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/sched.h>
13 #include <linux/delay.h>
14 #include <linux/reboot.h>
15 #include <linux/notifier.h>
16 #include <linux/init.h>
17 #include <linux/sysrq.h>
18 #include <linux/interrupt.h>
19 #include <linux/console.h>
21 asmlinkage void sys_sync(void); /* it's really int */
25 struct notifier_block *panic_notifier_list;
27 static int __init panic_setup(char *str)
29 panic_timeout = simple_strtoul(str, NULL, 0);
33 __setup("panic=", panic_setup);
38 * panic - halt the system
39 * @fmt: The text string to print
41 * Display a message, then perform cleanups. Functions in the panic
42 * notifier list are called after the filesystem cache is flushed (when possible).
44 * This function never returns.
47 NORET_TYPE void panic(const char * fmt, ...)
49 static char buf[1024];
51 #if defined(CONFIG_ARCH_S390)
52 unsigned long caller = (unsigned long) __builtin_return_address(0);
56 disable_console_blank();
62 vsnprintf(buf, sizeof(buf), fmt, args);
64 printk(KERN_EMERG "Kernel panic: %s\n",buf);
66 printk(KERN_EMERG "In interrupt handler - not syncing\n");
67 else if (!current->pid)
68 printk(KERN_EMERG "In idle task - not syncing\n");
77 notifier_call_chain(&panic_notifier_list, 0, NULL);
79 if (panic_timeout > 0)
82 * Delay timeout seconds before rebooting the machine.
83 * We can't use the "normal" timers since we just panicked..
85 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
86 mdelay(panic_timeout*1000);
88 * Should we run the reboot notifier. For the moment Im
89 * choosing not too. It might crash, be corrupt or do
90 * more harm than good for other reasons.
92 machine_restart(NULL);
96 extern int stop_a_enabled;
97 /* Make sure the user can actually press L1-A */
99 printk("Press L1-A to return to the boot prom\n");
102 #if defined(CONFIG_ARCH_S390)
103 disabled_wait(caller);
107 #if defined(CONFIG_X86) && defined(CONFIG_VT) && !defined(CONFIG_DUMMY_KEYB)
108 extern void panic_blink(void);
116 * print_tainted - return a string to represent the kernel taint state.
118 * The string is overwritten by the next call to print_taint().
121 const char *print_tainted()
125 snprintf(buf, sizeof(buf), "Tainted: %c%c",
126 tainted & 1 ? 'P' : 'G',
127 tainted & 2 ? 'F' : ' ');
130 snprintf(buf, sizeof(buf), "Not tainted");
137 * A BUG() call in an inline function in a header should be avoided,
138 * because it can seriously bloat the kernel. So here we have
140 * We lose the BUG()-time file-and-line info this way, but it's
141 * usually not very useful from an inline anyway. The backtrace
142 * tells us what we want to know.
145 void __out_of_line_bug(int line)
147 printk("kernel BUG in header file at line %d\n", line);
151 /* Satisfy __attribute__((noreturn)) */