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 */
26 struct notifier_block
*panic_notifier_list
;
28 static int __init
panic_setup(char *str
)
30 panic_timeout
= simple_strtoul(str
, NULL
, 0);
33 __setup("panic=", panic_setup
);
36 * panic - halt the system
37 * @fmt: The text string to print
39 * Display a message, then perform cleanups. Functions in the panic
40 * notifier list are called after the filesystem cache is flushed (when possible).
42 * This function never returns.
45 NORET_TYPE
void panic(const char * fmt
, ...)
47 static char buf
[1024];
49 #if defined(CONFIG_ARCH_S390)
50 unsigned long caller
= (unsigned long) __builtin_return_address(0);
55 vsnprintf(buf
, sizeof(buf
), fmt
, args
);
57 printk(KERN_EMERG
"Kernel panic: %s\n",buf
);
59 printk(KERN_EMERG
"In interrupt handler - not syncing\n");
60 else if (!current
->pid
)
61 printk(KERN_EMERG
"In idle task - not syncing\n");
70 notifier_call_chain(&panic_notifier_list
, 0, buf
);
72 if (panic_timeout
> 0)
75 * Delay timeout seconds before rebooting the machine.
76 * We can't use the "normal" timers since we just panicked..
78 printk(KERN_EMERG
"Rebooting in %d seconds..",panic_timeout
);
79 mdelay(panic_timeout
*1000);
81 * Should we run the reboot notifier. For the moment Im
82 * choosing not too. It might crash, be corrupt or do
83 * more harm than good for other reasons.
85 machine_restart(NULL
);
89 extern int stop_a_enabled
;
90 /* Make sure the user can actually press L1-A */
92 printk(KERN_EMERG
"Press L1-A to return to the boot prom\n");
95 #if defined(CONFIG_ARCH_S390)
96 disabled_wait(caller
);
104 * print_tainted - return a string to represent the kernel taint state.
106 * 'P' - Proprietary module has been loaded.
107 * 'F' - Module has been forcibly loaded.
108 * 'S' - SMP with CPUs not designed for SMP.
110 * The string is overwritten by the next call to print_taint().
113 const char *print_tainted(void)
117 snprintf(buf
, sizeof(buf
), "Tainted: %c%c%c",
118 tainted
& TAINT_PROPRIETARY_MODULE
? 'P' : 'G',
119 tainted
& TAINT_FORCED_MODULE
? 'F' : ' ',
120 tainted
& TAINT_UNSAFE_SMP
? 'S' : ' ');
123 snprintf(buf
, sizeof(buf
), "Not tainted");