4 * Copyright (C) 1991, 1992 Linus Torvalds
8 * This function is used through-out the kernel (including mm and fs)
9 * to indicate a major problem.
11 #include <linux/config.h>
12 #include <linux/module.h>
13 #include <linux/sched.h>
14 #include <linux/delay.h>
15 #include <linux/reboot.h>
16 #include <linux/notifier.h>
17 #include <linux/init.h>
18 #include <linux/sysrq.h>
19 #include <linux/interrupt.h>
20 #include <linux/nmi.h>
26 EXPORT_SYMBOL(panic_timeout);
28 struct notifier_block *panic_notifier_list;
30 EXPORT_SYMBOL(panic_notifier_list);
32 static int __init panic_setup(char *str)
34 panic_timeout = simple_strtoul(str, NULL, 0);
37 __setup("panic=", panic_setup);
39 static long no_blink(long time)
44 /* Returns how long it waited in ms */
45 long (*panic_blink)(long time);
46 EXPORT_SYMBOL(panic_blink);
49 * panic - halt the system
50 * @fmt: The text string to print
52 * Display a message, then perform cleanups. Functions in the panic
53 * notifier list are called after the filesystem cache is flushed (when possible).
55 * This function never returns.
58 NORET_TYPE void panic(const char * fmt, ...)
61 static char buf[1024];
63 #if defined(CONFIG_ARCH_S390)
64 unsigned long caller = (unsigned long) __builtin_return_address(0);
69 vsnprintf(buf, sizeof(buf), fmt, args);
71 printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
78 notifier_call_chain(&panic_notifier_list, 0, buf);
81 panic_blink = no_blink;
83 if (panic_timeout > 0)
86 * Delay timeout seconds before rebooting the machine.
87 * We can't use the "normal" timers since we just panicked..
89 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
90 for (i = 0; i < panic_timeout*1000; ) {
97 * Should we run the reboot notifier. For the moment Im
98 * choosing not too. It might crash, be corrupt or do
99 * more harm than good for other reasons.
101 machine_restart(NULL);
105 extern int stop_a_enabled;
106 /* Make sure the user can actually press L1-A */
108 printk(KERN_EMERG "Press L1-A to return to the boot prom\n");
111 #if defined(CONFIG_ARCH_S390)
112 disabled_wait(caller);
122 EXPORT_SYMBOL(panic);
125 * print_tainted - return a string to represent the kernel taint state.
127 * 'P' - Proprietary module has been loaded.
128 * 'F' - Module has been forcibly loaded.
129 * 'S' - SMP with CPUs not designed for SMP.
130 * 'R' - User forced a module unload.
131 * 'M' - Machine had a machine check experience.
132 * 'B' - System has hit bad_page.
134 * The string is overwritten by the next call to print_taint().
137 const char *print_tainted(void)
141 snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
142 tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
143 tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
144 tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
145 tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
146 tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
147 tainted & TAINT_BAD_PAGE ? 'B' : ' ');
150 snprintf(buf, sizeof(buf), "Not tainted");
154 void add_taint(unsigned flag)
158 EXPORT_SYMBOL(add_taint);