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>
20 asmlinkage void sys_sync(void); /* it's really int */
24 struct notifier_block *panic_notifier_list;
26 static int __init panic_setup(char *str)
28 panic_timeout = simple_strtoul(str, NULL, 0);
32 __setup("panic=", panic_setup);
35 * panic - halt the system
36 * @fmt: The text string to print
38 * Display a message, then perform cleanups. Functions in the panic
39 * notifier list are called after the filesystem cache is flushed (when possible).
41 * This function never returns.
44 NORET_TYPE void panic(const char * fmt, ...)
46 static char buf[1024];
48 #if defined(CONFIG_ARCH_S390)
49 unsigned long caller = (unsigned long) __builtin_return_address(0);
54 vsprintf(buf, fmt, args);
56 printk(KERN_EMERG "Kernel panic: %s\n",buf);
58 printk(KERN_EMERG "In interrupt handler - not syncing\n");
59 else if (!current->pid)
60 printk(KERN_EMERG "In idle task - not syncing\n");
69 notifier_call_chain(&panic_notifier_list, 0, NULL);
71 if (panic_timeout > 0)
74 * Delay timeout seconds before rebooting the machine.
75 * We can't use the "normal" timers since we just panicked..
77 printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
78 mdelay(panic_timeout*1000);
80 * Should we run the reboot notifier. For the moment Im
81 * choosing not too. It might crash, be corrupt or do
82 * more harm than good for other reasons.
84 machine_restart(NULL);
88 extern int stop_a_enabled;
89 /* Make sure the user can actually press L1-A */
91 printk("Press L1-A to return to the boot prom\n");
94 #if defined(CONFIG_ARCH_S390)
95 disabled_wait(caller);
99 #if defined(CONFIG_X86) && defined(CONFIG_VT)
100 extern void panic_blink(void);
108 * print_tainted - return a string to represent the kernel taint state.
110 * The string is overwritten by the next call to print_taint().
113 const char *print_tainted()
117 snprintf(buf, sizeof(buf), "Tainted: %c%c",
118 tainted & 1 ? 'P' : 'G',
119 tainted & 2 ? 'F' : ' ');
122 snprintf(buf, sizeof(buf), "Not tainted");
129 * A BUG() call in an inline function in a header should be avoided,
130 * because it can seriously bloat the kernel. So here we have
132 * We lose the BUG()-time file-and-line info this way, but it's
133 * usually not very useful from an inline anyway. The backtrace
134 * tells us what we want to know.
137 void __out_of_line_bug(int line)
139 printk("kernel BUG in header file at line %d\n", line);
143 /* Satisfy __attribute__((noreturn)) */