/* * 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/sched.h> #include <linux/delay.h> #include <linux/reboot.h> #include <linux/notifier.h> #include <linux/init.h> #include <linux/sysrq.h> #include <linux/interrupt.h> asmlinkage void sys_sync(void); /* it's really int */ extern void unblank_console(void); int panic_timeout; struct notifier_block *panic_notifier_list; 27 static int __init panic_setup(char *str) { panic_timeout = simple_strtoul(str, NULL, 0); 30 return 1; } __setup("panic=", panic_setup); /** * panic - halt the system * @fmt: The text string to print * * Display a message, then unblank the console and perform * cleanups. Functions in the panic notifier list are called * after the filesystem cache is flushed (when possible). * * This function never returns. */ 46 NORET_TYPE void panic(const char * fmt, ...) { static char buf[1024]; va_list args; #if defined(CONFIG_ARCH_S390) unsigned long caller = (unsigned long) __builtin_return_address(0); #endif va_start(args, fmt); vsprintf(buf, fmt, args); va_end(args); printk(KERN_EMERG "Kernel panic: %s\n",buf); 58 if (in_interrupt()) printk(KERN_EMERG "In interrupt handler - not syncing\n"); 60 else if (!current->pid) printk(KERN_EMERG "In idle task - not syncing\n"); 62 else sys_sync(); unblank_console(); #ifdef CONFIG_SMP smp_send_stop(); #endif notifier_call_chain(&panic_notifier_list, 0, NULL); 73 if (panic_timeout > 0) { /* * Delay timeout seconds before rebooting the machine. * We can't use the "normal" timers since we just panicked.. */ printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout); mdelay(panic_timeout*1000); /* * Should we run the reboot notifier. For the moment Im * choosing not too. It might crash, be corrupt or do * more harm than good for other reasons. */ machine_restart(NULL); } #ifdef __sparc__ { extern int stop_a_enabled; /* Make sure the user can actually press L1-A */ stop_a_enabled = 1; printk("Press L1-A to return to the boot prom\n"); } #endif #if defined(CONFIG_ARCH_S390) disabled_wait(caller); #endif sti(); 100 for(;;) { CHECK_EMERGENCY_SYNC } }