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/syscalls.h>
20 #include <linux/interrupt.h>
21 #include <linux/nmi.h>
23 #include <linux/kexec.h>
26 int panic_timeout = 900;
27 int panic_on_oops = 1;
29 void (*dump_function_ptr)(const char *, const struct pt_regs *) = 0;
31 EXPORT_SYMBOL(panic_timeout);
32 EXPORT_SYMBOL(dump_function_ptr);
34 struct notifier_block *panic_notifier_list;
36 EXPORT_SYMBOL(panic_notifier_list);
38 static int __init panic_setup(char *str)
40 panic_timeout = simple_strtoul(str, NULL, 0);
43 __setup("panic=", panic_setup);
45 static long no_blink(long time)
50 /* Returns how long it waited in ms */
51 long (*panic_blink)(long time) = no_blink;
52 EXPORT_SYMBOL(panic_blink);
55 * panic - halt the system
56 * @fmt: The text string to print
58 * Display a message, then perform cleanups. Functions in the panic
59 * notifier list are called after the filesystem cache is flushed (when possible).
61 * This function never returns.
64 NORET_TYPE void panic(const char * fmt, ...)
67 static char buf[1024];
69 #if defined(CONFIG_ARCH_S390)
70 unsigned long caller = (unsigned long) __builtin_return_address(0);
75 vsnprintf(buf, sizeof(buf), fmt, args);
78 printk(KERN_EMERG "Kernel panic: %s\n",buf);
79 #warning MEF netdump_func not part of 2.6.9-1.11-FC2; taking out call for now
85 printk(KERN_EMERG "In interrupt handler - not syncing\n");
86 else if (!current->pid)
87 printk(KERN_EMERG "In idle task - not syncing\n");
92 notifier_call_chain(&panic_notifier_list, 0, buf);
98 notifier_call_chain(&panic_notifier_list, 0, buf);
100 if (panic_timeout > 0)
103 * Delay timeout seconds before rebooting the machine.
104 * We can't use the "normal" timers since we just panicked..
106 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
109 struct kimage *image;
110 image = xchg(&kexec_image, 0);
112 printk(KERN_EMERG "by starting a new kernel ..\n");
113 mdelay(panic_timeout*1000);
114 machine_kexec(image);
118 for (i = 0; i < panic_timeout*1000; ) {
119 touch_nmi_watchdog();
125 * Should we run the reboot notifier. For the moment Im
126 * choosing not too. It might crash, be corrupt or do
127 * more harm than good for other reasons.
129 machine_restart(NULL);
133 extern int stop_a_enabled;
134 /* Make sure the user can actually press L1-A */
136 printk(KERN_EMERG "Press L1-A to return to the boot prom\n");
139 #if defined(CONFIG_ARCH_S390)
140 disabled_wait(caller);
150 EXPORT_SYMBOL(panic);
153 * print_tainted - return a string to represent the kernel taint state.
155 * 'P' - Proprietary module has been loaded.
156 * 'F' - Module has been forcibly loaded.
157 * 'S' - SMP with CPUs not designed for SMP.
158 * 'R' - User forced a module unload.
159 * 'M' - Machine had a machine check experience.
160 * 'B' - System has hit bad_page.
162 * The string is overwritten by the next call to print_taint().
165 const char *print_tainted(void)
169 snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
170 tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
171 tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
172 tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
173 tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
174 tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
175 tainted & TAINT_BAD_PAGE ? 'B' : ' ');
178 snprintf(buf, sizeof(buf), "Not tainted");
182 void add_taint(unsigned flag)
186 EXPORT_SYMBOL(add_taint);