blob: 1daccb2ffa03994e3c91fd765764a0c21032b051 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Andrew Morton657b3012006-08-13 23:24:19 -070011#include <linux/debug_locks.h>
Ingo Molnarc95dbf22009-03-13 11:14:06 +010012#include <linux/interrupt.h>
Simon Kagstrom456b5652009-10-16 14:09:18 +020013#include <linux/kmsg_dump.h>
Arjan van de Ven79b4cc52008-01-30 13:32:50 +010014#include <linux/kallsyms.h>
Ingo Molnarc95dbf22009-03-13 11:14:06 +010015#include <linux/notifier.h>
16#include <linux/module.h>
17#include <linux/random.h>
18#include <linux/reboot.h>
19#include <linux/delay.h>
20#include <linux/kexec.h>
21#include <linux/sched.h>
22#include <linux/sysrq.h>
23#include <linux/init.h>
24#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070026#define PANIC_TIMER_STEP 100
27#define PANIC_BLINK_SPD 18
28
Kyle McMartin2a01bb32012-04-11 08:15:29 -040029int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
Andi Kleen25ddbb12008-10-15 22:01:41 -070030static unsigned long tainted_mask;
Andrew Mortondd287792006-03-23 03:00:57 -080031static int pause_on_oops;
32static int pause_on_oops_flag;
33static DEFINE_SPINLOCK(pause_on_oops_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Arve Hjønnevåg4f948f62007-05-08 15:39:13 +070035#ifndef CONFIG_PANIC_TIMEOUT
36#define CONFIG_PANIC_TIMEOUT 0
37#endif
38int panic_timeout = CONFIG_PANIC_TIMEOUT;
Huang Ying81e88fd2011-01-12 14:44:55 +080039EXPORT_SYMBOL_GPL(panic_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Alan Sterne041c682006-03-27 01:16:30 -080041ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43EXPORT_SYMBOL(panic_notifier_list);
44
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070045static long no_blink(int state)
Anton Blanchard8aeee852010-03-05 13:42:55 -080046{
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070047 return 0;
Anton Blanchard8aeee852010-03-05 13:42:55 -080048}
49
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070050/* Returns how long it waited in ms */
51long (*panic_blink)(int state);
52EXPORT_SYMBOL(panic_blink);
53
Michael Holzheu93e13a32012-01-12 17:20:18 -080054/*
55 * Stop ourself in panic -- architecture code may override this
56 */
57void __weak panic_smp_self_stop(void)
58{
59 while (1)
60 cpu_relax();
61}
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063/**
64 * panic - halt the system
65 * @fmt: The text string to print
66 *
67 * Display a message, then perform cleanups.
68 *
69 * This function never returns.
70 */
Joe Perches9402c952012-01-12 17:17:17 -080071void panic(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
Michael Holzheu93e13a32012-01-12 17:20:18 -080073 static DEFINE_SPINLOCK(panic_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 static char buf[1024];
75 va_list args;
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070076 long i, i_next = 0;
77 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Eric W. Biedermandc009d92005-06-25 14:57:52 -070079 /*
Vikram Mulukutla190320c2012-07-30 14:39:58 -070080 * Disable local interrupts. This will prevent panic_smp_self_stop
81 * from deadlocking the first cpu that invokes the panic, since
82 * there is nothing to prevent an interrupt handler (that runs
83 * after the panic_lock is acquired) from invoking panic again.
84 */
85 local_irq_disable();
86
87 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +010088 * It's possible to come here directly from a panic-assertion and
89 * not have preempt disabled. Some functions called from here want
Eric W. Biedermandc009d92005-06-25 14:57:52 -070090 * preempt to be disabled. No point enabling it later though...
Michael Holzheu93e13a32012-01-12 17:20:18 -080091 *
92 * Only one CPU is allowed to execute the panic code from here. For
93 * multiple parallel invocations of panic, all other CPUs either
94 * stop themself or will wait until they are stopped by the 1st CPU
95 * with smp_send_stop().
Eric W. Biedermandc009d92005-06-25 14:57:52 -070096 */
Michael Holzheu93e13a32012-01-12 17:20:18 -080097 if (!spin_trylock(&panic_lock))
98 panic_smp_self_stop();
Eric W. Biedermandc009d92005-06-25 14:57:52 -070099
Anton Blanchard5b530fc2010-05-26 14:44:24 -0700100 console_verbose();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 bust_spinlocks(1);
102 va_start(args, fmt);
103 vsnprintf(buf, sizeof(buf), fmt, args);
104 va_end(args);
105 printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
Ingo Molnar5cb27302008-02-14 09:07:01 +0100106#ifdef CONFIG_DEBUG_BUGVERBOSE
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800107 /*
108 * Avoid nested stack-dumping if a panic occurs during oops processing
109 */
Jason Wessel026ee1f2012-04-12 12:49:17 -0700110 if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800111 dump_stack();
Ingo Molnar5cb27302008-02-14 09:07:01 +0100112#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700114 /*
115 * If we have crashed and we have a crash kernel loaded let it handle
116 * everything else.
