blob: e1b2822fff97b8164ffae96e8a17ace02060a0c1 [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>
Arjan van de Venbd89bb22008-11-28 08:36:09 -080025#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070027#define PANIC_TIMER_STEP 100
28#define PANIC_BLINK_SPD 18
29
Kyle McMartin2a01bb32012-04-11 08:15:29 -040030int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
Andi Kleen25ddbb12008-10-15 22:01:41 -070031static unsigned long tainted_mask;
Andrew Mortondd287792006-03-23 03:00:57 -080032static int pause_on_oops;
33static int pause_on_oops_flag;
34static DEFINE_SPINLOCK(pause_on_oops_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Andrew Mortondd287792006-03-23 03:00:57 -080036int panic_timeout;
Huang Ying81e88fd2011-01-12 14:44:55 +080037EXPORT_SYMBOL_GPL(panic_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Alan Sterne041c682006-03-27 01:16:30 -080039ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41EXPORT_SYMBOL(panic_notifier_list);
42
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070043static long no_blink(int state)
Anton Blanchard8aeee852010-03-05 13:42:55 -080044{
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070045 return 0;
Anton Blanchard8aeee852010-03-05 13:42:55 -080046}
47
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070048/* Returns how long it waited in ms */
49long (*panic_blink)(int state);
50EXPORT_SYMBOL(panic_blink);
51
Michael Holzheu93e13a32012-01-12 17:20:18 -080052/*
53 * Stop ourself in panic -- architecture code may override this
54 */
55void __weak panic_smp_self_stop(void)
56{
57 while (1)
58 cpu_relax();
59}
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/**
62 * panic - halt the system
63 * @fmt: The text string to print
64 *
65 * Display a message, then perform cleanups.
66 *
67 * This function never returns.
68 */
Joe Perches9402c952012-01-12 17:17:17 -080069void panic(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Michael Holzheu93e13a32012-01-12 17:20:18 -080071 static DEFINE_SPINLOCK(panic_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 static char buf[1024];
73 va_list args;
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070074 long i, i_next = 0;
75 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Eric W. Biedermandc009d92005-06-25 14:57:52 -070077 /*
Vikram Mulukutla190320c2012-07-30 14:39:58 -070078 * Disable local interrupts. This will prevent panic_smp_self_stop
79 * from deadlocking the first cpu that invokes the panic, since
80 * there is nothing to prevent an interrupt handler (that runs
81 * after the panic_lock is acquired) from invoking panic again.
82 */
83 local_irq_disable();
84
85 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +010086 * It's possible to come here directly from a panic-assertion and
87 * not have preempt disabled. Some functions called from here want
Eric W. Biedermandc009d92005-06-25 14:57:52 -070088 * preempt to be disabled. No point enabling it later though...
Michael Holzheu93e13a32012-01-12 17:20:18 -080089 *
90 * Only one CPU is allowed to execute the panic code from here. For
91 * multiple parallel invocations of panic, all other CPUs either
92 * stop themself or will wait until they are stopped by the 1st CPU
93 * with smp_send_stop().
Eric W. Biedermandc009d92005-06-25 14:57:52 -070094 */
Michael Holzheu93e13a32012-01-12 17:20:18 -080095 if (!spin_trylock(&panic_lock))
96 panic_smp_self_stop();
Eric W. Biedermandc009d92005-06-25 14:57:52 -070097
Anton Blanchard5b530fc2010-05-26 14:44:24 -070098 console_verbose();
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 bust_spinlocks(1);
100 va_start(args, fmt);
101 vsnprintf(buf, sizeof(buf), fmt, args);
102 va_end(args);
103 printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
Ingo Molnar5cb27302008-02-14 09:07:01 +0100104#ifdef CONFIG_DEBUG_BUGVERBOSE
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800105 /*
106 * Avoid nested stack-dumping if a panic occurs during oops processing
107 */
Jason Wessel026ee1f2012-04-12 12:49:17 -0700108 if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800109 dump_stack();
Ingo Molnar5cb27302008-02-14 09:07:01 +0100110#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700112 /*
113 * If we have crashed and we have a crash kernel loaded let it handle
114 * everything else.
115 * Do we want to call this before we try to display a message?
116 */
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700117 crash_kexec(NULL);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700118
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700119 /*
120 * Note smp_send_stop is the usual smp shutdown function, which
121 * unfortunately means it may not be hardened to work in a panic
122 * situation.
123 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 smp_send_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Seiji Aguchi62be73e2012-05-15 17:35:09 -0400126 kmsg_dump(KMSG_DUMP_PANIC);
127
Alan Sterne041c682006-03-27 01:16:30 -0800128 atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Aaro Koskinend014e882009-10-02 14:41:20 +0300130 bust_spinlocks(0);
131
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700132 if (!panic_blink)
133 panic_blink = no_blink;
134
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700135 if (panic_timeout > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100137 * Delay timeout seconds before rebooting the machine.
