pci_device_id over deprecated DEFINE_PCI_DEVICE_TABLE\n" . $herecurr) &&
3370                             $fix) {
3371                                 $fixed[$fixlinenr] =~ s/\b(?:static\s+|)DEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=\s*/static const struct pci_device_id $1\[\] = /;
3372                         }
3373                 }
3374
3375 # check for new typedefs, only function parameters and sparse annotations
3376 # make sense.
3377                 if ($line =~ /\btypedef\s/ &&
3378                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
3379                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
3380                     $line !~ /\b$typeTypedefs\b/ &&
3381                     $line !~ /\b__bitwise(?:__|)\b/) {
3382                         WARN("NEW_TYPEDEFS",
3383                              "do not add new typedefs\n" . $herecurr);
3384                 }
3385
3386 # * goes on variable not on type
3387                 # (char*[ const])
3388                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
3389                         #print "AA<$1>\n";
3390                         my ($ident, $from, $to) = ($1, $2, $2);
3391
3392                         # Should start with a space.
3393                         $to =~ s/^(\S)/ $1/;
3394                         # Should not end with a space.
3395                         $to =~ s/\s+$//;
3396                         # '*'s should not have spaces between.
3397                         while ($to =~ s/\*\s+\*/\*\*/) {
3398                         }
3399
3400 ##                      print "1: from<$from> to<$to> ident<$ident>\n";
3401                         if ($from ne $to) {
3402                                 if (ERROR("POINTER_LOCATION",
3403                                           "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
3404                                     $fix) {
3405                                         my $sub_from = $ident;
3406                                         my $sub_to = $ident;
3407                                         $sub_to =~ s/\Q$from\E/$to/;
3408                                         $fixed[$fixlinenr] =~
3409                                             s@\Q$sub_from\E@$sub_to@;
3410                                 }
3411                         }
3412                 }
3413                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
3414                         #print "BB<$1>\n";
3415                         my ($match, $from, $to, $ident) = ($1, $2, $2, $3);
3416
3417                         # Should start with a space.
3418                         $to =~ s/^(\S)/ $1/;
3419                         # Should not end with a space.
3420                         $to =~ s/\s+$//;
3421                         # '*'s should not have spaces between.
3422                         while ($to =~ s/\*\s+\*/\*\*/) {
3423                         }
3424                         # Modifiers should have spaces.
3425                         $to =~ s/(\b$Modifier$)/$1 /;
3426
3427 ##                      print "2: from<$from> to<$to> ident<$ident>\n";
3428                         if ($from ne $to && $ident !~ /^$Modifier$/) {
3429                                 if (ERROR("POINTER_LOCATION",
3430                                           "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
3431                                     $fix) {
3432
3433                                         my $sub_from = $match;
3434                                         my $sub_to = $match;
3435                                         $sub_to =~ s/\Q$from\E/$to/;
3436                                         $fixed[$fixlinenr] =~
3437                                             s@\Q$sub_from\E@$sub_to@;
3438                                 }
3439                         }
3440                 }
3441
3442 # # no BUG() or BUG_ON()
3443 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
3444 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
3445 #                       print "$herecurr";
3446 #                       $clean = 0;
3447 #               }
3448
3449                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
3450                         WARN("LINUX_VERSION_CODE",
3451                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
3452                 }
3453
3454 # check for uses of printk_ratelimit
3455                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
3456                         WARN("PRINTK_RATELIMITED",
3457                              "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
3458                 }
3459
3460 # printk should use KERN_* levels.  Note that follow on printk's on the
3461 # same line do not need a level, so we use the current block context
3462 # to try and find and validate the current printk.  In summary the current
3463 # printk includes all preceding printk's which have no newline on the end.
3464 # we assume the first bad printk is the one to report.
3465                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
3466                         my $ok = 0;
3467                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
3468                                 #print "CHECK<$lines[$ln - 1]\n";
3469                                 # we have a preceding printk if it ends
3470                                 # with "\n" ignore it, else it is to blame
3471                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
3472                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
3473                                                 $ok = 1;
3474                                         }
3475                                         last;
3476                                 }
3477                         }
3478                         if ($ok == 0) {
3479                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
3480                                      "printk() should include KERN_ facility level\n" . $herecurr);
3481                         }
3482                 }
3483
3484                 if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
3485                         my $orig = $1;
3486                         my $level = lc($orig);
3487                         $level = "warn" if ($level eq "warning");
3488                         my $level2 = $level;
3489                         $level2 = "dbg" if ($level eq "debug");
3490                         WARN("PREFER_PR_LEVEL",
3491                              "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
3492                 }
3493
3494                 if ($line =~ /\bpr_warning\s*\(/) {
3495                         if (WARN("PREFER_PR_LEVEL",
3496                                  "Prefer pr_warn(... to pr_warning(...\n" . $herecurr) &&
3497                             $fix) {
3498                                 $fixed[$fixlinenr] =~
3499                                     s/\bpr_warning\b/pr_warn/;
3500                         }
3501                 }
3502
3503                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
3504                         my $orig = $1;
3505                         my $level = lc($orig);
3506                         $level = "warn" if ($level eq "warning");
3507                         $level = "dbg" if ($level eq "debug");
3508                         WARN("PREFER_DEV_LEVEL",
3509                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
3510                 }
3511
3512 # ENOSYS means "bad syscall nr" and nothing else.  This will have a small
3513 # number of false positives, but assembly files are not checked, so at
3514 # least the arch entry code will not trigger this warning.
3515                 if ($line =~ /\bENOSYS\b/) {
3516                         WARN("ENOSYS",
3517                              "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr);
3518                 }
3519
3520 # function brace can't be on same line, except for #defines of do while,
3521 # or if closed on same line
3522                 if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and
3523                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
3524                         if (ERROR("OPEN_BRACE",
3525                                   "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
3526                             $fix) {
3527                                 fix_delete_line($fixlinenr, $rawline);
3528                                 my $fixed_line = $rawline;
3529                                 $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
3530                                 my $line1 = $1;
3531                                 my $line2 = $2;
3532                                 fix_insert_line($fixlinenr, ltrim($line1));
3533                                 fix_insert_line($fixlinenr, "\+{");
3534                                 if ($line2 !~ /^\s*$/) {
3535                                         fix_insert_line($fixlinenr, "\+\t" . trim($line2));
3536                                 }
3537                         }
3538                 }
3539
3540 # open braces for enum, union and struct go on the same line.
3541                 if ($line =~ /^.\s*{/ &&
3542                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
3543                         if (ERROR("OPEN_BRACE",
3544                                   "open brace '{' following $1 go on the same line\n" . $hereprev) &&
3545                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
3546                                 fix_delete_line($fixlinenr - 1, $prevrawline);
3547                                 fix_delete_line($fixlinenr, $rawline);
3548                                 my $fixedline = rtrim($prevrawline) . " {";
3549                                 fix_insert_line($fixlinenr, $fixedline);
3550                                 $fixedline = $rawline;
3551                                 $fixedline =~ s/^(.\s*){\s*/$1\t/;
3552                                 if ($fixedline !~ /^\+\s*$/) {
3553                                         fix_insert_line($fixlinenr, $fixedline);
3554                                 }
3555                         }
3556                 }
3557
3558 # missing space after union, struct or enum definition
3559                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
3560                         if (WARN("SPACING",
3561                                  "missing space after $1 definition\n" . $herecurr) &&
3562                             $fix) {
3563                                 $fixed[$fixlinenr] =~
3564                                     s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
3565                         }
3566                 }
3567
3568 # Function pointer declarations
3569 # check spacing between type, funcptr, and args
3570 # canonical declaration is "type (*funcptr)(args...)"
3571                 if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
3572                         my $declare = $1;
3573                         my $pre_pointer_space = $2;
3574                         my $post_pointer_space = $3;
3575                         my $funcname = $4;
3576                         my $post_funcname_space = $5;
3577                         my $pre_args_space = $6;
3578
3579 # the $Declare variable will capture all spaces after the type
3580 # so check it for a missing trailing missing space but pointer return types
3581 # don't need a space so don't warn for those.
3582                         my $post_declare_space = "";
3583                         if ($declare =~ /(\s+)$/) {
3584                                 $post_declare_space = $1;
3585                                 $declare = rtrim($declare);
3586                         }
3587                         if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
3588                                 WARN("SPACING",
3589                                      "missing space after return type\n" . $herecurr);
3590                                 $post_declare_space = " ";
3591                         }
3592
3593 # unnecessary space "type  (*funcptr)(args...)"
3594 # This test is not currently implemented because these declarations are
3595 # equivalent to
3596 #       int  foo(int bar, ...)
3597 # and this is form shouldn't/doesn't generate a checkpatch warning.
3598 #
3599 #                       elsif ($declare =~ /\s{2,}$/) {
3600 #                               WARN("SPACING",
3601 #                                    "Multiple spaces after return type\n" . $herecurr);
3602 #                       }
3603
3604 # unnecessary space "type ( *funcptr)(args...)"
3605                         if (defined $pre_pointer_space &&
3606                             $pre_pointer_space =~ /^\s/) {
3607                                 WARN("SPACING",
3608                                      "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
3609                         }
3610
3611 # unnecessary space "type (* funcptr)(args...)"
3612                         if (defined $post_pointer_space &&
3613                             $post_pointer_space =~ /^\s/) {
3614                                 WARN("SPACING",
3615                                      "Unnecessary space before function pointer name\n" . $herecurr);
3616                         }
3617
3618 # unnecessary space "type (*funcptr )(args...)"
3619                         if (defined $post_funcname_space &&
3620                             $post_funcname_space =~ /^\s/) {
3621                                 WARN("SPACING",
3622                                      "Unnecessary space after function pointer name\n" . $herecurr);
3623                         }
3624
3625 # unnecessary space "type (*funcptr) (args...)"
3626                         if (defined $pre_args_space &&
3627                             $pre_args_space =~ /^\s/) {
3628                                 WARN("SPACING",
3629                                      "Unnecessary space before function pointer arguments\n" . $herecurr);
3630                         }
3631
3632                         if (show_type("SPACING") && $fix) {
3633                                 $fixed[$fixlinenr] =~
3634                                     s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
3635                         }
3636                 }
3637
3638 # check for spacing round square brackets; allowed:
3639 #  1. with a type on the left -- int [] a;
3640 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
3641 #  3. inside a curly brace -- = { [0...10] = 5 }
3642                 while ($line =~ /(.*?\s)\[/g) {
3643                         my ($where, $prefix) = ($-[1], $1);
3644                         if ($prefix !~ /$Type\s+$/ &&
3645                             ($where != 0 || $prefix !~ /^.\s+$/) &&
3646                             $prefix !~ /[{,]\s+$/) {
3647                                 if (ERROR("BRACKET_SPACE",
3648                                           "space prohibited before open square bracket '['\n" . $herecurr) &&
3649                                     $fix) {
3650                                     $fixed[$fixlinenr] =~
3651                                         s/^(\+.*?)\s+\[/$1\[/;
3652                                 }
3653                         }
3654                 }
3655
3656 # check for spaces between functions and their parentheses.