117 * Do we want to call this before we try to display a message?
118 */
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700119 crash_kexec(NULL);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700120
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700121 /*
122 * Note smp_send_stop is the usual smp shutdown function, which
123 * unfortunately means it may not be hardened to work in a panic
124 * situation.
125 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 smp_send_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Seiji Aguchi62be73e2012-05-15 17:35:09 -0400128 kmsg_dump(KMSG_DUMP_PANIC);
129
Alan Sterne041c682006-03-27 01:16:30 -0800130 atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Aaro Koskinend014e882009-10-02 14:41:20 +0300132 bust_spinlocks(0);
133
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700134 if (!panic_blink)
135 panic_blink = no_blink;
136
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700137 if (panic_timeout > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100139 * Delay timeout seconds before rebooting the machine.
140 * We can't use the "normal" timers since we just panicked.
141 */
142 printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
143
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700144 for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 touch_nmi_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700146 if (i >= i_next) {
147 i += panic_blink(state ^= 1);
148 i_next = i + 3600 / PANIC_BLINK_SPD;
149 }
150 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
Hugh Dickins4302fbc2011-07-26 16:08:52 -0700152 }
153 if (panic_timeout != 0) {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100154 /*
155 * This will not be a clean reboot, with everything
156 * shutting down. But if there is a chance of
157 * rebooting the system it will be rebooted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 */
Eric W. Biederman2f048ea2005-07-26 11:49:23 -0600159 emergency_restart();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161#ifdef __sparc__
162 {
163 extern int stop_a_enabled;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700164 /* Make sure the user can actually press Stop-A (L1-A) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 stop_a_enabled = 1;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700166 printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
168#endif
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800169#if defined(CONFIG_S390)
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100170 {
171 unsigned long caller;
172
173 caller = (unsigned long)__builtin_return_address(0);
174 disabled_wait(caller);
175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176#endif
177 local_irq_enable();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700178 for (i = 0; ; i += PANIC_TIMER_STEP) {
Jan Beulichc22db942006-02-10 01:51:11 -0800179 touch_softlockup_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700180 if (i >= i_next) {
181 i += panic_blink(state ^= 1);
182 i_next = i + 3600 / PANIC_BLINK_SPD;
183 }
184 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186}
187
188EXPORT_SYMBOL(panic);
189
Daniel Walkerc277e632007-10-18 03:06:08 -0700190
Andi Kleen25ddbb12008-10-15 22:01:41 -0700191struct tnt {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100192 u8 bit;
193 char true;
194 char false;
Andi Kleen25ddbb12008-10-15 22:01:41 -0700195};
196
197static const struct tnt tnts[] = {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100198 { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
199 { TAINT_FORCED_MODULE, 'F', ' ' },
200 { TAINT_UNSAFE_SMP, 'S', ' ' },
201 { TAINT_FORCED_RMMOD, 'R', ' ' },
202 { TAINT_MACHINE_CHECK, 'M', ' ' },
203 { TAINT_BAD_PAGE, 'B', ' ' },
204 { TAINT_USER, 'U', ' ' },
205 { TAINT_DIE, 'D', ' ' },
206 { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
207 { TAINT_WARN, 'W', ' ' },
208 { TAINT_CRAP, 'C', ' ' },
Ben Hutchings92946bc2010-04-03 19:36:42 +0100209 { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200210 { TAINT_OOT_MODULE, 'O', ' ' },
Andi Kleen25ddbb12008-10-15 22:01:41 -0700211};
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213/**
214 * print_tainted - return a string to represent the kernel taint state.
215 *
216 * 'P' - Proprietary module has been loaded.
217 * 'F' - Module has been forcibly loaded.
218 * 'S' - SMP with CPUs not designed for SMP.
219 * 'R' - User forced a module unload.
220 * 'M' - System experienced a machine check exception.
221 * 'B' - System has hit bad_page.
222 * 'U' - Userspace-defined naughtiness.
Arjan van de Vena8005992008-12-01 13:14:00 -0800223 * 'D' - Kernel has oopsed before
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 * 'A' - ACPI table overridden.
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800225 * 'W' - Taint on warning.
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -0700226 * 'C' - modules from drivers/staging are loaded.
Ben Hutchings92946bc2010-04-03 19:36:42 +0100227 * 'I' - Working around severe firmware bug.
