arch/alpha/include/asm/cmpxchg.h

   1 #ifndef _ALPHA_CMPXCHG_H
   2 #define _ALPHA_CMPXCHG_H
   3
   4 /*
   5  * Atomic exchange routines.
   6  */
   7
   8 #define __ASM__MB
   9 #define ____xchg(type, args...)         __xchg ## type ## _local(args)
  10 #define ____cmpxchg(type, args...)      __cmpxchg ## type ## _local(args)
  11 #include <asm/xchg.h>
  12
  13 #define xchg_local(ptr, x)                                              \
  14 ({                                                                      \
  15         __typeof__(*(ptr)) _x_ = (x);                                   \
  16         (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,    \
  17                                        sizeof(*(ptr)));                 \
  18 })
  19
  20 #define cmpxchg_local(ptr, o, n)                                        \
  21 ({                                                                      \
  22         __typeof__(*(ptr)) _o_ = (o);                                   \
  23         __typeof__(*(ptr)) _n_ = (n);                                   \
  24         (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
  25                                           (unsigned long)_n_,           \
  26                                           sizeof(*(ptr)));              \
  27 })
  28
  29 #define cmpxchg64_local(ptr, o, n)                                      \
  30 ({                                                                      \
  31         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  32         cmpxchg_local((ptr), (o), (n));                                 \
  33 })
  34
  35 #ifdef CONFIG_SMP
  36 #undef __ASM__MB
  37 #define __ASM__MB       "\tmb\n"
  38 #endif
  39 #undef ____xchg
  40 #undef ____cmpxchg
  41 #define ____xchg(type, args...)         __xchg ##type(args)
  42 #define ____cmpxchg(type, args...)      __cmpxchg ##type(args)
  43 #include <asm/xchg.h>
  44
  45 #define xchg(ptr, x)                                                    \
  46 ({                                                                      \
  47         __typeof__(*(ptr)) _x_ = (x);                                   \
  48         (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_,          \
  49                                  sizeof(*(ptr)));                       \
  50 })
  51
  52 #define cmpxchg(ptr, o, n)                                              \
  53 ({                                                                      \
  54         __typeof__(*(ptr)) _o_ = (o);                                   \
  55         __typeof__(*(ptr)) _n_ = (n);                                   \
  56         (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,       \
  57                                     (unsigned long)_n_, sizeof(*(ptr)));\
  58 })
  59
  60 #define cmpxchg64(ptr, o, n)                                            \
  61 ({                                                                      \
  62         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  63         cmpxchg((ptr), (o), (n));                                       \
  64 })
  65
  66 #undef __ASM__MB
  67 #undef ____cmpxchg
  68
  69 #endif /* _ALPHA_CMPXCHG_H */