diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/kernel/panic.c')
-rw-r--r-- | xenolinux-2.4.21-pre4-sparse/kernel/panic.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/kernel/panic.c b/xenolinux-2.4.21-pre4-sparse/kernel/panic.c new file mode 100644 index 0000000000..90a782e6b5 --- /dev/null +++ b/xenolinux-2.4.21-pre4-sparse/kernel/panic.c @@ -0,0 +1,149 @@ +/* + * 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 */ + +int panic_timeout; + +struct notifier_block *panic_notifier_list; + +static int __init panic_setup(char *str) +{ + panic_timeout = simple_strtoul(str, NULL, 0); + return 1; +} + +__setup("panic=", panic_setup); + +/** + * panic - halt the system + * @fmt: The text string to print + * + * Display a message, then perform cleanups. Functions in the panic + * notifier list are called after the filesystem cache is flushed (when possible). + * + * This function never returns. + */ + +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 + + bust_spinlocks(1); + va_start(args, fmt); + vsprintf(buf, fmt, args); + va_end(args); + printk(KERN_EMERG "Kernel panic: %s\n",buf); + if (in_interrupt()) + printk(KERN_EMERG "In interrupt handler - not syncing\n"); + else if (!current->pid) + printk(KERN_EMERG "In idle task - not syncing\n"); + else + sys_sync(); + bust_spinlocks(0); + +#ifdef CONFIG_SMP + smp_send_stop(); +#endif + + notifier_call_chain(&panic_notifier_list, 0, NULL); + + 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(); + for(;;) { +#if defined(CONFIG_X86) && defined(CONFIG_VT) + extern void panic_blink(void); + panic_blink(); +#endif + CHECK_EMERGENCY_SYNC +#if defined(CONFIG_XENO) + HYPERVISOR_exit(); +#endif + } +} + +/** + * print_tainted - return a string to represent the kernel taint state. + * + * The string is overwritten by the next call to print_taint(). + */ + +const char *print_tainted() +{ + static char buf[20]; + if (tainted) { + snprintf(buf, sizeof(buf), "Tainted: %c%c", + tainted & 1 ? 'P' : 'G', + tainted & 2 ? 'F' : ' '); + } + else + snprintf(buf, sizeof(buf), "Not tainted"); + return(buf); +} + +int tainted = 0; + +/* + * A BUG() call in an inline function in a header should be avoided, + * because it can seriously bloat the kernel. So here we have + * helper functions. + * We lose the BUG()-time file-and-line info this way, but it's + * usually not very useful from an inline anyway. The backtrace + * tells us what we want to know. + */ + +void __out_of_line_bug(int line) +{ + printk("kernel BUG in header file at line %d\n", line); + + BUG(); + + /* Satisfy __attribute__((noreturn)) */ + for ( ; ; ) + ; +} |