138 * We can't use the "normal" timers since we just panicked.
139 */
140 printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
141
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700142 for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 touch_nmi_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700144 if (i >= i_next) {
145 i += panic_blink(state ^= 1);
146 i_next = i + 3600 / PANIC_BLINK_SPD;
147 }
148 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
Hugh Dickins4302fbc2011-07-26 16:08:52 -0700150 }
151 if (panic_timeout != 0) {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100152 /*
153 * This will not be a clean reboot, with everything
154 * shutting down. But if there is a chance of
155 * rebooting the system it will be rebooted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 */
Eric W. Biederman2f048ea2005-07-26 11:49:23 -0600157 emergency_restart();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 }
159#ifdef __sparc__
160 {
161 extern int stop_a_enabled;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700162 /* Make sure the user can actually press Stop-A (L1-A) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 stop_a_enabled = 1;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700164 printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166#endif
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800167#if defined(CONFIG_S390)
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100168 {
169 unsigned long caller;
170
171 caller = (unsigned long)__builtin_return_address(0);
172 disabled_wait(caller);
173 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#endif
175 local_irq_enable();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700176 for (i = 0; ; i += PANIC_TIMER_STEP) {
Jan Beulichc22db942006-02-10 01:51:11 -0800177 touch_softlockup_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700178 if (i >= i_next) {
179 i += panic_blink(state ^= 1);
180 i_next = i + 3600 / PANIC_BLINK_SPD;
181 }
182 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184}
185
186EXPORT_SYMBOL(panic);
187
Daniel Walkerc277e632007-10-18 03:06:08 -0700188
Andi Kleen25ddbb12008-10-15 22:01:41 -0700189struct tnt {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100190 u8 bit;
191 char true;
192 char false;
Andi Kleen25ddbb12008-10-15 22:01:41 -0700193};
194
195static const struct tnt tnts[] = {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100196 { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
197 { TAINT_FORCED_MODULE, 'F', ' ' },
198 { TAINT_UNSAFE_SMP, 'S', ' ' },
199 { TAINT_FORCED_RMMOD, 'R', ' ' },
200 { TAINT_MACHINE_CHECK, 'M', ' ' },
201 { TAINT_BAD_PAGE, 'B', ' ' },
202 { TAINT_USER, 'U', ' ' },
203 { TAINT_DIE, 'D', ' ' },
204 { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
205 { TAINT_WARN, 'W', ' ' },
206 { TAINT_CRAP, 'C', ' ' },
Ben Hutchings92946bc2010-04-03 19:36:42 +0100207 { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200208 { TAINT_OOT_MODULE, 'O', ' ' },
Andi Kleen25ddbb12008-10-15 22:01:41 -0700209};
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211/**
212 * print_tainted - return a string to represent the kernel taint state.
213 *
214 * 'P' - Proprietary module has been loaded.
215 * 'F' - Module has been forcibly loaded.
216 * 'S' - SMP with CPUs not designed for SMP.
217 * 'R' - User forced a module unload.
218 * 'M' - System experienced a machine check exception.
219 * 'B' - System has hit bad_page.
220 * 'U' - Userspace-defined naughtiness.
Arjan van de Vena8005992008-12-01 13:14:00 -0800221 * 'D' - Kernel has oopsed before
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 * 'A' - ACPI table overridden.
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800223 * 'W' - Taint on warning.
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -0700224 * 'C' - modules from drivers/staging are loaded.
Ben Hutchings92946bc2010-04-03 19:36:42 +0100225 * 'I' - Working around severe firmware bug.
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200226 * 'O' - Out-of-tree module has been loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 *
Robert P. J. Dayfe002a42009-06-28 21:10:07 -0400228 * The string is overwritten by the next call to print_tainted().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230const char *print_tainted(void)
231{
Andi Kleen25ddbb12008-10-15 22:01:41 -0700232 static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
233
234 if (tainted_mask) {
235 char *s;
236 int i;
237
238 s = buf + sprintf(buf, "Tainted: ");
239 for (i = 0; i < ARRAY_SIZE(tnts); i++) {
240 const struct tnt *t = &tnts[i];
241 *s++ = test_bit(t->bit, &tainted_mask) ?
242 t->true : t->false;
243 }
244 *s = 0;
245 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 snprintf(buf, sizeof(buf), "Not tainted");
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100247
248 return buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
Andi Kleen25ddbb12008-10-15 22:01:41 -0700251int test_taint(unsigned flag)
252{
253 return test_bit(flag, &tainted_mask);
254}
255EXPORT_SYMBOL(test_taint);
256
257unsigned long get_taint(void)
258{
259 return tainted_mask;
260}
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262void add_taint(unsigned flag)
263{
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200264 /*
265 * Can't trust the integrity of the kernel anymore.