3657                 while ($line =~ /($Ident)\s+\(/g) {
3658                         my $name = $1;
3659                         my $ctx_before = substr($line, 0, $-[1]);
3660                         my $ctx = "$ctx_before$name";
3661
3662                         # Ignore those directives where spaces _are_ permitted.
3663                         if ($name =~ /^(?:
3664                                 if|for|while|switch|return|case|
3665                                 volatile|__volatile__|
3666                                 __attribute__|format|__extension__|
3667                                 asm|__asm__)$/x)
3668                         {
3669                         # cpp #define statements have non-optional spaces, ie
3670                         # if there is a space between the name and the open
3671                         # parenthesis it is simply not a parameter group.
3672                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
3673
3674                         # cpp #elif statement condition may start with a (
3675                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
3676
3677                         # If this whole things ends with a type its most
3678                         # likely a typedef for a function.
3679                         } elsif ($ctx =~ /$Type$/) {
3680
3681                         } else {
3682                                 if (WARN("SPACING",
3683                                          "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
3684                                              $fix) {
3685                                         $fixed[$fixlinenr] =~
3686                                             s/\b$name\s+\(/$name\(/;
3687                                 }
3688                         }
3689                 }
3690
3691 # Check operator spacing.
3692                 if (!($line=~/\#\s*include/)) {
3693                         my $fixed_line = "";
3694                         my $line_fixed = 0;
3695
3696                         my $ops = qr{
3697                                 <<=|>>=|<=|>=|==|!=|
3698                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
3699                                 =>|->|<<|>>|<|>|=|!|~|
3700                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
3701                                 \?:|\?|:
3702                         }x;
3703                         my @elements = split(/($ops|;)/, $opline);
3704
3705 ##                      print("element count: <" . $#elements . ">\n");
3706 ##                      foreach my $el (@elements) {
3707 ##                              print("el: <$el>\n");
3708 ##                      }
3709
3710                         my @fix_elements = ();
3711                         my $off = 0;
3712
3713                         foreach my $el (@elements) {
3714                                 push(@fix_elements, substr($rawline, $off, length($el)));
3715                                 $off += length($el);
3716                         }
3717
3718                         $off = 0;
3719
3720                         my $blank = copy_spacing($opline);
3721                         my $last_after = -1;
3722
3723                         for (my $n = 0; $n < $#elements; $n += 2) {
3724
3725                                 my $good = $fix_elements[$n] . $fix_elements[$n + 1];
3726
3727 ##                              print("n: <$n> good: <$good>\n");
3728
3729                                 $off += length($elements[$n]);
3730
3731                                 # Pick up the preceding and succeeding characters.
3732                                 my $ca = substr($opline, 0, $off);
3733                                 my $cc = '';
3734                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
3735                                         $cc = substr($opline, $off + length($elements[$n + 1]));
3736                                 }
3737                                 my $cb = "$ca$;$cc";
3738
3739                                 my $a = '';
3740                                 $a = 'V' if ($elements[$n] ne '');
3741                                 $a = 'W' if ($elements[$n] =~ /\s$/);
3742                                 $a = 'C' if ($elements[$n] =~ /$;$/);
3743                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
3744                                 $a = 'O' if ($elements[$n] eq '');
3745                                 $a = 'E' if ($ca =~ /^\s*$/);
3746
3747                                 my $op = $elements[$n + 1];
3748
3749                                 my $c = '';
3750                                 if (defined $elements[$n + 2]) {
3751                                         $c = 'V' if ($elements[$n + 2] ne '');
3752                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
3753                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
3754                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
3755                                         $c = 'O' if ($elements[$n + 2] eq '');
3756                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
3757                                 } else {
3758                                         $c = 'E';
3759                                 }
3760
3761                                 my $ctx = "${a}x${c}";
3762
3763                                 my $at = "(ctx:$ctx)";
3764
3765                                 my $ptr = substr($blank, 0, $off) . "^";
3766                                 my $hereptr = "$hereline$ptr\n";
3767
3768                                 # Pull out the value of this operator.
3769                                 my $op_type = substr($curr_values, $off + 1, 1);
3770
3771                                 # Get the full operator variant.
3772                                 my $opv = $op . substr($curr_vars, $off, 1);
3773
3774                                 # Ignore operators passed as parameters.
3775                                 if ($op_type ne 'V' &&
3776                                     $ca =~ /\s$/ && $cc =~ /^\s*[,\)]/) {
3777
3778 #                               # Ignore comments
3779 #                               } elsif ($op =~ /^$;+$/) {
3780
3781                                 # ; should have either the end of line or a space or \ after it
3782                                 } elsif ($op eq ';') {
3783                                         if ($ctx !~ /.x[WEBC]/ &&
3784                                             $cc !~ /^\\/ && $cc !~ /^;/) {
3785                                                 if (ERROR("SPACING",
3786                                                           "space required after that '$op' $at\n" . $hereptr)) {
3787                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3788                                                         $line_fixed = 1;
3789                                                 }
3790                                         }
3791
3792                                 # // is a comment
3793                                 } elsif ($op eq '//') {
3794
3795                                 #   :   when part of a bitfield
3796                                 } elsif ($opv eq ':B') {
3797                                         # skip the bitfield test for now
3798
3799                                 # No spaces for:
3800                                 #   ->
3801                                 } elsif ($op eq '->') {
3802                                         if ($ctx =~ /Wx.|.xW/) {
3803                                                 if (ERROR("SPACING",
3804                                                           "spaces prohibited around that '$op' $at\n" . $hereptr)) {
3805                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3806                                                         if (defined $fix_elements[$n + 2]) {
3807                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3808                                                         }
3809                                                         $line_fixed = 1;
3810                                                 }
3811                                         }
3812
3813                                 # , must not have a space before and must have a space on the right.
3814                                 } elsif ($op eq ',') {
3815                                         my $rtrim_before = 0;
3816                                         my $space_after = 0;
3817                                         if ($ctx =~ /Wx./) {
3818                                                 if (ERROR("SPACING",
3819                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3820                                                         $line_fixed = 1;
3821                                                         $rtrim_before = 1;
3822                                                 }
3823                                         }
3824                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
3825                                                 if (ERROR("SPACING",
3826                                                           "space required after that '$op' $at\n" . $hereptr)) {
3827                                                         $line_fixed = 1;
3828                                                         $last_after = $n;
3829                                                         $space_after = 1;
3830                                                 }
3831                                         }
3832                                         if ($rtrim_before || $space_after) {
3833                                                 if ($rtrim_before) {
3834                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3835                                                 } else {
3836                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3837                                                 }
3838                                                 if ($space_after) {
3839                                                         $good .= " ";
3840                                                 }
3841                                         }
3842
3843                                 # '*' as part of a type definition -- reported already.
3844                                 } elsif ($opv eq '*_') {
3845                                         #warn "'*' is part of type\n";
3846
3847                                 # unary operators should have a space before and
3848                                 # none after.  May be left adjacent to another
3849                                 # unary operator, or a cast
3850                                 } elsif ($op eq '!' || $op eq '~' ||
3851                                          $opv eq '*U' || $opv eq '-U' ||
3852                                          $opv eq '&U' || $opv eq '&&U') {
3853                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
3854                                                 if (ERROR("SPACING",
3855                                                           "space required before that '$op' $at\n" . $hereptr)) {
3856                                                         if ($n != $last_after + 2) {
3857                                                                 $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
3858                                                                 $line_fixed = 1;
3859                                                         }
3860                                                 }
3861                                         }
3862                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
3863                                                 # A unary '*' may be const
3864
3865                                         } elsif ($ctx =~ /.xW/) {
3866                                                 if (ERROR("SPACING",
3867                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3868                                                         $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
3869                                                         if (defined $fix_elements[$n + 2]) {
3870                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3871                                                         }
3872                                                         $line_fixed = 1;
3873                                                 }
3874                                         }
3875
3876                                 # unary ++ and unary -- are allowed no space on one side.
3877                                 } elsif ($op eq '++' or $op eq '--') {
3878                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
3879                                                 if (ERROR("SPACING",
3880                                                           "space required one side of that '$op' $at\n" . $hereptr)) {
3881                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
3882                                                         $line_fixed = 1;
3883                                                 }
3884                                         }
3885                                         if ($ctx =~ /Wx[BE]/ ||
3886                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
3887                                                 if (ERROR("SPACING",
3888                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3889                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3890                                                         $line_fixed = 1;
3891                                                 }
3892                                         }
3893                                         if ($ctx =~ /ExW/) {
3894                                                 if (ERROR("SPACING",
3895                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
3896                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
3897                                                         if (defined $fix_elements[$n + 2]) {
3898                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3899                                                         }
3900                                                         $line_fixed = 1;
3901                                                 }
3902                                         }
3903
3904                                 # << and >> may either have or not have spaces both sides
3905                                 } elsif ($op eq '<<' or $op eq '>>' or
3906                                          $op eq '&' or $op eq '^' or $op eq '|' or
3907                                          $op eq '+' or $op eq '-' or
3908                                          $op eq '*' or $op eq '/' or
3909                                          $op eq '%')
3910                                 {
3911                                         if ($check) {
3912                                                 if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
3913                                                         if (CHK("SPACING",
3914                                                                 "spaces preferred around that '$op' $at\n" . $hereptr)) {
3915                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3916                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3917                                                                 $line_fixed = 1;
3918                                                         }
3919                                                 } elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
3920                                                         if (CHK("SPACING",
3921                                                                 "space preferred before that '$op' $at\n" . $hereptr)) {
3922                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
3923                                                                 $line_fixed = 1;
3924                                                         }
3925                                                 }
3926                                         } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
3927                                                 if (ERROR("SPACING",
3928                                                           "need consistent spacing around '$op' $at\n" . $hereptr)) {
3929                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3930                                                         if (defined $fix_elements[$n + 2]) {
3931                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3932                                                         }
3933                                                         $line_fixed = 1;
3934                                                 }
3935                                         }
3936
3937                                 # A colon needs no spaces before when it is
3938                                 # terminating a case value or a label.
