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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /kernel/panic.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'kernel/panic.c')
-rw-r--r-- | kernel/panic.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c new file mode 100644 index 000000000000..0fa3f3a66fb6 --- /dev/null +++ b/kernel/panic.c @@ -0,0 +1,157 @@ +/* + * 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> +#include <linux/reboot.h> +#include <linux/notifier.h> +#include <linux/init.h> +#include <linux/sysrq.h> +#include <linux/interrupt.h> +#include <linux/nmi.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 + + 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); + +#ifdef CONFIG_SMP + smp_send_stop(); +#endif + + notifier_call_chain(&panic_notifier_list, 0, buf); + + if (!panic_blink) + panic_blink = no_blink; + + 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); + for (i = 0; i < panic_timeout*1000; ) { + touch_nmi_watchdog(); + i += panic_blink(i); + mdelay(1); + i++; + } + /* + * 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(KERN_EMERG "Press L1-A to return to the boot prom\n"); + } +#endif +#if defined(CONFIG_ARCH_S390) + disabled_wait(caller); +#endif + local_irq_enable(); + for (i = 0;;) { + i += panic_blink(i); + mdelay(1); + i++; + } +} + +EXPORT_SYMBOL(panic); + +/** + * print_tainted - return a string to represent the kernel taint state. + * + * 'P' - Proprietary module has been loaded. + * 'F' - Module has been forcibly loaded. + * 'S' - SMP with CPUs not designed for SMP. + * 'R' - User forced a module unload. + * 'M' - Machine had a machine check experience. + * 'B' - System has hit bad_page. + * + * The string is overwritten by the next call to print_taint(). + */ + +const char *print_tainted(void) +{ + static char buf[20]; + if (tainted) { + snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c", + tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G', + tainted & TAINT_FORCED_MODULE ? 'F' : ' ', + tainted & TAINT_UNSAFE_SMP ? 'S' : ' ', + tainted & TAINT_FORCED_RMMOD ? 'R' : ' ', + tainted & TAINT_MACHINE_CHECK ? 'M' : ' ', + tainted & TAINT_BAD_PAGE ? 'B' : ' '); + } + else + snprintf(buf, sizeof(buf), "Not tainted"); + return(buf); +} + +void add_taint(unsigned flag) +{ + tainted |= flag; +} +EXPORT_SYMBOL(add_taint); |