/*
* linux/kernel/panic.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/

/*
* This function is used through-out the kernel (including mm and fs)
* to indicate a major problem.
*
#include linux /config.h
#include linux /module.h
#include linux /sched.h
#include linux /delay.h
#includelinux /reboot.h
#include linux /notifier.h
#include linux /init.h
#include linux /sysrq.h
#include linux /interrupt.h
#include linux /nmi.h
#include linx/kexec.h

int panic_timeout;
int panic_on_oops;
int tainted;

EXPORT_SYMBOL(panic_timeout);

struct notifier_block *panic_notifier_list;

EXPORT_SYMBOL(panic_notifier_list);

static int __init panic_setup(char *str)
{
panic_timeout = simple_strtoul(str, NULL, 0);
return 1;
}
__setup(“panic=”, panic_setup);

static long no_blink(long time)
{
return 0;
}

/* Returns how long it waited in ms */
long (*panic_blink)(long time);
EXPORT_SYMBOL(panic_blink);

/**
* panic – halt the system
* @fmt: The text string to print
*
* Display a message, then perform cleanups.
*
* This function never returns.
*/

NORET_TYPE void panic(const char * fmt, …)
{
long i;
static char buf[1024];
va_list args;
#if defined(CONFIG_ARCH_S390)
unsigned long caller = (unsigned long) __builtin_return_address(0);
#endif

/*
* It’s possible to come here directly from a panic-assertion and not
* have preempt disabled. Some functions called from here want
* preempt to be disabled. No point enabling it later though…
*/
preempt_disable();

bust_spinlocks(1);
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
printk(KERN_EMERG “Kernel panic – not syncing: %s\n”,buf);
bust_spinlocks(0);

/*
* If we have crashed and we have a crash kernel loaded let it handle
* everything else.
* Do we want to call this before we try to display a message?
*/
crash_kexec(NULL);

#ifdef CONFIG_SMP
/*
* Note smp_send_stop is the usual smp shutdown function, which
* unfortunately means it may not be hardened to work in a panic
* situation.
*/
smp_send_stop();
#endif

notifier_call_chain(&panic_notifier_list, 0, buf);

if (!panic_blink)
panic_blink = no_blink;