3939                                 } elsif ($opv eq ':C' || $opv eq ':L') {
3940                                         if ($ctx =~ /Wx./) {
3941                                                 if (ERROR("SPACING",
3942                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
3943                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
3944                                                         $line_fixed = 1;
3945                                                 }
3946                                         }
3947
3948                                 # All the others need spaces both sides.
3949                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
3950                                         my $ok = 0;
3951
3952                                         # Ignore email addresses <foo@bar>
3953                                         if (($op eq '<' &&
3954                                              $cc =~ /^\S+\@\S+>/) ||
3955                                             ($op eq '>' &&
3956                                              $ca =~ /<\S+\@\S+$/))
3957                                         {
3958                                                 $ok = 1;
3959                                         }
3960
3961                                         # for asm volatile statements
3962                                         # ignore a colon with another
3963                                         # colon immediately before or after
3964                                         if (($op eq ':') &&
3965                                             ($ca =~ /:$/ || $cc =~ /^:/)) {
3966                                                 $ok = 1;
3967                                         }
3968
3969                                         # messages are ERROR, but ?: are CHK
3970                                         if ($ok == 0) {
3971                                                 my $msg_type = \&ERROR;
3972                                                 $msg_type = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);
3973
3974                                                 if (&{$msg_type}("SPACING",
3975                                                                  "spaces required around that '$op' $at\n" . $hereptr)) {
3976                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
3977                                                         if (defined $fix_elements[$n + 2]) {
3978                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
3979                                                         }
3980                                                         $line_fixed = 1;
3981                                                 }
3982                                         }
3983                                 }
3984                                 $off += length($elements[$n + 1]);
3985
3986 ##                              print("n: <$n> GOOD: <$good>\n");
3987
3988                                 $fixed_line = $fixed_line . $good;
3989                         }
3990
3991                         if (($#elements % 2) == 0) {
3992                                 $fixed_line = $fixed_line . $fix_elements[$#elements];
3993                         }
3994
3995                         if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
3996                                 $fixed[$fixlinenr] = $fixed_line;
3997                         }
3998
3999
4000                 }
4001
4002 # check for whitespace before a non-naked semicolon
4003                 if ($line =~ /^\+.*\S\s+;\s*$/) {
4004                         if (WARN("SPACING",
4005                                  "space prohibited before semicolon\n" . $herecurr) &&
4006                             $fix) {
4007                                 1 while $fixed[$fixlinenr] =~
4008                                     s/^(\+.*\S)\s+;/$1;/;
4009                         }
4010                 }
4011
4012 # check for multiple assignments
4013                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
4014                         CHK("MULTIPLE_ASSIGNMENTS",
4015                             "multiple assignments should be avoided\n" . $herecurr);
4016                 }
4017
4018 ## # check for multiple declarations, allowing for a function declaration
4019 ## # continuation.
4020 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
4021 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
4022 ##
4023 ##                      # Remove any bracketed sections to ensure we do not
4024 ##                      # falsly report the parameters of functions.
4025 ##                      my $ln = $line;
4026 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
4027 ##                      }
4028 ##                      if ($ln =~ /,/) {
4029 ##                              WARN("MULTIPLE_DECLARATION",
4030 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
4031 ##                      }
4032 ##              }
4033
4034 #need space before brace following if, while, etc
4035                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
4036                     $line =~ /do{/) {
4037                         if (ERROR("SPACING",
4038                                   "space required before the open brace '{'\n" . $herecurr) &&
4039                             $fix) {
4040                                 $fixed[$fixlinenr] =~ s/^(\+.*(?:do|\))){/$1 {/;
4041                         }
4042                 }
4043
4044 ## # check for blank lines before declarations
4045 ##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
4046 ##                  $prevrawline =~ /^.\s*$/) {
4047 ##                      WARN("SPACING",
4048 ##                           "No blank lines before declarations\n" . $hereprev);
4049 ##              }
4050 ##
4051
4052 # closing brace should have a space following it when it has anything
4053 # on the line
4054                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
4055                         if (ERROR("SPACING",
4056                                   "space required after that close brace '}'\n" . $herecurr) &&
4057                             $fix) {
4058                                 $fixed[$fixlinenr] =~
4059                                     s/}((?!(?:,|;|\)))\S)/} $1/;
4060                         }
4061                 }
4062
4063 # check spacing on square brackets
4064                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
4065                         if (ERROR("SPACING",
4066                                   "space prohibited after that open square bracket '['\n" . $herecurr) &&
4067                             $fix) {
4068                                 $fixed[$fixlinenr] =~
4069                                     s/\[\s+/\[/;
4070                         }
4071                 }
4072                 if ($line =~ /\s\]/) {
4073                         if (ERROR("SPACING",
4074                                   "space prohibited before that close square bracket ']'\n" . $herecurr) &&
4075                             $fix) {
4076                                 $fixed[$fixlinenr] =~
4077                                     s/\s+\]/\]/;
4078                         }
4079                 }
4080
4081 # check spacing on parentheses
4082                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
4083                     $line !~ /for\s*\(\s+;/) {
4084                         if (ERROR("SPACING",
4085                                   "space prohibited after that open parenthesis '('\n" . $herecurr) &&
4086                             $fix) {
4087                                 $fixed[$fixlinenr] =~
4088                                     s/\(\s+/\(/;
4089                         }
4090                 }
4091                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
4092                     $line !~ /for\s*\(.*;\s+\)/ &&
4093                     $line !~ /:\s+\)/) {
4094                         if (ERROR("SPACING",
4095                                   "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
4096                             $fix) {
4097                                 $fixed[$fixlinenr] =~
4098                                     s/\s+\)/\)/;
4099                         }
4100                 }
4101
4102 # check unnecessary parentheses around addressof/dereference single $Lvals
4103 # ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
4104
4105                 while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
4106                         my $var = $1;
4107                         if (CHK("UNNECESSARY_PARENTHESES",
4108                                 "Unnecessary parentheses around $var\n" . $herecurr) &&
4109                             $fix) {
4110                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
4111                         }
4112                 }
4113
4114 # check for unnecessary parentheses around function pointer uses
4115 # ie: (foo->bar)(); should be foo->bar();
4116 # but not "if (foo->bar) (" to avoid some false positives
4117                 if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
4118                         my $var = $2;
4119                         if (CHK("UNNECESSARY_PARENTHESES",
4120                                 "Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
4121                             $fix) {
4122                                 my $var2 = deparenthesize($var);
4123                                 $var2 =~ s/\s//g;
4124                                 $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
4125                         }
4126                 }
4127
4128 #goto labels aren't indented, allow a single space however
4129                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
4130                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
4131                         if (WARN("INDENTED_LABEL",
4132                                  "labels should not be indented\n" . $herecurr) &&
4133                             $fix) {
4134                                 $fixed[$fixlinenr] =~
4135                                     s/^(.)\s+/$1/;
4136                         }
4137                 }
4138
4139 # return is not a function
4140                 if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
4141                         my $spacing = $1;
4142                         if ($^V && $^V ge 5.10.0 &&
4143                             $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
4144                                 my $value = $1;
4145                                 $value = deparenthesize($value);
4146                                 if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
4147                                         ERROR("RETURN_PARENTHESES",
4148                                               "return is not a function, parentheses are not required\n" . $herecurr);
4149                                 }
4150                         } elsif ($spacing !~ /\s+/) {
4151                                 ERROR("SPACING",
4152                                       "space required before the open parenthesis '('\n" . $herecurr);
4153                         }
4154                 }
4155
4156 # unnecessary return in a void function
4157 # at end-of-function, with the previous line a single leading tab, then return;
4158 # and the line before that not a goto label target like "out:"
4159                 if ($sline =~ /^[ \+]}\s*$/ &&
4160                     $prevline =~ /^\+\treturn\s*;\s*$/ &&
4161                     $linenr >= 3 &&
4162                     $lines[$linenr - 3] =~ /^[ +]/ &&
4163                     $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
4164                         WARN("RETURN_VOID",
4165                              "void function return statements are not generally useful\n" . $hereprev);
4166                }
4167
4168 # if statements using unnecessary parentheses - ie: if ((foo == bar))
4169                 if ($^V && $^V ge 5.10.0 &&
4170                     $line =~ /\bif\s*((?:\(\s*){2,})/) {
4171                         my $openparens = $1;
4172                         my $count = $openparens =~ tr@\(@\(@;
4173                         my $msg = "";
4174                         if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
4175                                 my $comp = $4;  #Not $1 because of $LvalOrFunc
4176                                 $msg = " - maybe == should be = ?" if ($comp eq "==");
4177                                 WARN("UNNECESSARY_PARENTHESES",
4178                                      "Unnecessary parentheses$msg\n" . $herecurr);
4179                         }
4180                 }
4181
4182 # Return of what appears to be an errno should normally be negative
4183                 if ($sline =~ /\breturn(?:\s*\(+\s*|\s+)(E[A-Z]+)(?:\s*\)+\s*|\s*)[;:,]/) {
4184                         my $name = $1;
4185                         if ($name ne 'EOF' && $name ne 'ERROR') {
4186                                 WARN("USE_NEGATIVE_ERRNO",
4187                                      "return of an errno should typically be negative (ie: return -$1)\n" . $herecurr);
4188                         }
4189                 }
4190
4191 # Need a space before open parenthesis after if, while etc
4192                 if ($line =~ /\b(if|while|for|switch)\(/) {
4193                         if (ERROR("SPACING",
4194                                   "space required before the open parenthesis '('\n" . $herecurr) &&
4195                             $fix) {
4196                                 $fixed[$fixlinenr] =~
4197                                     s/\b(if|while|for|switch)\(/$1 \(/;
4198                         }
4199                 }
4200
4201 # Check for illegal assignment in if conditional -- and check for trailing
4202 # statements after the conditional.
4203                 if ($line =~ /do\s*(?!{)/) {
4204                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
4205                                 ctx_statement_block($linenr, $realcnt, 0)
4206                                         if (!defined $stat);
4207                         my ($stat_next) = ctx_statement_block($line_nr_next,
4208                                                 $remain_next, $off_next);
4209                         $stat_next =~ s/\n./\n /g;
4210                         ##print "stat<$stat> stat_next<$stat_next>\n";
4211
4212                         if ($stat_next =~ /^\s*while\b/) {
4213                                 # If the statement carries leading newlines,
4214                                 # then count those as offsets.
4215                                 my ($whitespace) =
4216                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
4217                                 my $offset =
4218                                         statement_rawlines($whitespace) - 1;
4219
4220                                 $suppress_whiletrailers{$line_nr_next +
4221                                                                 $offset} = 1;
4222                         }
4223                 }
4224                 if (!defined $suppress_whiletrailers{$linenr} &&
4225                     defined($stat) && defined($cond) &&
4226                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
4227                         my ($s, $c) = ($stat, $cond);
4228
4229                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
4230                                 ERROR("ASSIGN_IN_IF",
4231                                       "do not use assignment in if condition\n" . $herecurr);
4232                         }
4233
4234                         # Find out what is on the end of the line after the
4235                         # conditional.
