Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/kernel/panic.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 3473 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * linux/kernel/panic.c |
3 | * |
4 | * Copyright (C) 1991, 1992 Linus Torvalds |
5 | */ |
6 | |
7 | /* |
8 | * This function is used through-out the kernel (including mm and fs) |
9 | * to indicate a major problem. |
10 | */ |
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/interrupt.h> |
20 | #include <linux/nmi.h> |
21 | |
22 | int panic_timeout; |
23 | int panic_on_oops; |
24 | int tainted; |
25 | |
26 | EXPORT_SYMBOL(panic_timeout); |
27 | |
28 | struct notifier_block *panic_notifier_list; |
29 | |
30 | EXPORT_SYMBOL(panic_notifier_list); |
31 | |
32 | static int __init panic_setup(char *str) |
33 | { |
34 | panic_timeout = simple_strtoul(str, NULL, 0); |
35 | return 1; |
36 | } |
37 | __setup("panic=", panic_setup); |
38 | |
39 | static long no_blink(long time) |
40 | { |
41 | return 0; |
42 | } |
43 | |
44 | /* Returns how long it waited in ms */ |
45 | long (*panic_blink)(long time); |
46 | EXPORT_SYMBOL(panic_blink); |
47 | |
48 | /** |
49 | * panic - halt the system |
50 | * @fmt: The text string to print |
51 | * |
52 | * Display a message, then perform cleanups. |
53 | * |
54 | * This function never returns. |
55 | */ |
56 | |
57 | NORET_TYPE void panic(const char * fmt, ...) |
58 | { |
59 | long i; |
60 | static char buf[1024]; |
61 | va_list args; |
62 | #if defined(CONFIG_ARCH_S390) |
63 | unsigned long caller = (unsigned long) __builtin_return_address(0); |
64 | #endif |
65 | |
66 | bust_spinlocks(1); |
67 | va_start(args, fmt); |
68 | vsnprintf(buf, sizeof(buf), fmt, args); |
69 | va_end(args); |
70 | printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); |
71 | bust_spinlocks(0); |
72 | |
73 | #ifdef CONFIG_SMP |
74 | smp_send_stop(); |
75 | #endif |
76 | |
77 | notifier_call_chain(&panic_notifier_list, 0, buf); |
78 | |
79 | if (!panic_blink) |
80 | panic_blink = no_blink; |
81 | |
82 | if (panic_timeout > 0) |
83 | { |
84 | /* |
85 | * Delay timeout seconds before rebooting the machine. |
86 | * We can't use the "normal" timers since we just panicked.. |
87 | */ |
88 | printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout); |
89 | for (i = 0; i < panic_timeout*1000; ) { |
90 | touch_nmi_watchdog(); |
91 | i += panic_blink(i); |
92 | mdelay(1); |
93 | i++; |
94 | } |
95 | /* |
96 | * Should we run the reboot notifier. For the moment Im |
97 | * choosing not too. It might crash, be corrupt or do |
98 | * more harm than good for other reasons. |
99 | */ |
100 | machine_restart(NULL); |
101 | } |
102 | #ifdef __sparc__ |
103 | { |
104 | extern int stop_a_enabled; |
105 | /* Make sure the user can actually press Stop-A (L1-A) */ |
106 | stop_a_enabled = 1; |
107 | printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n"); |
108 | } |
109 | #endif |
110 | #if defined(CONFIG_ARCH_S390) |
111 | disabled_wait(caller); |
112 | #endif |
113 | local_irq_enable(); |
114 | for (i = 0;;) { |
115 | i += panic_blink(i); |
116 | mdelay(1); |
117 | i++; |
118 | } |
119 | } |
120 | |
121 | EXPORT_SYMBOL(panic); |
122 | |
123 | /** |
124 | * print_tainted - return a string to represent the kernel taint state. |
125 | * |
126 | * 'P' - Proprietary module has been loaded. |
127 | * 'F' - Module has been forcibly loaded. |
128 | * 'S' - SMP with CPUs not designed for SMP. |
129 | * 'R' - User forced a module unload. |
130 | * 'M' - Machine had a machine check experience. |
131 | * 'B' - System has hit bad_page. |
132 | * |
133 | * The string is overwritten by the next call to print_taint(). |
134 | */ |
135 | |
136 | const char *print_tainted(void) |
137 | { |
138 | static char buf[20]; |
139 | if (tainted) { |
140 | snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c", |
141 | tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G', |
142 | tainted & TAINT_FORCED_MODULE ? 'F' : ' ', |
143 | tainted & TAINT_UNSAFE_SMP ? 'S' : ' ', |
144 | tainted & TAINT_FORCED_RMMOD ? 'R' : ' ', |
145 | tainted & TAINT_MACHINE_CHECK ? 'M' : ' ', |
146 | tainted & TAINT_BAD_PAGE ? 'B' : ' '); |
147 | } |
148 | else |
149 | snprintf(buf, sizeof(buf), "Not tainted"); |
150 | return(buf); |
151 | } |
152 | |
153 | void add_taint(unsigned flag) |
154 | { |
155 | tainted |= flag; |
156 | } |
157 | EXPORT_SYMBOL(add_taint); |