[net-next-2.6.git] / kernel / panic.c

/*
 *  linux/kernel/panic.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/*
 * This function is used through-out the kernel (including mm and fs)
 * to indicate a major problem.
 */
#include <linux/debug_locks.h>
#include <linux/interrupt.h>
#include <linux/kmsg_dump.h>
#include <linux/kallsyms.h>
#include <linux/notifier.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/kexec.h>
#include <linux/sched.h>
#include <linux/sysrq.h>
#include <linux/init.h>
#include <linux/nmi.h>
#include <linux/dmi.h>

int panic_on_oops;
static unsigned long tainted_mask;
static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);

int panic_timeout;

ATOMIC_NOTIFIER_HEAD(panic_notifier_list);

EXPORT_SYMBOL(panic_notifier_list);

/* Returns how long it waited in ms */
long (*panic_blink)(long time);
EXPORT_SYMBOL(panic_blink);

static void panic_blink_one_second(void)
{
	static long i = 0, end;

	if (panic_blink) {
		end = i + MSEC_PER_SEC;

		while (i < end) {
			i += panic_blink(i);
			mdelay(1);
			i++;
		}
	} else {
		/*
		 * When running under a hypervisor a small mdelay may get
		 * rounded up to the hypervisor timeslice. For example, with
		 * a 1ms in 10ms hypervisor timeslice we might inflate a
		 * mdelay(1) loop by 10x.
		 *
		 * If we have nothing to blink, spin on 1 second calls to
		 * mdelay to avoid this.
		 */
		mdelay(MSEC_PER_SEC);
	}
}

/**
 *	panic - halt the system
 *	@fmt: The text string to print
 *
 *	Display a message, then perform cleanups.
 *
 *	This function never returns.
 */
NORET_TYPE void panic(const char * fmt, ...)
{
	static char buf[1024];
	va_list args;
	long i;

	/*
	 * It's possible to come here directly from a panic-assertion and
	 * not have preempt disabled. Some functions called from here want
	 * preempt to be disabled. No point enabling it later though...
	 */
	preempt_disable();

	console_verbose();
	bust_spinlocks(1);
	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
#ifdef CONFIG_DEBUG_BUGVERBOSE
	dump_stack();
#endif

	/*
	 * If we have crashed and we have a crash kernel loaded let it handle
	 * everything else.
	 * Do we want to call this before we try to display a message?
	 */
	crash_kexec(NULL);

	kmsg_dump(KMSG_DUMP_PANIC);

	/*
	 * Note smp_send_stop is the usual smp shutdown function, which
	 * unfortunately means it may not be hardened to work in a panic
	 * situation.
	 */
	smp_send_stop();

	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);

	bust_spinlocks(0);

	if (panic_timeout > 0) {
		/*
		 * Delay timeout seconds before rebooting the machine.
		 * We can't use the "normal" timers since we just panicked.
		 */
		printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);

		for (i = 0; i < panic_timeout; i++) {
			touch_nmi_watchdog();
			panic_blink_one_second();
		}
		/*
		 * This will not be a clean reboot, with everything
		 * shutting down.  But if there is a chance of
		 * rebooting the system it will be rebooted.
		 */
		emergency_restart();
	}
#ifdef __sparc__
	{
		extern int stop_a_enabled;
		/* Make sure the user can actually press Stop-A (L1-A) */
		stop_a_enabled = 1;
		printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
	}
#endif
#if defined(CONFIG_S390)
	{
		unsigned long caller;

		caller = (unsigned long)__builtin_return_address(0);
		disabled_wait(caller);
	}
#endif
	local_irq_enable();
	while (1) {
		touch_softlockup_watchdog();
		panic_blink_one_second();
	}
}

EXPORT_SYMBOL(panic);


struct tnt {
	u8	bit;
	char	true;
	char	false;
};

static const struct tnt tnts[] = {
	{ TAINT_PROPRIETARY_MODULE,	'P', 'G' },
	{ TAINT_FORCED_MODULE,		'F', ' ' },
	{ TAINT_UNSAFE_SMP,		'S', ' ' },
	{ TAINT_FORCED_RMMOD,		'R', ' ' },
	{ TAINT_MACHINE_CHECK,		'M', ' ' },
	{ TAINT_BAD_PAGE,		'B', ' ' },
	{ TAINT_USER,			'U', ' ' },
	{ TAINT_DIE,			'D', ' ' },
	{ TAINT_OVERRIDDEN_ACPI_TABLE,	'A', ' ' },
	{ TAINT_WARN,			'W', ' ' },
	{ TAINT_CRAP,			'C', ' ' },
	{ TAINT_FIRMWARE_WORKAROUND,	'I', ' ' },
};