4236                         substr($s, 0, length($c), '');
4237                         $s =~ s/\n.*//g;
4238                         $s =~ s/$;//g;  # Remove any comments
4239                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
4240                             $c !~ /}\s*while\s*/)
4241                         {
4242                                 # Find out how long the conditional actually is.
4243                                 my @newlines = ($c =~ /\n/gs);
4244                                 my $cond_lines = 1 + $#newlines;
4245                                 my $stat_real = '';
4246
4247                                 $stat_real = raw_line($linenr, $cond_lines)
4248                                                         . "\n" if ($cond_lines);
4249                                 if (defined($stat_real) && $cond_lines > 1) {
4250                                         $stat_real = "[...]\n$stat_real";
4251                                 }
4252
4253                                 ERROR("TRAILING_STATEMENTS",
4254                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
4255                         }
4256                 }
4257
4258 # Check for bitwise tests written as boolean
4259                 if ($line =~ /
4260                         (?:
4261                                 (?:\[|\(|\&\&|\|\|)
4262                                 \s*0[xX][0-9]+\s*
4263                                 (?:\&\&|\|\|)
4264                         |
4265                                 (?:\&\&|\|\|)
4266                                 \s*0[xX][0-9]+\s*
4267                                 (?:\&\&|\|\||\)|\])
4268                         )/x)
4269                 {
4270                         WARN("HEXADECIMAL_BOOLEAN_TEST",
4271                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
4272                 }
4273
4274 # if and else should not have general statements after it
4275                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
4276                         my $s = $1;
4277                         $s =~ s/$;//g;  # Remove any comments
4278                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
4279                                 ERROR("TRAILING_STATEMENTS",
4280                                       "trailing statements should be on next line\n" . $herecurr);
4281                         }
4282                 }
4283 # if should not continue a brace
4284                 if ($line =~ /}\s*if\b/) {
4285                         ERROR("TRAILING_STATEMENTS",
4286                               "trailing statements should be on next line (or did you mean 'else if'?)\n" .
4287                                 $herecurr);
4288                 }
4289 # case and default should not have general statements after them
4290                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
4291                     $line !~ /\G(?:
4292                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
4293                         \s*return\s+
4294                     )/xg)
4295                 {
4296                         ERROR("TRAILING_STATEMENTS",
4297                               "trailing statements should be on next line\n" . $herecurr);
4298                 }
4299
4300                 # Check for }<nl>else {, these must be at the same
4301                 # indent level to be relevant to each other.
4302                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
4303                     $previndent == $indent) {
4304                         if (ERROR("ELSE_AFTER_BRACE",
4305                                   "else should follow close brace '}'\n" . $hereprev) &&
4306                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4307                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4308                                 fix_delete_line($fixlinenr, $rawline);
4309                                 my $fixedline = $prevrawline;
4310                                 $fixedline =~ s/}\s*$//;
4311                                 if ($fixedline !~ /^\+\s*$/) {
4312                                         fix_insert_line($fixlinenr, $fixedline);
4313                                 }
4314                                 $fixedline = $rawline;
4315                                 $fixedline =~ s/^(.\s*)else/$1} else/;
4316                                 fix_insert_line($fixlinenr, $fixedline);
4317                         }
4318                 }
4319
4320                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
4321                     $previndent == $indent) {
4322                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
4323
4324                         # Find out what is on the end of the line after the
4325                         # conditional.
4326                         substr($s, 0, length($c), '');
4327                         $s =~ s/\n.*//g;
4328
4329                         if ($s =~ /^\s*;/) {
4330                                 if (ERROR("WHILE_AFTER_BRACE",
4331                                           "while should follow close brace '}'\n" . $hereprev) &&
4332                                     $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4333                                         fix_delete_line($fixlinenr - 1, $prevrawline);
4334                                         fix_delete_line($fixlinenr, $rawline);
4335                                         my $fixedline = $prevrawline;
4336                                         my $trailing = $rawline;
4337                                         $trailing =~ s/^\+//;
4338                                         $trailing = trim($trailing);
4339                                         $fixedline =~ s/}\s*$/} $trailing/;
4340                                         fix_insert_line($fixlinenr, $fixedline);
4341                                 }
4342                         }
4343                 }
4344
4345 #Specific variable tests
4346                 while ($line =~ m{($Constant|$Lval)}g) {
4347                         my $var = $1;
4348
4349 #gcc binary extension
4350                         if ($var =~ /^$Binary$/) {
4351                                 if (WARN("GCC_BINARY_CONSTANT",
4352                                          "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
4353                                     $fix) {
4354                                         my $hexval = sprintf("0x%x", oct($var));
4355                                         $fixed[$fixlinenr] =~
4356                                             s/\b$var\b/$hexval/;
4357                                 }
4358                         }
4359
4360 #CamelCase
4361                         if ($var !~ /^$Constant$/ &&
4362                             $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
4363 #Ignore Page<foo> variants
4364                             $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
4365 #Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show)
4366                             $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/ &&
4367 #Ignore some three character SI units explicitly, like MiB and KHz
4368                             $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
4369                                 while ($var =~ m{($Ident)}g) {
4370                                         my $word = $1;
4371                                         next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
4372                                         if ($check) {
4373                                                 seed_camelcase_includes();
4374                                                 if (!$file && !$camelcase_file_seeded) {
4375                                                         seed_camelcase_file($realfile);
4376                                                         $camelcase_file_seeded = 1;
4377                                                 }
4378                                         }
4379                                         if (!defined $camelcase{$word}) {
4380                                                 $camelcase{$word} = 1;
4381                                                 CHK("CAMELCASE",
4382                                                     "Avoid CamelCase: <$word>\n" . $herecurr);
4383                                         }
4384                                 }
4385                         }
4386                 }
4387
4388 #no spaces allowed after \ in define
4389                 if ($line =~ /\#\s*define.*\\\s+$/) {
4390                         if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
4391                                  "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
4392                             $fix) {
4393                                 $fixed[$fixlinenr] =~ s/\s+$//;
4394                         }
4395                 }
4396
4397 # warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
4398 # itself <asm/foo.h> (uses RAW line)
4399                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
4400                         my $file = "$1.h";
4401                         my $checkfile = "include/linux/$file";
4402                         if (-f "$root/$checkfile" &&
4403                             $realfile ne $checkfile &&
4404                             $1 !~ /$allowed_asm_includes/)
4405                         {
4406                                 my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;
4407                                 if ($asminclude > 0) {
4408                                         if ($realfile =~ m{^arch/}) {
4409                                                 CHK("ARCH_INCLUDE_LINUX",
4410                                                     "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4411                                         } else {
4412                                                 WARN("INCLUDE_LINUX",
4413                                                      "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
4414                                         }
4415                                 }
4416                         }
4417                 }
4418
4419 # multi-statement macros should be enclosed in a do while loop, grab the
4420 # first statement and ensure its the whole macro if its not enclosed
4421 # in a known good container
4422                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
4423                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
4424                         my $ln = $linenr;
4425                         my $cnt = $realcnt;
4426                         my ($off, $dstat, $dcond, $rest);
4427                         my $ctx = '';
4428                         my $has_flow_statement = 0;
4429                         my $has_arg_concat = 0;
4430                         ($dstat, $dcond, $ln, $cnt, $off) =
4431                                 ctx_statement_block($linenr, $realcnt, 0);
4432                         $ctx = $dstat;
4433                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
4434                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
4435
4436                         $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
4437                         $has_arg_concat = 1 if ($ctx =~ /\#\#/);
4438
4439                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
4440                         $dstat =~ s/$;//g;
4441                         $dstat =~ s/\\\n.//g;
4442                         $dstat =~ s/^\s*//s;
4443                         $dstat =~ s/\s*$//s;
4444
4445                         # Flatten any parentheses and braces
4446                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
4447                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
4448                                $dstat =~ s/\[[^\[\]]*\]/1/)
4449                         {
4450                         }
4451
4452                         # Flatten any obvious string concatentation.
4453                         while ($dstat =~ s/($String)\s*$Ident/$1/ ||
4454                                $dstat =~ s/$Ident\s*($String)/$1/)
4455                         {
4456                         }
4457
4458                         my $exceptions = qr{
4459                                 $Declare|
4460                                 module_param_named|
4461                                 MODULE_PARM_DESC|
4462                                 DECLARE_PER_CPU|
4463                                 DEFINE_PER_CPU|
4464                                 __typeof__\(|
4465                                 union|
4466                                 struct|
4467                                 \.$Ident\s*=\s*|
4468                                 ^\"|\"$
4469                         }x;
4470                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
4471                         if ($dstat ne '' &&
4472                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
4473                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
4474                             $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&          # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
4475                             $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&                  # character constants
4476                             $dstat !~ /$exceptions/ &&
4477                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
4478                             $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
4479                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
4480                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
4481                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
4482                             $dstat !~ /^do\s*{/ &&                                      # do {...
4483                             $dstat !~ /^\({/ &&                                         # ({...
