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>
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);
46 EXPORT_SYMBOL_GPL(netdump_mode);
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, ...)
60 static char buf[1024];
62 #if defined(CONFIG_ARCH_S390)
63 unsigned long caller = (unsigned long) __builtin_return_address(0);
68 vsnprintf(buf, sizeof(buf), fmt, args);
71 printk(KERN_EMERG "Kernel panic: %s\n",buf);
75 printk(KERN_EMERG "In interrupt handler - not syncing\n");
76 else if (!current->pid)
77 printk(KERN_EMERG "In idle task - not syncing\n");
82 notifier_call_chain(&panic_notifier_list, 0, buf);
88 if (panic_timeout > 0) {
91 * Delay timeout seconds before rebooting the machine.
92 * We can't use the "normal" timers since we just panicked..
94 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
98 image = xchg(&kexec_image, 0);
100 printk(KERN_EMERG "by starting a new kernel ..\n");
101 mdelay(panic_timeout*1000);
102 machine_kexec(image);
106 for (i = 0; i < panic_timeout; i++) {
107 touch_nmi_watchdog();
111 * Should we run the reboot notifier. For the moment Im
112 * choosing not too. It might crash, be corrupt or do
113 * more harm than good for other reasons.
115 machine_restart(NULL);
119 extern int stop_a_enabled;
120 /* Make sure the user can actually press L1-A */
122 printk(KERN_EMERG "Press L1-A to return to the boot prom\n");
125 #if defined(CONFIG_ARCH_S390)
126 disabled_wait(caller);
133 EXPORT_SYMBOL(panic);
136 * print_tainted - return a string to represent the kernel taint state.
138 * 'P' - Proprietary module has been loaded.
139 * 'F' - Module has been forcibly loaded.
140 * 'S' - SMP with CPUs not designed for SMP.
142 * The string is overwritten by the next call to print_taint().
145 const char *print_tainted(void)
149 snprintf(buf, sizeof(buf), "Tainted: %c%c%c",
150 tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
151 tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
152 tainted & TAINT_UNSAFE_SMP ? 'S' : ' ');
155 snprintf(buf, sizeof(buf), "Not tainted");