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200228 * 'O' - Out-of-tree module has been loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 *
Robert P. J. Dayfe002a42009-06-28 21:10:07 -0400230 * The string is overwritten by the next call to print_tainted().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232const char *print_tainted(void)
233{
Andi Kleen25ddbb12008-10-15 22:01:41 -0700234 static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
235
236 if (tainted_mask) {
237 char *s;
238 int i;
239
240 s = buf + sprintf(buf, "Tainted: ");
241 for (i = 0; i < ARRAY_SIZE(tnts); i++) {
242 const struct tnt *t = &tnts[i];
243 *s++ = test_bit(t->bit, &tainted_mask) ?
244 t->true : t->false;
245 }
246 *s = 0;
247 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 snprintf(buf, sizeof(buf), "Not tainted");
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100249
250 return buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
Andi Kleen25ddbb12008-10-15 22:01:41 -0700253int test_taint(unsigned flag)
254{
255 return test_bit(flag, &tainted_mask);
256}
257EXPORT_SYMBOL(test_taint);
258
259unsigned long get_taint(void)
260{
261 return tainted_mask;
262}
263
Rusty Russell373d4d02013-01-21 17:17:39 +1030264/**
265 * add_taint: add a taint flag if not already set.
266 * @flag: one of the TAINT_* constants.
267 * @lockdep_ok: whether lock debugging is still OK.
268 *
269 * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
270 * some notewortht-but-not-corrupting cases, it can be set to true.
271 */
272void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
Rusty Russell373d4d02013-01-21 17:17:39 +1030274 if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
275 printk(KERN_WARNING
276 "Disabling lock debugging due to kernel taint\n");
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200277
Andi Kleen25ddbb12008-10-15 22:01:41 -0700278 set_bit(flag, &tainted_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279}
280EXPORT_SYMBOL(add_taint);
Andrew Mortondd287792006-03-23 03:00:57 -0800281
Andrew Mortondd287792006-03-23 03:00:57 -0800282static void spin_msec(int msecs)
283{
284 int i;
285
286 for (i = 0; i < msecs; i++) {
287 touch_nmi_watchdog();
288 mdelay(1);
289 }
290}
291
292/*
293 * It just happens that oops_enter() and oops_exit() are identically
294 * implemented...
295 */
296static void do_oops_enter_exit(void)
297{
298 unsigned long flags;
299 static int spin_counter;
300
301 if (!pause_on_oops)
302 return;
303
304 spin_lock_irqsave(&pause_on_oops_lock, flags);
305 if (pause_on_oops_flag == 0) {
306 /* This CPU may now print the oops message */
307 pause_on_oops_flag = 1;
308 } else {
309 /* We need to stall this CPU */
310 if (!spin_counter) {
311 /* This CPU gets to do the counting */
312 spin_counter = pause_on_oops;
313 do {
314 spin_unlock(&pause_on_oops_lock);
315 spin_msec(MSEC_PER_SEC);
316 spin_lock(&pause_on_oops_lock);
317 } while (--spin_counter);
318 pause_on_oops_flag = 0;
319 } else {
320 /* This CPU waits for a different one */
321 while (spin_counter) {
322 spin_unlock(&pause_on_oops_lock);
323 spin_msec(1);
324 spin_lock(&pause_on_oops_lock);
325 }
326 }
327 }
328 spin_unlock_irqrestore(&pause_on_oops_lock, flags);
329}
330
331/*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100332 * Return true if the calling CPU is allowed to print oops-related info.
333 * This is a bit racy..
Andrew Mortondd287792006-03-23 03:00:57 -0800334 */
335int oops_may_print(void)
336{
337 return pause_on_oops_flag == 0;
338}
339
340/*
341 * Called when the architecture enters its oops handler, before it prints
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100342 * anything. If this is the first CPU to oops, and it's oopsing the first
343 * time then let it proceed.
Andrew Mortondd287792006-03-23 03:00:57 -0800344 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100345 * This is all enabled by the pause_on_oops kernel boot option. We do all
346 * this to ensure that oopses don't scroll off the screen. It has the
347 * side-effect of preventing later-oopsing CPUs from mucking up the display,
348 * too.
Andrew Mortondd287792006-03-23 03:00:57 -0800349 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100350 * It turns out that the CPU which is allowed to print ends up pausing for
351 * the right duration, whereas all the other CPUs pause for twice as long:
352 * once in oops_enter(), once in oops_exit().