4484                             $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
4485                         {
4486                                 $ctx =~ s/\n*$//;
4487                                 my $herectx = $here . "\n";
4488                                 my $cnt = statement_rawlines($ctx);
4489
4490                                 for (my $n = 0; $n < $cnt; $n++) {
4491                                         $herectx .= raw_line($linenr, $n) . "\n";
4492                                 }
4493
4494                                 if ($dstat =~ /;/) {
4495                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
4496                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
4497                                 } else {
4498                                         ERROR("COMPLEX_MACRO",
4499                                               "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
4500                                 }
4501                         }
4502
4503 # check for macros with flow control, but without ## concatenation
4504 # ## concatenation is commonly a macro that defines a function so ignore those
4505                         if ($has_flow_statement && !$has_arg_concat) {
4506                                 my $herectx = $here . "\n";
4507                                 my $cnt = statement_rawlines($ctx);
4508
4509                                 for (my $n = 0; $n < $cnt; $n++) {
4510                                         $herectx .= raw_line($linenr, $n) . "\n";
4511                                 }
4512                                 WARN("MACRO_WITH_FLOW_CONTROL",
4513                                      "Macros with flow control statements should be avoided\n" . "$herectx");
4514                         }
4515
4516 # check for line continuations outside of #defines, preprocessor #, and asm
4517
4518                 } else {
4519                         if ($prevline !~ /^..*\\$/ &&
4520                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
4521                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
4522                             $line =~ /^\+.*\\$/) {
4523                                 WARN("LINE_CONTINUATIONS",
4524                                      "Avoid unnecessary line continuations\n" . $herecurr);
4525                         }
4526                 }
4527
4528 # do {} while (0) macro tests:
4529 # single-statement macros do not need to be enclosed in do while (0) loop,
4530 # macro should not end with a semicolon
4531                 if ($^V && $^V ge 5.10.0 &&
4532                     $realfile !~ m@/vmlinux.lds.h$@ &&
4533                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
4534                         my $ln = $linenr;
4535                         my $cnt = $realcnt;
4536                         my ($off, $dstat, $dcond, $rest);
4537                         my $ctx = '';
4538                         ($dstat, $dcond, $ln, $cnt, $off) =
4539                                 ctx_statement_block($linenr, $realcnt, 0);
4540                         $ctx = $dstat;
4541
4542                         $dstat =~ s/\\\n.//g;
4543                         $dstat =~ s/$;/ /g;
4544
4545                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
4546                                 my $stmts = $2;
4547                                 my $semis = $3;
4548
4549                                 $ctx =~ s/\n*$//;
4550                                 my $cnt = statement_rawlines($ctx);
4551                                 my $herectx = $here . "\n";
4552
4553                                 for (my $n = 0; $n < $cnt; $n++) {
4554                                         $herectx .= raw_line($linenr, $n) . "\n";
4555                                 }
4556
4557                                 if (($stmts =~ tr/;/;/) == 1 &&
4558                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
4559                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
4560                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
4561                                 }
4562                                 if (defined $semis && $semis ne "") {
4563                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
4564                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
4565                                 }
4566                         } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
4567                                 $ctx =~ s/\n*$//;
4568                                 my $cnt = statement_rawlines($ctx);
4569                                 my $herectx = $here . "\n";
4570
4571                                 for (my $n = 0; $n < $cnt; $n++) {
4572                                         $herectx .= raw_line($linenr, $n) . "\n";
4573                                 }
4574
4575                                 WARN("TRAILING_SEMICOLON",
4576                                      "macros should not use a trailing semicolon\n" . "$herectx");
4577                         }
4578                 }
4579
4580 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
4581 # all assignments may have only one of the following with an assignment:
4582 #       .
4583 #       ALIGN(...)
4584 #       VMLINUX_SYMBOL(...)
4585                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
4586                         WARN("MISSING_VMLINUX_SYMBOL",
4587                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
4588                 }
4589
4590 # check for redundant bracing round if etc
4591                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
4592                         my ($level, $endln, @chunks) =
4593                                 ctx_statement_full($linenr, $realcnt, 1);
4594                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
4595                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
4596                         if ($#chunks > 0 && $level == 0) {
4597                                 my @allowed = ();
4598                                 my $allow = 0;
4599                                 my $seen = 0;
4600                                 my $herectx = $here . "\n";
4601                                 my $ln = $linenr - 1;
4602                                 for my $chunk (@chunks) {
4603                                         my ($cond, $block) = @{$chunk};
4604
4605                                         # If the condition carries leading newlines, then count those as offsets.
4606                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
4607                                         my $offset = statement_rawlines($whitespace) - 1;
4608
4609                                         $allowed[$allow] = 0;
4610                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
4611
4612                                         # We have looked at and allowed this specific line.
4613                                         $suppress_ifbraces{$ln + $offset} = 1;
4614
4615                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
4616                                         $ln += statement_rawlines($block) - 1;
4617
4618                                         substr($block, 0, length($cond), '');
4619
4620                                         $seen++ if ($block =~ /^\s*{/);
4621
4622                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
4623                                         if (statement_lines($cond) > 1) {
4624                                                 #print "APW: ALLOWED: cond<$cond>\n";
4625                                                 $allowed[$allow] = 1;
4626                                         }
4627                                         if ($block =~/\b(?:if|for|while)\b/) {
4628                                                 #print "APW: ALLOWED: block<$block>\n";
4629                                                 $allowed[$allow] = 1;
4630                                         }
4631                                         if (statement_block_size($block) > 1) {
4632                                                 #print "APW: ALLOWED: lines block<$block>\n";
4633                                                 $allowed[$allow] = 1;
4634                                         }
4635                                         $allow++;
4636                                 }
4637                                 if ($seen) {
4638                                         my $sum_allowed = 0;
4639                                         foreach (@allowed) {
4640                                                 $sum_allowed += $_;
4641                                         }
4642                                         if ($sum_allowed == 0) {
4643                                                 WARN("BRACES",
4644                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
4645                                         } elsif ($sum_allowed != $allow &&
4646                                                  $seen != $allow) {
4647                                                 CHK("BRACES",
4648                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
4649                                         }
4650                                 }
4651                         }
4652                 }
4653                 if (!defined $suppress_ifbraces{$linenr - 1} &&
4654                                         $line =~ /\b(if|while|for|else)\b/) {
4655                         my $allowed = 0;
4656
4657                         # Check the pre-context.
4658                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
4659                                 #print "APW: ALLOWED: pre<$1>\n";
4660                                 $allowed = 1;
4661                         }
4662
4663                         my ($level, $endln, @chunks) =
4664                                 ctx_statement_full($linenr, $realcnt, $-[0]);
4665
4666                         # Check the condition.
4667                         my ($cond, $block) = @{$chunks[0]};
4668                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
4669                         if (defined $cond) {
4670                                 substr($block, 0, length($cond), '');
4671                         }
4672                         if (statement_lines($cond) > 1) {
4673                                 #print "APW: ALLOWED: cond<$cond>\n";
4674                                 $allowed = 1;
4675                         }
4676                         if ($block =~/\b(?:if|for|while)\b/) {
4677                                 #print "APW: ALLOWED: block<$block>\n";
4678                                 $allowed = 1;
4679                         }
4680                         if (statement_block_size($block) > 1) {
4681                                 #print "APW: ALLOWED: lines block<$block>\n";
4682                                 $allowed = 1;
4683                         }
4684                         # Check the post-context.
4685                         if (defined $chunks[1]) {
4686                                 my ($cond, $block) = @{$chunks[1]};
4687                                 if (defined $cond) {
4688                                         substr($block, 0, length($cond), '');
4689                                 }
4690                                 if ($block =~ /^\s*\{/) {
4691                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
4692                                         $allowed = 1;
4693                                 }
4694                         }
4695                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
4696                                 my $herectx = $here . "\n";
4697                                 my $cnt = statement_rawlines($block);
4698
4699                                 for (my $n = 0; $n < $cnt; $n++) {
4700                                         $herectx .= raw_line($linenr, $n) . "\n";
4701                                 }
4702
4703                                 WARN("BRACES",
4704                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
4705                         }
4706                 }
4707
4708 # check for unnecessary blank lines around braces
4709                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
4710                         if (CHK("BRACES",
4711                                 "Blank lines aren't necessary before a close brace '}'\n" . $hereprev) &&
4712                             $fix && $prevrawline =~ /^\+/) {
4713                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4714                         }
4715                 }
4716                 if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
4717                         if (CHK("BRACES",
4718                                 "Blank lines aren't necessary after an open brace '{'\n" . $hereprev) &&
4719                             $fix) {
4720                                 fix_delete_line($fixlinenr, $rawline);
4721                         }
4722                 }
4723
4724 # no volatiles please
4725                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
4726                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
4727                         WARN("VOLATILE",
4728                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
4729                 }
4730
4731 # Check for user-visible strings broken across lines, which breaks the ability
4732 # to grep for the string.  Make exceptions when the previous string ends in a
4733 # newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
4734 # (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
4735                 if ($line =~ /^\+\s*$String/ &&
4736                     $prevline =~ /"\s*$/ &&
4737                     $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
4738                         if (WARN("SPLIT_STRING",
4739                                  "quoted string split across lines\n" . $hereprev) &&
4740                                      $fix &&
4741                                      $prevrawline =~ /^\+.*"\s*$/ &&
4742                                      $last_coalesced_string_linenr != $linenr - 1) {
4743                                 my $extracted_string = get_quoted_string($line, $rawline);
4744                                 my $comma_close = "";
4745                                 if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
4746                                         $comma_close = $1;
4747                                 }
4748
4749                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4750                                 fix_delete_line($fixlinenr, $rawline);
4751                                 my $fixedline = $prevrawline;
4752                                 $fixedline =~ s/"\s*$//;
4753                                 $fixedline .= substr($extracted_string, 1) . trim($comma_close);
4754                                 fix_insert_line($fixlinenr - 1, $fixedline);
4755                                 $fixedline = $rawline;
4756                                 $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
4757                                 if ($fixedline !~ /\+\s*$/) {
4758                                         fix_insert_line($fixlinenr, $fixedline);
4759                                 }
4760                                 $last_coalesced_string_linenr = $linenr;
4761                         }
4762                 }
4763
4764 # check for missing a space in a string concatenation
4765                 if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
4766                         WARN('MISSING_SPACE',
4767                              "break quoted strings at a space character\n" . $hereprev);
4768                 }
4769
4770 # check for spaces before a quoted newline
4771                 if ($rawline =~ /^.*\".*\s\\n/) {
4772                         if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
4773                                  "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
4774                             $fix) {
4775                                 $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
4776                         }
4777
4778                 }
4779
4780 # concatenated string without spaces between elements
4781                 if ($line =~ /$String[A-Z_]/ || $line =~ /[A-Za-z0-9_]$String/) {
4782                         CHK("CONCATENATED_STRING",
4783                             "Concatenated strings should use spaces between elements\n" . $herecurr);
4784                 }
4785
4786 # uncoalesced string fragments
4787                 if ($line =~ /$String\s*"/) {
4788                         WARN("STRING_FRAGMENTS",
4789                              "Consecutive strings are generally better as a single string\n" . $herecurr);
4790                 }
4791
4792 # check for %L{u,d,i} in strings
4793                 my $string;
4794                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
4795                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
4796                         $string =~ s/%%/__/g;
4797                         if ($string =~ /(?<!%)%L[udi]/) {
4798                                 WARN("PRINTF_L",
4799                                      "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
4800                                 last;
4801                         }
4802                 }
4803
4804 # check for line continuations in quoted strings with odd counts of "
4805                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
4806                         WARN("LINE_CONTINUATIONS",
4807                              "Avoid line continuations in quoted strings\n" . $herecurr);
4808                 }
4809
4810 # warn about #if 0
4811                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
4812                         CHK("REDUNDANT_CODE",
4813                             "if this code is redundant consider removing it\n" .