/**
 *	print_tainted - return a string to represent the kernel taint state.
 *
 *  'P' - Proprietary module has been loaded.
 *  'F' - Module has been forcibly loaded.
 *  'S' - SMP with CPUs not designed for SMP.
 *  'R' - User forced a module unload.
 *  'M' - System experienced a machine check exception.
 *  'B' - System has hit bad_page.
 *  'U' - Userspace-defined naughtiness.
 *  'D' - Kernel has oopsed before
 *  'A' - ACPI table overridden.
 *  'W' - Taint on warning.
 *  'C' - modules from drivers/staging are loaded.
 *  'I' - Working around severe firmware bug.
 *
 *	The string is overwritten by the next call to print_tainted().
 */
const char *print_tainted(void)
{
	static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];

	if (tainted_mask) {
		char *s;
		int i;

		s = buf + sprintf(buf, "Tainted: ");
		for (i = 0; i < ARRAY_SIZE(tnts); i++) {
			const struct tnt *t = &tnts[i];
			*s++ = test_bit(t->bit, &tainted_mask) ?
					t->true : t->false;
		}
		*s = 0;
	} else
		snprintf(buf, sizeof(buf), "Not tainted");

	return buf;
}

int test_taint(unsigned flag)
{
	return test_bit(flag, &tainted_mask);
}
EXPORT_SYMBOL(test_taint);

unsigned long get_taint(void)
{
	return tainted_mask;
}

void add_taint(unsigned flag)
{
	/*
	 * Can't trust the integrity of the kernel anymore.
	 * We don't call directly debug_locks_off() because the issue
	 * is not necessarily serious enough to set oops_in_progress to 1
	 * Also we want to keep up lockdep for staging development and
	 * post-warning case.
	 */
	if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off())
		printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");

	set_bit(flag, &tainted_mask);
}
EXPORT_SYMBOL(add_taint);

static void spin_msec(int msecs)
{
	int i;

	for (i = 0; i < msecs; i++) {
		touch_nmi_watchdog();
		mdelay(1);
	}
}

/*
 * It just happens that oops_enter() and oops_exit() are identically
 * implemented...
 */
static void do_oops_enter_exit(void)
{
	unsigned long flags;
	static int spin_counter;

	if (!pause_on_oops)
		return;

	spin_lock_irqsave(&pause_on_oops_lock, flags);
	if (pause_on_oops_flag == 0) {
		/* This CPU may now print the oops message */
		pause_on_oops_flag = 1;
	} else {
		/* We need to stall this CPU */
		if (!spin_counter) {
			/* This CPU gets to do the counting */
			spin_counter = pause_on_oops;
			do {
				spin_unlock(&pause_on_oops_lock);
				spin_msec(MSEC_PER_SEC);
				spin_lock(&pause_on_oops_lock);
			} while (--spin_counter);
			pause_on_oops_flag = 0;
		} else {
			/* This CPU waits for a different one */
			while (spin_counter) {
				spin_unlock(&pause_on_oops_lock);
				spin_msec(1);
				spin_lock(&pause_on_oops_lock);
			}
		}
	}
	spin_unlock_irqrestore(&pause_on_oops_lock, flags);
}

/*
 * Return true if the calling CPU is allowed to print oops-related info.
 * This is a bit racy..
 */
int oops_may_print(void)
{
	return pause_on_oops_flag == 0;
}

/*
 * Called when the architecture enters its oops handler, before it prints
 * anything.  If this is the first CPU to oops, and it's oopsing the first
 * time then let it proceed.
 *
 * This is all enabled by the pause_on_oops kernel boot option.  We do all
 * this to ensure that oopses don't scroll off the screen.  It has the
 * side-effect of preventing later-oopsing CPUs from mucking up the display,
 * too.
 *
 * It turns out that the CPU which is allowed to print ends up pausing for
 * the right duration, whereas all the other CPUs pause for twice as long:
 * once in oops_enter(), once in oops_exit().
 */
void oops_enter(void)
{
	tracing_off();
	/* can't trust the integrity of the kernel anymore: */
	debug_locks_off();
	do_oops_enter_exit();
}

/*
 * 64-bit random ID for oopses:
 */
static u64 oops_id;

static int init_oops_id(void)
{
	if (!oops_id)
		get_random_bytes(&oops_id, sizeof(oops_id));
	else
		oops_id++;

	return 0;
}
late_initcall(init_oops_id);

static void print_oops_end_marker(void)
{
	init_oops_id();
	printk(KERN_WARNING "---[ end trace %016llx ]---\n",
		(unsigned long long)oops_id);
}