266 * We don't call directly debug_locks_off() because the issue
267 * is not necessarily serious enough to set oops_in_progress to 1
Ben Hutchings9ec84ac2011-12-07 14:30:58 +0000268 * Also we want to keep up lockdep for staging/out-of-tree
269 * development and post-warning case.
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200270 */
Peter Zijlstradf754e62011-11-14 13:13:49 +0100271 switch (flag) {
272 case TAINT_CRAP:
Ben Hutchings9ec84ac2011-12-07 14:30:58 +0000273 case TAINT_OOT_MODULE:
Peter Zijlstradf754e62011-11-14 13:13:49 +0100274 case TAINT_WARN:
275 case TAINT_FIRMWARE_WORKAROUND:
276 break;
277
278 default:
279 if (__debug_locks_off())
280 printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
281 }
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200282
Andi Kleen25ddbb12008-10-15 22:01:41 -0700283 set_bit(flag, &tainted_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285EXPORT_SYMBOL(add_taint);
Andrew Mortondd287792006-03-23 03:00:57 -0800286
Andrew Mortondd287792006-03-23 03:00:57 -0800287static void spin_msec(int msecs)
288{
289 int i;
290
291 for (i = 0; i < msecs; i++) {
292 touch_nmi_watchdog();
293 mdelay(1);
294 }
295}
296
297/*
298 * It just happens that oops_enter() and oops_exit() are identically
299 * implemented...
300 */
301static void do_oops_enter_exit(void)
302{
303 unsigned long flags;
304 static int spin_counter;
305
306 if (!pause_on_oops)
307 return;
308
309 spin_lock_irqsave(&pause_on_oops_lock, flags);
310 if (pause_on_oops_flag == 0) {
311 /* This CPU may now print the oops message */
312 pause_on_oops_flag = 1;
313 } else {
314 /* We need to stall this CPU */
315 if (!spin_counter) {
316 /* This CPU gets to do the counting */
317 spin_counter = pause_on_oops;
318 do {
319 spin_unlock(&pause_on_oops_lock);
320 spin_msec(MSEC_PER_SEC);
321 spin_lock(&pause_on_oops_lock);
322 } while (--spin_counter);
323 pause_on_oops_flag = 0;
324 } else {
325 /* This CPU waits for a different one */
326 while (spin_counter) {
327 spin_unlock(&pause_on_oops_lock);
328 spin_msec(1);
329 spin_lock(&pause_on_oops_lock);
330 }
331 }
332 }
333 spin_unlock_irqrestore(&pause_on_oops_lock, flags);
334}
335
336/*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100337 * Return true if the calling CPU is allowed to print oops-related info.
338 * This is a bit racy..
Andrew Mortondd287792006-03-23 03:00:57 -0800339 */
340int oops_may_print(void)
341{
342 return pause_on_oops_flag == 0;
343}
344
345/*
346 * Called when the architecture enters its oops handler, before it prints
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100347 * anything. If this is the first CPU to oops, and it's oopsing the first
348 * time then let it proceed.
Andrew Mortondd287792006-03-23 03:00:57 -0800349 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100350 * This is all enabled by the pause_on_oops kernel boot option. We do all
351 * this to ensure that oopses don't scroll off the screen. It has the
352 * side-effect of preventing later-oopsing CPUs from mucking up the display,
353 * too.
Andrew Mortondd287792006-03-23 03:00:57 -0800354 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100355 * It turns out that the CPU which is allowed to print ends up pausing for
356 * the right duration, whereas all the other CPUs pause for twice as long:
357 * once in oops_enter(), once in oops_exit().
Andrew Mortondd287792006-03-23 03:00:57 -0800358 */
359void oops_enter(void)
360{
Thomas Gleixnerbdff7872009-07-24 15:30:45 -0400361 tracing_off();
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100362 /* can't trust the integrity of the kernel anymore: */
363 debug_locks_off();
Andrew Mortondd287792006-03-23 03:00:57 -0800364 do_oops_enter_exit();
365}
366
367/*
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100368 * 64-bit random ID for oopses:
369 */
370static u64 oops_id;
371
372static int init_oops_id(void)
373{
374 if (!oops_id)
375 get_random_bytes(&oops_id, sizeof(oops_id));
Arjan van de Vend6624f92009-01-06 14:40:54 -0800376 else
377 oops_id++;
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100378
379 return 0;
380}
381late_initcall(init_oops_id);
382
Anton Blanchard863a6042010-08-10 18:03:30 -0700383void print_oops_end_marker(void)
Arjan van de Ven71c33912008-01-30 13:32:50 +0100384{
385 init_oops_id();
386 printk(KERN_WARNING "---[ end trace %016llx ]---\n",
387 (unsigned long long)oops_id);
388}
389
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100390/*
Andrew Mortondd287792006-03-23 03:00:57 -0800391 * Called when the architecture exits its oops handler, after printing
392 * everything.