4814                                 $herecurr);
4815                 }
4816
4817 # check for needless "if (<foo>) fn(<foo>)" uses
4818                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
4819                         my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
4820                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
4821                                 WARN('NEEDLESS_IF',
4822                                      "$1(NULL) is safe and this check is probably not required\n" . $hereprev);
4823                         }
4824                 }
4825
4826 # check for unnecessary "Out of Memory" messages
4827                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
4828                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
4829                     (defined $1 || defined $3) &&
4830                     $linenr > 3) {
4831                         my $testval = $2;
4832                         my $testline = $lines[$linenr - 3];
4833
4834                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
4835 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
4836
4837                         if ($c =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|(?:dev_)?alloc_skb)/) {
4838                                 WARN("OOM_MESSAGE",
4839                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
4840                         }
4841                 }
4842
4843 # check for logging functions with KERN_<LEVEL>
4844                 if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
4845                     $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
4846                         my $level = $1;
4847                         if (WARN("UNNECESSARY_KERN_LEVEL",
4848                                  "Possible unnecessary $level\n" . $herecurr) &&
4849                             $fix) {
4850                                 $fixed[$fixlinenr] =~ s/\s*$level\s*//;
4851                         }
4852                 }
4853
4854 # check for mask then right shift without a parentheses
4855                 if ($^V && $^V ge 5.10.0 &&
4856                     $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
4857                     $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
4858                         WARN("MASK_THEN_SHIFT",
4859                              "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
4860                 }
4861
4862 # check for pointer comparisons to NULL
4863                 if ($^V && $^V ge 5.10.0) {
4864                         while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
4865                                 my $val = $1;
4866                                 my $equal = "!";
4867                                 $equal = "" if ($4 eq "!=");
4868                                 if (CHK("COMPARISON_TO_NULL",
4869                                         "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
4870                                             $fix) {
4871                                         $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
4872                                 }
4873                         }
4874                 }
4875
4876 # check for bad placement of section $InitAttribute (e.g.: __initdata)
4877                 if ($line =~ /(\b$InitAttribute\b)/) {
4878                         my $attr = $1;
4879                         if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
4880                                 my $ptr = $1;
4881                                 my $var = $2;
4882                                 if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
4883                                       ERROR("MISPLACED_INIT",
4884                                             "$attr should be placed after $var\n" . $herecurr)) ||
4885                                      ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
4886                                       WARN("MISPLACED_INIT",
4887                                            "$attr should be placed after $var\n" . $herecurr))) &&
4888                                     $fix) {
4889                                         $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
4890                                 }
4891                         }
4892                 }
4893
4894 # check for $InitAttributeData (ie: __initdata) with const
4895                 if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
4896                         my $attr = $1;
4897                         $attr =~ /($InitAttributePrefix)(.*)/;
4898                         my $attr_prefix = $1;
4899                         my $attr_type = $2;
4900                         if (ERROR("INIT_ATTRIBUTE",
4901                                   "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
4902                             $fix) {
4903                                 $fixed[$fixlinenr] =~
4904                                     s/$InitAttributeData/${attr_prefix}initconst/;
4905                         }
4906                 }
4907
4908 # check for $InitAttributeConst (ie: __initconst) without const
4909                 if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
4910                         my $attr = $1;
4911                         if (ERROR("INIT_ATTRIBUTE",
4912                                   "Use of $attr requires a separate use of const\n" . $herecurr) &&
4913                             $fix) {
4914                                 my $lead = $fixed[$fixlinenr] =~
4915                                     /(^\+\s*(?:static\s+))/;
4916                                 $lead = rtrim($1);
4917                                 $lead = "$lead " if ($lead !~ /^\+$/);
4918                                 $lead = "${lead}const ";
4919                                 $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
4920                         }
4921                 }
4922
4923 # check for __read_mostly with const non-pointer (should just be const)
4924                 if ($line =~ /\b__read_mostly\b/ &&
4925                     $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) {
4926                         if (ERROR("CONST_READ_MOSTLY",
4927                                   "Invalid use of __read_mostly with const type\n" . $herecurr) &&
4928                             $fix) {
4929                                 $fixed[$fixlinenr] =~ s/\s+__read_mostly\b//;
4930                         }
4931                 }
4932
4933 # don't use __constant_<foo> functions outside of include/uapi/
4934                 if ($realfile !~ m@^include/uapi/@ &&
4935                     $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
4936                         my $constant_func = $1;
4937                         my $func = $constant_func;
4938                         $func =~ s/^__constant_//;
4939                         if (WARN("CONSTANT_CONVERSION",
4940                                  "$constant_func should be $func\n" . $herecurr) &&
4941                             $fix) {
4942                                 $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
4943                         }
4944                 }
4945
4946 # prefer usleep_range over udelay
4947                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
4948                         my $delay = $1;
4949                         # ignore udelay's < 10, however
4950                         if (! ($delay < 10) ) {
4951                                 CHK("USLEEP_RANGE",
4952                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4953                         }
4954                         if ($delay > 2000) {
4955                                 WARN("LONG_UDELAY",
4956                                      "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
4957                         }
4958                 }
4959
4960 # warn about unexpectedly long msleep's
4961                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
4962                         if ($1 < 20) {
4963                                 WARN("MSLEEP",
4964                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
4965                         }
4966                 }
4967
4968 # check for comparisons of jiffies
4969                 if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
4970                         WARN("JIFFIES_COMPARISON",
4971                              "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
4972                 }
4973
4974 # check for comparisons of get_jiffies_64()
4975                 if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
4976                         WARN("JIFFIES_COMPARISON",
4977                              "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
4978                 }
4979
4980 # warn about #ifdefs in C files
4981 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
4982 #                       print "#ifdef in C files should be avoided\n";
4983 #                       print "$herecurr";
4984 #                       $clean = 0;
4985 #               }
4986
4987 # warn about spacing in #ifdefs
4988                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
4989                         if (ERROR("SPACING",
4990                                   "exactly one space required after that #$1\n" . $herecurr) &&
4991                             $fix) {
4992                                 $fixed[$fixlinenr] =~
4993                                     s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
4994                         }
4995
4996                 }
4997
4998 # check for spinlock_t definitions without a comment.
4999                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
5000                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
5001                         my $which = $1;
5002                         if (!ctx_has_comment($first_line, $linenr)) {
5003                                 CHK("UNCOMMENTED_DEFINITION",
5004                                     "$1 definition without comment\n" . $herecurr);
5005                         }
5006                 }
5007 # check for memory barriers without a comment.
5008                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
5009                         if (!ctx_has_comment($first_line, $linenr)) {
5010                                 WARN("MEMORY_BARRIER",
5011                                      "memory barrier without comment\n" . $herecurr);
5012                         }
5013                 }
5014 # check for waitqueue_active without a comment.
5015                 if ($line =~ /\bwaitqueue_active\s*\(/) {
5016                         if (!ctx_has_comment($first_line, $linenr)) {
5017                                 WARN("WAITQUEUE_ACTIVE",
5018                                      "waitqueue_active without comment\n" . $herecurr);
5019                         }
5020                 }
5021 # check of hardware specific defines
5022                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
5023                         CHK("ARCH_DEFINES",
5024                             "architecture specific defines should be avoided\n" .  $herecurr);
5025                 }
5026
5027 # Check that the storage class is at the beginning of a declaration
5028                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
5029                         WARN("STORAGE_CLASS",
5030                              "storage class should be at the beginning of the declaration\n" . $herecurr)
5031                 }
5032
5033 # check the location of the inline attribute, that it is between
5034 # storage class and type.
5035                 if ($line =~ /\b$Type\s+$Inline\b/ ||
5036                     $line =~ /\b$Inline\s+$Storage\b/) {
5037                         ERROR("INLINE_LOCATION",
5038                               "inline keyword should sit between storage class and type\n" . $herecurr);
5039                 }
5040
5041 # Check for __inline__ and __inline, prefer inline
5042                 if ($realfile !~ m@\binclude/uapi/@ &&
5043                     $line =~ /\b(__inline__|__inline)\b/) {
5044                         if (WARN("INLINE",
5045                                  "plain inline is preferred over $1\n" . $herecurr) &&
5046                             $fix) {
5047                                 $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;
5048
5049                         }
5050                 }
5051
5052 # Check for __attribute__ packed, prefer __packed
5053                 if ($realfile !~ m@\binclude/uapi/@ &&
5054                     $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
5055                         WARN("PREFER_PACKED",
5056                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
5057                 }
5058
5059 # Check for __attribute__ aligned, prefer __aligned
5060                 if ($realfile !~ m@\binclude/uapi/@ &&
5061                     $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
5062                         WARN("PREFER_ALIGNED",
5063                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
5064                 }
5065
5066 # Check for __attribute__ format(printf, prefer __printf
5067                 if ($realfile !~ m@\binclude/uapi/@ &&
5068                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
5069                         if (WARN("PREFER_PRINTF",
5070                                  "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
5071                             $fix) {
5072                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
5073
5074                         }
5075                 }
5076
5077 # Check for __attribute__ format(scanf, prefer __scanf
5078                 if ($realfile !~ m@\binclude/uapi/@ &&
5079                     $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
5080                         if (WARN("PREFER_SCANF",
5081                                  "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
5082                             $fix) {
5083                                 $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
5084                         }
5085                 }
5086
5087 # Check for __attribute__ weak, or __weak declarations (may have link issues)
5088                 if ($^V && $^V ge 5.10.0 &&
5089                     $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
5090                     ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
5091                      $line =~ /\b__weak\b/)) {
5092                         ERROR("WEAK_DECLARATION",
5093                               "Using weak declarations can have unintended link defects\n" . $herecurr);
5094                 }
5095
5096 # check for c99 types like uint8_t used outside of uapi/
5097                 if ($realfile !~ m@\binclude/uapi/@ &&
5098                     $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) {
5099                         my $type = $1;
5100                         if ($type =~ /\b($typeC99Typedefs)\b/) {
5101                                 $type = $1;
5102                                 my $kernel_type = 'u';
5103                                 $kernel_type = 's' if ($type =~ /^_*[si]/);
5104                                 $type =~ /(\d+)/;
5105                                 $kernel_type .= $1;
5106                                 if (CHK("PREFER_KERNEL_TYPES",
5107                                         "Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) &&
5108                                     $fix) {
5109                                         $fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/;
5110                                 }
5111                         }
5112                 }
5113
5114 # check for sizeof(&)
5115                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
5116                         WARN("SIZEOF_ADDRESS",
5117                              "sizeof(& should be avoided\n" . $herecurr);