/*
 * Called when the architecture exits its oops handler, after printing
 * everything.
 */
void oops_exit(void)
{
	do_oops_enter_exit();
	print_oops_end_marker();
	kmsg_dump(KMSG_DUMP_OOPS);
}

#ifdef WANT_WARN_ON_SLOWPATH
struct slowpath_args {
	const char *fmt;
	va_list args;
};

static void warn_slowpath_common(const char *file, int line, void *caller,
				 unsigned taint, struct slowpath_args *args)
{
	const char *board;

	printk(KERN_WARNING "------------[ cut here ]------------\n");
	printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
	board = dmi_get_system_info(DMI_PRODUCT_NAME);
	if (board)
		printk(KERN_WARNING "Hardware name: %s\n", board);

	if (args)
		vprintk(args->fmt, args->args);

	print_modules();
	dump_stack();
	print_oops_end_marker();
	add_taint(taint);
}

void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
{
	struct slowpath_args args;

	args.fmt = fmt;
	va_start(args.args, fmt);
	warn_slowpath_common(file, line, __builtin_return_address(0),
			     TAINT_WARN, &args);
	va_end(args.args);
}
EXPORT_SYMBOL(warn_slowpath_fmt);

void warn_slowpath_fmt_taint(const char *file, int line,
			     unsigned taint, const char *fmt, ...)
{
	struct slowpath_args args;

	args.fmt = fmt;
	va_start(args.args, fmt);
	warn_slowpath_common(file, line, __builtin_return_address(0),
			     taint, &args);
	va_end(args.args);
}
EXPORT_SYMBOL(warn_slowpath_fmt_taint);

void warn_slowpath_null(const char *file, int line)
{
	warn_slowpath_common(file, line, __builtin_return_address(0),
			     TAINT_WARN, NULL);
}
EXPORT_SYMBOL(warn_slowpath_null);
#endif

#ifdef CONFIG_CC_STACKPROTECTOR

/*
 * Called when gcc's -fstack-protector feature is used, and
 * gcc detects corruption of the on-stack canary value
 */
void __stack_chk_fail(void)
{
	panic("stack-protector: Kernel stack is corrupted in: %p\n",
		__builtin_return_address(0));
}
EXPORT_SYMBOL(__stack_chk_fail);

