Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm

[linux-drm-fsl-dcu.git] / init / main.c

diff --git a/init/main.c b/init/main.c
index 913e48d658ee1de1938edf62dfee2d497b02448f..1174ae3aec8c0741f7ec3303c241816613ce3ff0 100644 (file)
--- a/init/main.c
+++ b/init/main.c
@@ -9,8 +9,6 @@
  *  Simplified starting of init:  Michael A. Griffith <grif@acm.org> 
  */
 
-#define __KERNEL_SYSCALLS__
-
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/proc_fs.h>
@@ -31,6 +29,7 @@
 #include <linux/percpu.h>
 #include <linux/kmod.h>
 #include <linux/kernel_stat.h>
+#include <linux/start_kernel.h>
 #include <linux/security.h>
 #include <linux/workqueue.h>
 #include <linux/profile.h>
@@ -75,6 +74,10 @@
 #error Sorry, your GCC is too old. It builds incorrect kernels.
 #endif
 
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
+#warning gcc-4.1.0 is known to miscompile the kernel.  A different compiler version is recommended.
+#endif
+
 static int init(void *);
 
 extern void init_IRQ(void);
@@ -127,6 +130,18 @@ static char *ramdisk_execute_command;
 /* Setup configured maximum number of CPUs to activate */
 static unsigned int max_cpus = NR_CPUS;
 
+/*
+ * If set, this is an indication to the drivers that reset the underlying
+ * device before going ahead with the initialization otherwise driver might
+ * rely on the BIOS and skip the reset operation.
+ *
+ * This is useful if kernel is booting in an unreliable environment.
+ * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
+ * skipped and devices will be in unknown state.
+ */
+unsigned int reset_devices;
+EXPORT_SYMBOL(reset_devices);
+
 /*
  * Setup routine for controlling SMP activation
  *
@@ -153,6 +168,14 @@ static int __init maxcpus(char *str)
 
 __setup("maxcpus=", maxcpus);
 
+static int __init set_reset_devices(char *str)
+{
+       reset_devices = 1;
+       return 1;
+}
+
+__setup("reset_devices", set_reset_devices);
+
 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
 char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
 static const char *panic_later, *panic_param;
@@ -485,6 +508,7 @@ asmlinkage void __init start_kernel(void)
        printk(KERN_NOTICE);
        printk(linux_banner);
        setup_arch(&command_line);
+       unwind_setup();
        setup_per_cpu_areas();
        smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
@@ -683,7 +707,7 @@ static void do_pre_smp_initcalls(void)
 static void run_init_process(char *init_filename)
 {
        argv_init[0] = init_filename;
-       execve(init_filename, argv_init, envp_init);
+       kernel_execve(init_filename, argv_init, envp_init);
 }
 
 static int init(void * unused)
@@ -703,6 +727,8 @@ static int init(void * unused)
         */
        child_reaper = current;
 
+       cad_pid = task_pid(current);
+
        smp_prepare_cpus(max_cpus);
 
        do_pre_smp_initcalls();