5118                 }
5119
5120 # check for sizeof without parenthesis
5121                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
5122                         if (WARN("SIZEOF_PARENTHESIS",
5123                                  "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
5124                             $fix) {
5125                                 $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
5126                         }
5127                 }
5128
5129 # check for struct spinlock declarations
5130                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
5131                         WARN("USE_SPINLOCK_T",
5132                              "struct spinlock should be spinlock_t\n" . $herecurr);
5133                 }
5134
5135 # check for seq_printf uses that could be seq_puts
5136                 if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
5137                         my $fmt = get_quoted_string($line, $rawline);
5138                         $fmt =~ s/%%//g;
5139                         if ($fmt !~ /%/) {
5140                                 if (WARN("PREFER_SEQ_PUTS",
5141                                          "Prefer seq_puts to seq_printf\n" . $herecurr) &&
5142                                     $fix) {
5143                                         $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
5144                                 }
5145                         }
5146                 }
5147
5148 # Check for misused memsets
5149                 if ($^V && $^V ge 5.10.0 &&
5150                     defined $stat &&
5151                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/) {
5152
5153                         my $ms_addr = $2;
5154                         my $ms_val = $7;
5155                         my $ms_size = $12;
5156
5157                         if ($ms_size =~ /^(0x|)0$/i) {
5158                                 ERROR("MEMSET",
5159                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
5160                         } elsif ($ms_size =~ /^(0x|)1$/i) {
5161                                 WARN("MEMSET",
5162                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
5163                         }
5164                 }
5165
5166 # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
5167                 if ($^V && $^V ge 5.10.0 &&
5168                     defined $stat &&
5169                     $stat =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
5170                         if (WARN("PREFER_ETHER_ADDR_COPY",
5171                                  "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . "$here\n$stat\n") &&
5172                             $fix) {
5173                                 $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
5174                         }
5175                 }
5176
5177 # Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar)
5178                 if ($^V && $^V ge 5.10.0 &&
5179                     defined $stat &&
5180                     $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
5181                         WARN("PREFER_ETHER_ADDR_EQUAL",
5182                              "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
5183                 }
5184
5185 # check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
5186 # check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
5187                 if ($^V && $^V ge 5.10.0 &&
5188                     defined $stat &&
5189                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
5190
5191                         my $ms_val = $7;
5192
5193                         if ($ms_val =~ /^(?:0x|)0+$/i) {
5194                                 if (WARN("PREFER_ETH_ZERO_ADDR",
5195                                          "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") &&
5196                                     $fix) {
5197                                         $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/;
5198                                 }
5199                         } elsif ($ms_val =~ /^(?:0xff|255)$/i) {
5200                                 if (WARN("PREFER_ETH_BROADCAST_ADDR",
5201                                          "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") &&
5202                                     $fix) {
5203                                         $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/;
5204                                 }
5205                         }
5206                 }
5207
5208 # typecasts on min/max could be min_t/max_t
5209                 if ($^V && $^V ge 5.10.0 &&
5210                     defined $stat &&
5211                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
5212                         if (defined $2 || defined $7) {
5213                                 my $call = $1;
5214                                 my $cast1 = deparenthesize($2);
5215                                 my $arg1 = $3;
5216                                 my $cast2 = deparenthesize($7);
5217                                 my $arg2 = $8;
5218                                 my $cast;
5219
5220                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
5221                                         $cast = "$cast1 or $cast2";
5222                                 } elsif ($cast1 ne "") {
5223                                         $cast = $cast1;
5224                                 } else {
5225                                         $cast = $cast2;
5226                                 }
5227                                 WARN("MINMAX",
5228                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
5229                         }
5230                 }
5231
5232 # check usleep_range arguments
5233                 if ($^V && $^V ge 5.10.0 &&
5234                     defined $stat &&
5235                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
5236                         my $min = $1;
5237                         my $max = $7;
5238                         if ($min eq $max) {
5239                                 WARN("USLEEP_RANGE",
5240                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
5241                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
5242                                  $min > $max) {
5243                                 WARN("USLEEP_RANGE",
5244                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
5245                         }
5246                 }
5247
5248 # check for naked sscanf
5249                 if ($^V && $^V ge 5.10.0 &&
5250                     defined $stat &&
5251                     $line =~ /\bsscanf\b/ &&
5252                     ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
5253                      $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
5254                      $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
5255                         my $lc = $stat =~ tr@\n@@;
5256                         $lc = $lc + $linenr;
5257                         my $stat_real = raw_line($linenr, 0);
5258                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
5259                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
5260                         }
5261                         WARN("NAKED_SSCANF",
5262                              "unchecked sscanf return value\n" . "$here\n$stat_real\n");
5263                 }
5264
5265 # check for simple sscanf that should be kstrto<foo>
5266                 if ($^V && $^V ge 5.10.0 &&
5267                     defined $stat &&
5268                     $line =~ /\bsscanf\b/) {
5269                         my $lc = $stat =~ tr@\n@@;
5270                         $lc = $lc + $linenr;
5271                         my $stat_real = raw_line($linenr, 0);
5272                         for (my $count = $linenr + 1; $count <= $lc; $count++) {
5273                                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
5274                         }
5275                         if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
5276                                 my $format = $6;
5277                                 my $count = $format =~ tr@%@%@;
5278                                 if ($count == 1 &&
5279                                     $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
5280                                         WARN("SSCANF_TO_KSTRTO",
5281                                              "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
5282                                 }
5283                         }
5284                 }
5285
5286 # check for new externs in .h files.
5287                 if ($realfile =~ /\.h$/ &&
5288                     $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
5289                         if (CHK("AVOID_EXTERNS",
5290                                 "extern prototypes should be avoided in .h files\n" . $herecurr) &&
5291                             $fix) {
5292                                 $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
5293                         }
5294                 }
5295
5296 # check for new externs in .c files.
5297                 if ($realfile =~ /\.c$/ && defined $stat &&
5298                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
5299                 {
5300                         my $function_name = $1;
5301                         my $paren_space = $2;
5302
5303                         my $s = $stat;
5304                         if (defined $cond) {
5305                                 substr($s, 0, length($cond), '');
5306                         }
5307                         if ($s =~ /^\s*;/ &&
5308                             $function_name ne 'uninitialized_var')
5309                         {
5310                                 WARN("AVOID_EXTERNS",
5311                                      "externs should be avoided in .c files\n" .  $herecurr);
5312                         }
5313
5314                         if ($paren_space =~ /\n/) {
5315                                 WARN("FUNCTION_ARGUMENTS",
5316                                      "arguments for function declarations should follow identifier\n" . $herecurr);
5317                         }
5318
5319                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
5320                     $stat =~ /^.\s*extern\s+/)
5321                 {
5322                         WARN("AVOID_EXTERNS",
5323                              "externs should be avoided in .c files\n" .  $herecurr);
5324                 }
5325
5326 # checks for new __setup's
5327                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
5328                         my $name = $1;
5329
5330                         if (!grep(/$name/, @setup_docs)) {
5331                                 CHK("UNDOCUMENTED_SETUP",
5332                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
5333                         }
5334                 }
5335
5336 # check for pointless casting of kmalloc return
5337                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
5338                         WARN("UNNECESSARY_CASTS",
5339                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
5340                 }
5341
5342 # alloc style
5343 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
5344                 if ($^V && $^V ge 5.10.0 &&
5345                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
5346                         CHK("ALLOC_SIZEOF_STRUCT",
5347                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
5348                 }
5349
5350 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
5351                 if ($^V && $^V ge 5.10.0 &&
5352                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
5353                         my $oldfunc = $3;
5354                         my $a1 = $4;
5355                         my $a2 = $10;
5356                         my $newfunc = "kmalloc_array";
5357                         $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
5358                         my $r1 = $a1;
5359                         my $r2 = $a2;
5360                         if ($a1 =~ /^sizeof\s*\S/) {
5361                                 $r1 = $a2;
5362                                 $r2 = $a1;
5363                         }
5364                         if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
5365                             !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
5366                                 if (WARN("ALLOC_WITH_MULTIPLY",
5367                                          "Prefer $newfunc over $oldfunc with multiply\n" . $herecurr) &&
5368                                     $fix) {
5369                                         $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
5370
5371                                 }
5372                         }
5373                 }
5374
5375 # check for krealloc arg reuse
5376                 if ($^V && $^V ge 5.10.0 &&
5377                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
5378                         WARN("KREALLOC_ARG_REUSE",
5379                              "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
5380                 }
5381
5382 # check for alloc argument mismatch
5383                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
5384                         WARN("ALLOC_ARRAY_ARGS",
5385                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
5386                 }
5387
5388 # check for multiple semicolons
5389                 if ($line =~ /;\s*;\s*$/) {
5390                         if (WARN("ONE_SEMICOLON",
5391                                  "Statements terminations use 1 semicolon\n" . $herecurr) &&
5392                             $fix) {
5393                                 $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
5394                         }
5395                 }
5396
5397 # check for #defines like: 1 << <digit> that could be BIT(digit)
5398                 if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
5399                         my $ull = "";
5400                         $ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
5401                         if (CHK("BIT_MACRO",
5402                                 "Prefer using the BIT$ull macro\n" . $herecurr) &&
5403                             $fix) {
5404                                 $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
5405                         }
5406                 }
5407
5408 # check for case / default statements not preceded by break/fallthrough/switch
5409                 if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
5410                         my $has_break = 0;
5411                         my $has_statement = 0;
5412                         my $count = 0;
5413                         my $prevline = $linenr;
5414                         while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
5415                                 $prevline--;
5416                                 my $rline = $rawlines[$prevline - 1];
5417                                 my $fline = $lines[$prevline - 1];
5418                                 last if ($fline =~ /^\@\@/);
5419                                 next if ($fline =~ /^\-/);
5420                                 next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
5421                                 $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
5422                                 next if ($fline =~ /^.[\s$;]*$/);
5423                                 $has_statement = 1;
5424                                 $count++;
5425                                 $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|return\b|goto\b|continue\b)/);
5426                         }
5427                         if (!$has_break && $has_statement) {
5428                                 WARN("MISSING_BREAK",
5429                                      "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr);