#endif

core_param(panic, panic_timeout, int, 0644);
core_param(pause_on_oops, pause_on_oops, int, 0644);
Commit	Line	Data
	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/debug_locks.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/kmsg_dump.h>
	14	#include <linux/kallsyms.h>
	15	#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>
	25	#include <linux/dmi.h>
	26
	27	int panic_on_oops;
	28	static unsigned long tainted_mask;
	29	static int pause_on_oops;
	30	static int pause_on_oops_flag;
	31	static DEFINE_SPINLOCK(pause_on_oops_lock);
	32
	33	int panic_timeout;
	34
	35	ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
	36
	37	EXPORT_SYMBOL(panic_notifier_list);
	38
	39	/* Returns how long it waited in ms */
	40	long (*panic_blink)(long time);
	41	EXPORT_SYMBOL(panic_blink);
	42
	43	static void panic_blink_one_second(void)
	44	{
	45	static long i = 0, end;
	46
	47	if (panic_blink) {
	48	end = i + MSEC_PER_SEC;
	49
	50	while (i < end) {
	51	i += panic_blink(i);
	52	mdelay(1);
	53	i++;
	54	}
	55	} else {
	56	/*
	57	* When running under a hypervisor a small mdelay may get
	58	* rounded up to the hypervisor timeslice. For example, with
	59	* a 1ms in 10ms hypervisor timeslice we might inflate a
	60	* mdelay(1) loop by 10x.
	61	*
	62	* If we have nothing to blink, spin on 1 second calls to
	63	* mdelay to avoid this.
	64	*/
	65	mdelay(MSEC_PER_SEC);
	66	}
	67	}
	68
	69	/**
	70	* panic - halt the system
	71	* @fmt: The text string to print
	72	*
	73	* Display a message, then perform cleanups.
	74	*
	75	* This function never returns.
	76	*/
	77	NORET_TYPE void panic(const char * fmt, ...)
	78	{
	79	static char buf[1024];
	80	va_list args;
	81	long i;
	82
	83	/*
	84	* It's possible to come here directly from a panic-assertion and
	85	* not have preempt disabled. Some functions called from here want
	86	* preempt to be disabled. No point enabling it later though...
	87	*/
	88	preempt_disable();
	89
	90	console_verbose();
	91	bust_spinlocks(1);
	92	va_start(args, fmt);
	93	vsnprintf(buf, sizeof(buf), fmt, args);
	94	va_end(args);
	95	printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
	96	#ifdef CONFIG_DEBUG_BUGVERBOSE
	97	dump_stack();
	98	#endif
	99
	100	/*
	101	* If we have crashed and we have a crash kernel loaded let it handle
	102	* everything else.
	103	* Do we want to call this before we try to display a message?
	104	*/
	105	crash_kexec(NULL);
	106
	107	kmsg_dump(KMSG_DUMP_PANIC);
	108
	109	/*
	110	* Note smp_send_stop is the usual smp shutdown function, which
	111	* unfortunately means it may not be hardened to work in a panic
	112	* situation.
	113	*/
	114	smp_send_stop();
	115
	116	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
	117
	118	bust_spinlocks(0);
	119
	120	if (panic_timeout > 0) {
	121	/*
	122	* Delay timeout seconds before rebooting the machine.
	123	* We can't use the "normal" timers since we just panicked.
	124	*/
	125	printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
	126
	127	for (i = 0; i < panic_timeout; i++) {
	128	touch_nmi_watchdog();
	129	panic_blink_one_second();
	130	}
	131	/*
	132	* This will not be a clean reboot, with everything
	133	* shutting down. But if there is a chance of
	134	* rebooting the system it will be rebooted.
	135	*/
	136	emergency_restart();
	137	}
	138	#ifdef __sparc__
	139	{
	140	extern int stop_a_enabled;
	141	/* Make sure the user can actually press Stop-A (L1-A) */
	142	stop_a_enabled = 1;
	143	printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
	144	}
	145	#endif
	146	#if defined(CONFIG_S390)
	147	{
	148	unsigned long caller;
	149
	150	caller = (unsigned long)__builtin_return_address(0);
	151	disabled_wait(caller);
	152	}
	153	#endif
	154	local_irq_enable();
	155	while (1) {
	156	touch_softlockup_watchdog();
	157	panic_blink_one_second();
	158	}
	159	}
	160
	161	EXPORT_SYMBOL(panic);
	162
	163
	164	struct tnt {
	165	u8 bit;
	166	char true;
	167	char false;
	168	};
	169
	170	static const struct tnt tnts[] = {
	171	{ TAINT_PROPRIETARY_MODULE, 'P', 'G' },
	172	{ TAINT_FORCED_MODULE, 'F', ' ' },
	173	{ TAINT_UNSAFE_SMP, 'S', ' ' },
	174	{ TAINT_FORCED_RMMOD, 'R', ' ' },
	175	{ TAINT_MACHINE_CHECK, 'M', ' ' },
	176	{ TAINT_BAD_PAGE, 'B', ' ' },
	177	{ TAINT_USER, 'U', ' ' },
	178	{ TAINT_DIE, 'D', ' ' },
	179	{ TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
	180	{ TAINT_WARN, 'W', ' ' },
	181	{ TAINT_CRAP, 'C', ' ' },
	182	{ TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
	183	};
	184
	185	/**
	186	* print_tainted - return a string to represent the kernel taint state.
	187	*
	188	* 'P' - Proprietary module has been loaded.
	189	* 'F' - Module has been forcibly loaded.
	190	* 'S' - SMP with CPUs not designed for SMP.
	191	* 'R' - User forced a module unload.
	192	* 'M' - System experienced a machine check exception.
	193	* 'B' - System has hit bad_page.