393 */
394void oops_exit(void)
395{
396 do_oops_enter_exit();
Arjan van de Ven71c33912008-01-30 13:32:50 +0100397 print_oops_end_marker();
Simon Kagstrom456b5652009-10-16 14:09:18 +0200398 kmsg_dump(KMSG_DUMP_OOPS);
Andrew Mortondd287792006-03-23 03:00:57 -0800399}
Arjan van de Ven3162f752006-09-26 10:52:39 +0200400
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100401#ifdef WANT_WARN_ON_SLOWPATH
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700402struct slowpath_args {
403 const char *fmt;
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700404 va_list args;
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700405};
406
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100407static void warn_slowpath_common(const char *file, int line, void *caller,
408 unsigned taint, struct slowpath_args *args)
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700409{
Arjan van de Venbd89bb22008-11-28 08:36:09 -0800410 const char *board;
411
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700412 printk(KERN_WARNING "------------[ cut here ]------------\n");
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700413 printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
Arjan van de Venbd89bb22008-11-28 08:36:09 -0800414 board = dmi_get_system_info(DMI_PRODUCT_NAME);
415 if (board)
416 printk(KERN_WARNING "Hardware name: %s\n", board);
Arjan van de Ven74853db2008-11-28 08:35:25 -0800417
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700418 if (args)
419 vprintk(args->fmt, args->args);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700420
421 print_modules();
422 dump_stack();
423 print_oops_end_marker();
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100424 add_taint(taint);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700425}
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700426
427void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
428{
429 struct slowpath_args args;
430
431 args.fmt = fmt;
432 va_start(args.args, fmt);
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100433 warn_slowpath_common(file, line, __builtin_return_address(0),
434 TAINT_WARN, &args);
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700435 va_end(args.args);
436}
Andi Kleen57adc4d2009-05-06 16:02:53 -0700437EXPORT_SYMBOL(warn_slowpath_fmt);
438
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100439void warn_slowpath_fmt_taint(const char *file, int line,
440 unsigned taint, const char *fmt, ...)
441{
442 struct slowpath_args args;
443
444 args.fmt = fmt;
445 va_start(args.args, fmt);
446 warn_slowpath_common(file, line, __builtin_return_address(0),
447 taint, &args);
448 va_end(args.args);
449}
450EXPORT_SYMBOL(warn_slowpath_fmt_taint);
451
Andi Kleen57adc4d2009-05-06 16:02:53 -0700452void warn_slowpath_null(const char *file, int line)
453{
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100454 warn_slowpath_common(file, line, __builtin_return_address(0),
455 TAINT_WARN, NULL);
Andi Kleen57adc4d2009-05-06 16:02:53 -0700456}
457EXPORT_SYMBOL(warn_slowpath_null);
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100458#endif
459
Arjan van de Ven3162f752006-09-26 10:52:39 +0200460#ifdef CONFIG_CC_STACKPROTECTOR
Arjan van de Ven54371a42008-02-15 15:33:12 -0800461
Arjan van de Ven3162f752006-09-26 10:52:39 +0200462/*
463 * Called when gcc's -fstack-protector feature is used, and
464 * gcc detects corruption of the on-stack canary value
465 */
466void __stack_chk_fail(void)
467{
Ingo Molnar517a92c2008-02-14 09:02:13 +0100468 panic("stack-protector: Kernel stack is corrupted in: %p\n",
469 __builtin_return_address(0));
Arjan van de Ven3162f752006-09-26 10:52:39 +0200470}
471EXPORT_SYMBOL(__stack_chk_fail);
Arjan van de Ven54371a42008-02-15 15:33:12 -0800472
Arjan van de Ven3162f752006-09-26 10:52:39 +0200473#endif
Rusty Russellf44dd162008-10-22 10:00:24 -0500474
475core_param(panic, panic_timeout, int, 0644);
476core_param(pause_on_oops, pause_on_oops, int, 0644);
Olaf Heringd404ab02011-03-22 16:34:04 -0700477
478static int __init oops_setup(char *s)
479{
480 if (!s)
481 return -EINVAL;
482 if (!strcmp(s, "panic"))
483 panic_on_oops = 1;
484 return 0;
485}
486early_param("oops", oops_setup);