5430                         }
5431                 }
5432
5433 # check for switch/default statements without a break;
5434                 if ($^V && $^V ge 5.10.0 &&
5435                     defined $stat &&
5436                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
5437                         my $ctx = '';
5438                         my $herectx = $here . "\n";
5439                         my $cnt = statement_rawlines($stat);
5440                         for (my $n = 0; $n < $cnt; $n++) {
5441                                 $herectx .= raw_line($linenr, $n) . "\n";
5442                         }
5443                         WARN("DEFAULT_NO_BREAK",
5444                              "switch default: should use break\n" . $herectx);
5445                 }
5446
5447 # check for gcc specific __FUNCTION__
5448                 if ($line =~ /\b__FUNCTION__\b/) {
5449                         if (WARN("USE_FUNC",
5450                                  "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
5451                             $fix) {
5452                                 $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
5453                         }
5454                 }
5455
5456 # check for uses of __DATE__, __TIME__, __TIMESTAMP__
5457                 while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
5458                         ERROR("DATE_TIME",
5459                               "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
5460                 }
5461
5462 # check for use of yield()
5463                 if ($line =~ /\byield\s*\(\s*\)/) {
5464                         WARN("YIELD",
5465                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
5466                 }
5467
5468 # check for comparisons against true and false
5469                 if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
5470                         my $lead = $1;
5471                         my $arg = $2;
5472                         my $test = $3;
5473                         my $otype = $4;
5474                         my $trail = $5;
5475                         my $op = "!";
5476
5477                         ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);
5478
5479                         my $type = lc($otype);
5480                         if ($type =~ /^(?:true|false)$/) {
5481                                 if (("$test" eq "==" && "$type" eq "true") ||
5482                                     ("$test" eq "!=" && "$type" eq "false")) {
5483                                         $op = "";
5484                                 }
5485
5486                                 CHK("BOOL_COMPARISON",
5487                                     "Using comparison to $otype is error prone\n" . $herecurr);
5488
5489 ## maybe suggesting a correct construct would better
5490 ##                                  "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);
5491
5492                         }
5493                 }
5494
5495 # check for semaphores initialized locked
5496                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
5497                         WARN("CONSIDER_COMPLETION",
5498                              "consider using a completion\n" . $herecurr);
5499                 }
5500
5501 # recommend kstrto* over simple_strto* and strict_strto*
5502                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
5503                         WARN("CONSIDER_KSTRTO",
5504                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
5505                 }
5506
5507 # check for __initcall(), use device_initcall() explicitly or more appropriate function please
5508                 if ($line =~ /^.\s*__initcall\s*\(/) {
5509                         WARN("USE_DEVICE_INITCALL",
5510                              "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
5511                 }
5512
5513 # check for various structs that are normally const (ops, kgdb, device_tree)
5514                 my $const_structs = qr{
5515                                 acpi_dock_ops|
5516                                 address_space_operations|
5517                                 backlight_ops|
5518                                 block_device_operations|
5519                                 dentry_operations|
5520                                 dev_pm_ops|
5521                                 dma_map_ops|
5522                                 extent_io_ops|
5523                                 file_lock_operations|
5524                                 file_operations|
5525                                 hv_ops|
5526                                 ide_dma_ops|
5527                                 intel_dvo_dev_ops|
5528                                 item_operations|
5529                                 iwl_ops|
5530                                 kgdb_arch|
5531                                 kgdb_io|
5532                                 kset_uevent_ops|
5533                                 lock_manager_operations|
5534                                 microcode_ops|
5535                                 mtrr_ops|
5536                                 neigh_ops|
5537                                 nlmsvc_binding|
5538                                 of_device_id|
5539                                 pci_raw_ops|
5540                                 pipe_buf_operations|
5541                                 platform_hibernation_ops|
5542                                 platform_suspend_ops|
5543                                 proto_ops|
5544                                 rpc_pipe_ops|
5545                                 seq_operations|
5546                                 snd_ac97_build_ops|
5547                                 soc_pcmcia_socket_ops|
5548                                 stacktrace_ops|
5549                                 sysfs_ops|
5550                                 tty_operations|
5551                                 uart_ops|
5552                                 usb_mon_operations|
5553                                 wd_ops}x;
5554                 if ($line !~ /\bconst\b/ &&
5555                     $line =~ /\bstruct\s+($const_structs)\b/) {
5556                         WARN("CONST_STRUCT",
5557                              "struct $1 should normally be const\n" .
5558                                 $herecurr);
5559                 }
5560
5561 # use of NR_CPUS is usually wrong
5562 # ignore definitions of NR_CPUS and usage to define arrays as likely right
5563                 if ($line =~ /\bNR_CPUS\b/ &&
5564                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
5565                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
5566                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
5567                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
5568                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
5569                 {
5570                         WARN("NR_CPUS",
5571                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
5572                 }
5573
5574 # Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
5575                 if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
5576                         ERROR("DEFINE_ARCH_HAS",
5577                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
5578                 }
5579
5580 # likely/unlikely comparisons similar to "(likely(foo) > 0)"
5581                 if ($^V && $^V ge 5.10.0 &&
5582                     $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
5583                         WARN("LIKELY_MISUSE",
5584                              "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
5585                 }
5586
5587 # whine mightly about in_atomic
5588                 if ($line =~ /\bin_atomic\s*\(/) {
5589                         if ($realfile =~ m@^drivers/@) {
5590                                 ERROR("IN_ATOMIC",
5591                                       "do not use in_atomic in drivers\n" . $herecurr);
5592                         } elsif ($realfile !~ m@^kernel/@) {
5593                                 WARN("IN_ATOMIC",
5594                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
5595                         }
5596                 }
5597
5598 # check for lockdep_set_novalidate_class
5599                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
5600                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
5601                         if ($realfile !~ m@^kernel/lockdep@ &&
5602                             $realfile !~ m@^include/linux/lockdep@ &&
5603                             $realfile !~ m@^drivers/base/core@) {
5604                                 ERROR("LOCKDEP",
5605                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
5606                         }
5607                 }
5608
5609                 if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ ||
5610                     $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) {
5611                         WARN("EXPORTED_WORLD_WRITABLE",
5612                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5613                 }
5614
5615 # Mode permission misuses where it seems decimal should be octal
5616 # This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
5617                 if ($^V && $^V ge 5.10.0 &&
5618                     $line =~ /$mode_perms_search/) {
5619                         foreach my $entry (@mode_permission_funcs) {
5620                                 my $func = $entry->[0];
5621                                 my $arg_pos = $entry->[1];
5622
5623                                 my $skip_args = "";
5624                                 if ($arg_pos > 1) {
5625                                         $arg_pos--;
5626                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
5627                                 }
5628                                 my $test = "\\b$func\\s*\\(${skip_args}([\\d]+)\\s*[,\\)]";
5629                                 if ($line =~ /$test/) {
5630                                         my $val = $1;
5631                                         $val = $6 if ($skip_args ne "");
5632
5633                                         if ($val !~ /^0$/ &&
5634                                             (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
5635                                              length($val) ne 4)) {
5636                                                 ERROR("NON_OCTAL_PERMISSIONS",
5637                                                       "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
5638                                         } elsif ($val =~ /^$Octal$/ && (oct($val) & 02)) {
5639                                                 ERROR("EXPORTED_WORLD_WRITABLE",
5640                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
5641                                         }
5642                                 }
5643                         }
5644                 }
5645
5646 # validate content of MODULE_LICENSE against list from include/linux/module.h
5647                 if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {
5648                         my $extracted_string = get_quoted_string($line, $rawline);
5649                         my $valid_licenses = qr{
5650                                                 GPL|
5651                                                 GPL\ v2|
5652                                                 GPL\ and\ additional\ rights|
5653                                                 Dual\ BSD/GPL|
5654                                                 Dual\ MIT/GPL|
5655                                                 Dual\ MPL/GPL|
5656                                                 Proprietary
5657                                         }x;
5658                         if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
5659                                 WARN("MODULE_LICENSE",
5660                                      "unknown module license " . $extracted_string . "\n" . $herecurr);
5661                         }
5662                 }
5663         }
5664
5665         # If we have no input at all, then there is nothing to report on
5666         # so just keep quiet.
5667         if ($#rawlines == -1) {
5668                 exit(0);
5669         }
5670
5671         # In mailback mode only produce a report in the negative, for
5672         # things that appear to be patches.
5673         if ($mailback && ($clean == 1 || !$is_patch)) {
5674                 exit(0);
5675         }
5676
5677         # This is not a patch, and we are are in 'no-patch' mode so
5678         # just keep quiet.
5679         if (!$chk_patch && !$is_patch) {
5680                 exit(0);
5681         }
5682
5683         if (!$is_patch && $file !~ /cover-letter\.patch$/) {
5684                 ERROR("NOT_UNIFIED_DIFF",
5685                       "Does not appear to be a unified-diff format patch\n");
5686         }
5687         if ($is_patch && $filename ne '-' && $chk_signoff && $signoff == 0) {
5688                 ERROR("MISSING_SIGN_OFF",
5689                       "Missing Signed-off-by: line(s)\n");
5690         }
5691
5692         print report_dump();
5693         if ($summary && !($clean == 1 && $quiet == 1)) {
5694                 print "$filename " if ($summary_file);
5695                 print "total: $cnt_error errors, $cnt_warn warnings, " .
5696                         (($check)? "$cnt_chk checks, " : "") .
5697                         "$cnt_lines lines checked\n";
5698         }
5699
5700         if ($quiet == 0) {
5701                 # If there were whitespace errors which cleanpatch can fix
5702                 # then suggest that.
5703                 if ($rpt_cleaners) {
5704                         $rpt_cleaners = 0;
5705                         print << "EOM"
5706
5707 NOTE: Whitespace errors detected.
5708       You may wish to use scripts/cleanpatch or scripts/cleanfile
5709 EOM
5710                 }
5711         }
5712
5713         if ($clean == 0 && $fix &&
5714             ("@rawlines" ne "@fixed" ||
5715              $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
5716                 my $newfile = $filename;
5717                 $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
5718                 my $linecount = 0;
5719                 my $f;
5720
5721                 @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);
5722
5723                 open($f, '>', $newfile)
5724                     or die "$P: Can't open $newfile for write\n";
5725                 foreach my $fixed_line (@fixed) {
5726                         $linecount++;
5727                         if ($file) {
5728                                 if ($linecount > 3) {
5729                                         $fixed_line =~ s/^\+//;
5730                                         print $f $fixed_line . "\n";
5731                                 }
5732                         } else {
5733                                 print $f $fixed_line . "\n";
5734                         }
5735                 }
5736                 close($f);
5737
5738                 if (!$quiet) {
5739                         print << "EOM";
5740
5741 Wrote EXPERIMENTAL --fix correction(s) to '$newfile'
5742
5743 Do _NOT_ trust the results written to this file.
5744 Do _NOT_ submit these changes without inspecting them for correctness.
5745
5746 This EXPERIMENTAL file is simply a convenience to help rewrite patches.
5747 No warranties, expressed or implied...
5748 EOM
5749                 }
5750         }
5751
5752         if ($quiet == 0) {
5753                 print "\n";
5754                 if ($clean == 1) {
5755                         print "$vname has no obvious style problems and is ready for submission.\n";
5756                 } else {
5757                         print "$vname has style problems, please review.\n";
5758                 }
5759         }
5760         return $clean;
5761 }