Andrew Mortondd287792006-03-23 03:00:57 -0800353 */
354void oops_enter(void)
355{
Thomas Gleixnerbdff7872009-07-24 15:30:45 -0400356 tracing_off();
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100357 /* can't trust the integrity of the kernel anymore: */
358 debug_locks_off();
Andrew Mortondd287792006-03-23 03:00:57 -0800359 do_oops_enter_exit();
360}
361
362/*
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100363 * 64-bit random ID for oopses:
364 */
365static u64 oops_id;
366
367static int init_oops_id(void)
368{
369 if (!oops_id)
370 get_random_bytes(&oops_id, sizeof(oops_id));
Arjan van de Vend6624f92009-01-06 14:40:54 -0800371 else
372 oops_id++;
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100373
374 return 0;
375}
376late_initcall(init_oops_id);
377
Anton Blanchard863a6042010-08-10 18:03:30 -0700378void print_oops_end_marker(void)
Arjan van de Ven71c33912008-01-30 13:32:50 +0100379{
380 init_oops_id();
381 printk(KERN_WARNING "---[ end trace %016llx ]---\n",
382 (unsigned long long)oops_id);
383}
384
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100385/*
Andrew Mortondd287792006-03-23 03:00:57 -0800386 * Called when the architecture exits its oops handler, after printing
387 * everything.
388 */
389void oops_exit(void)
390{
391 do_oops_enter_exit();
Arjan van de Ven71c33912008-01-30 13:32:50 +0100392 print_oops_end_marker();
Simon Kagstrom456b5652009-10-16 14:09:18 +0200393 kmsg_dump(KMSG_DUMP_OOPS);
Andrew Mortondd287792006-03-23 03:00:57 -0800394}
Arjan van de Ven3162f752006-09-26 10:52:39 +0200395
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100396#ifdef WANT_WARN_ON_SLOWPATH
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700397struct slowpath_args {
398 const char *fmt;
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700399 va_list args;
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700400};
401
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100402static void warn_slowpath_common(const char *file, int line, void *caller,
403 unsigned taint, struct slowpath_args *args)
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700404{
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700405 printk(KERN_WARNING "------------[ cut here ]------------\n");
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700406 printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
Arjan van de Ven74853db2008-11-28 08:35:25 -0800407
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700408 if (args)
409 vprintk(args->fmt, args->args);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700410
411 print_modules();
412 dump_stack();
413 print_oops_end_marker();
Rusty Russell373d4d02013-01-21 17:17:39 +1030414 /* Just a warning, don't kill lockdep. */
415 add_taint(taint, LOCKDEP_STILL_OK);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700416}
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700417
418void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
419{
420 struct slowpath_args args;
421
422 args.fmt = fmt;
423 va_start(args.args, fmt);
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100424 warn_slowpath_common(file, line, __builtin_return_address(0),
425 TAINT_WARN, &args);
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700426 va_end(args.args);
427}
Andi Kleen57adc4d2009-05-06 16:02:53 -0700428EXPORT_SYMBOL(warn_slowpath_fmt);
429
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100430void warn_slowpath_fmt_taint(const char *file, int line,
431 unsigned taint, const char *fmt, ...)
432{
433 struct slowpath_args args;
434
435 args.fmt = fmt;
436 va_start(args.args, fmt);
437 warn_slowpath_common(file, line, __builtin_return_address(0),
438 taint, &args);
439 va_end(args.args);
440}
441EXPORT_SYMBOL(warn_slowpath_fmt_taint);
442
Andi Kleen57adc4d2009-05-06 16:02:53 -0700443void warn_slowpath_null(const char *file, int line)
444{
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100445 warn_slowpath_common(file, line, __builtin_return_address(0),
446 TAINT_WARN, NULL);
Andi Kleen57adc4d2009-05-06 16:02:53 -0700447}
448EXPORT_SYMBOL(warn_slowpath_null);
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100449#endif
450
Arjan van de Ven3162f752006-09-26 10:52:39 +0200451#ifdef CONFIG_CC_STACKPROTECTOR
Arjan van de Ven54371a42008-02-15 15:33:12 -0800452
Arjan van de Ven3162f752006-09-26 10:52:39 +0200453/*
454 * Called when gcc's -fstack-protector feature is used, and
455 * gcc detects corruption of the on-stack canary value
456 */
457void __stack_chk_fail(void)
458{
Ingo Molnar517a92c2008-02-14 09:02:13 +0100459 panic("stack-protector: Kernel stack is corrupted in: %p\n",
460 __builtin_return_address(0));
Arjan van de Ven3162f752006-09-26 10:52:39 +0200461}
462EXPORT_SYMBOL(__stack_chk_fail);
Arjan van de Ven54371a42008-02-15 15:33:12 -0800463
Arjan van de Ven3162f752006-09-26 10:52:39 +0200464#endif
Rusty Russellf44dd162008-10-22 10:00:24 -0500465
466core_param(panic, panic_timeout, int, 0644);
467core_param(pause_on_oops, pause_on_oops, int, 0644);
Olaf Heringd404ab02011-03-22 16:34:04 -0700468
469static int __init oops_setup(char *s)
470{
471 if (!s)
472 return -EINVAL;
473 if (!strcmp(s, "panic"))
474 panic_on_oops = 1;
475 return 0;
476}
477early_param("oops", oops_setup);