	194	* 'U' - Userspace-defined naughtiness.
	195	* 'D' - Kernel has oopsed before
	196	* 'A' - ACPI table overridden.
	197	* 'W' - Taint on warning.
	198	* 'C' - modules from drivers/staging are loaded.
	199	* 'I' - Working around severe firmware bug.
	200	*
	201	* The string is overwritten by the next call to print_tainted().
	202	*/
	203	const char *print_tainted(void)
	204	{
	205	static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
	206
	207	if (tainted_mask) {
	208	char *s;
	209	int i;
	210
	211	s = buf + sprintf(buf, "Tainted: ");
	212	for (i = 0; i < ARRAY_SIZE(tnts); i++) {
	213	const struct tnt *t = &tnts[i];
	214	*s++ = test_bit(t->bit, &tainted_mask) ?
	215	t->true : t->false;
	216	}
	217	*s = 0;
	218	} else
	219	snprintf(buf, sizeof(buf), "Not tainted");
	220
	221	return buf;
	222	}
	223
	224	int test_taint(unsigned flag)
	225	{
	226	return test_bit(flag, &tainted_mask);
	227	}
	228	EXPORT_SYMBOL(test_taint);
	229
	230	unsigned long get_taint(void)
	231	{
	232	return tainted_mask;
	233	}
	234
	235	void add_taint(unsigned flag)
	236	{
	237	/*
	238	* Can't trust the integrity of the kernel anymore.
	239	* We don't call directly debug_locks_off() because the issue
	240	* is not necessarily serious enough to set oops_in_progress to 1
	241	* Also we want to keep up lockdep for staging development and
	242	* post-warning case.
	243	*/
	244	if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off())
	245	printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
	246
	247	set_bit(flag, &tainted_mask);
	248	}
	249	EXPORT_SYMBOL(add_taint);
	250
	251	static void spin_msec(int msecs)
	252	{
	253	int i;
	254
	255	for (i = 0; i < msecs; i++) {
	256	touch_nmi_watchdog();
	257	mdelay(1);
	258	}
	259	}
	260
	261	/*
	262	* It just happens that oops_enter() and oops_exit() are identically
	263	* implemented...
	264	*/
	265	static void do_oops_enter_exit(void)
	266	{
	267	unsigned long flags;
	268	static int spin_counter;
	269
	270	if (!pause_on_oops)
	271	return;
	272
	273	spin_lock_irqsave(&pause_on_oops_lock, flags);
	274	if (pause_on_oops_flag == 0) {
	275	/* This CPU may now print the oops message */
	276	pause_on_oops_flag = 1;
	277	} else {
	278	/* We need to stall this CPU */
	279	if (!spin_counter) {
	280	/* This CPU gets to do the counting */
	281	spin_counter = pause_on_oops;
	282	do {
	283	spin_unlock(&pause_on_oops_lock);
	284	spin_msec(MSEC_PER_SEC);
	285	spin_lock(&pause_on_oops_lock);
	286	} while (--spin_counter);
	287	pause_on_oops_flag = 0;
	288	} else {
	289	/* This CPU waits for a different one */
	290	while (spin_counter) {
	291	spin_unlock(&pause_on_oops_lock);
	292	spin_msec(1);
	293	spin_lock(&pause_on_oops_lock);
	294	}
	295	}
	296	}
	297	spin_unlock_irqrestore(&pause_on_oops_lock, flags);
	298	}
	299
	300	/*
	301	* Return true if the calling CPU is allowed to print oops-related info.
	302	* This is a bit racy..
	303	*/
	304	int oops_may_print(void)
	305	{
	306	return pause_on_oops_flag == 0;
	307	}
	308
	309	/*
	310	* Called when the architecture enters its oops handler, before it prints
	311	* anything. If this is the first CPU to oops, and it's oopsing the first
	312	* time then let it proceed.
	313	*
	314	* This is all enabled by the pause_on_oops kernel boot option. We do all
	315	* this to ensure that oopses don't scroll off the screen. It has the
	316	* side-effect of preventing later-oopsing CPUs from mucking up the display,
	317	* too.
	318	*
	319	* It turns out that the CPU which is allowed to print ends up pausing for
	320	* the right duration, whereas all the other CPUs pause for twice as long:
	321	* once in oops_enter(), once in oops_exit().
	322	*/
	323	void oops_enter(void)
	324	{
	325	tracing_off();
	326	/* can't trust the integrity of the kernel anymore: */
	327	debug_locks_off();
	328	do_oops_enter_exit();
	329	}
	330
	331	/*
	332	* 64-bit random ID for oopses:
	333	*/
	334	static u64 oops_id;
	335
	336	static int init_oops_id(void)
	337	{
	338	if (!oops_id)
	339	get_random_bytes(&oops_id, sizeof(oops_id));
	340	else
	341	oops_id++;
	342
	343	return 0;
	344	}
	345	late_initcall(init_oops_id);
	346
	347	static void print_oops_end_marker(void)
	348	{
	349	init_oops_id();
	350	printk(KERN_WARNING "---[ end trace %016llx ]---\n",
	351	(unsigned long long)oops_id);
	352	}
	353
	354	/*
	355	* Called when the architecture exits its oops handler, after printing
	356	* everything.
	357	*/
	358	void oops_exit(void)
	359	{
	360	do_oops_enter_exit();
	361	print_oops_end_marker();
	362	kmsg_dump(KMSG_DUMP_OOPS);
	363	}
	364
	365	#ifdef WANT_WARN_ON_SLOWPATH
	366	struct slowpath_args {
	367	const char *fmt;
	368	va_list args;
	369	};
	370
	371	static void warn_slowpath_common(const char file, int line, void caller,
	372	unsigned taint, struct slowpath_args *args)
	373	{
	374	const char *board;
	375
	376	printk(KERN_WARNING "------------[ cut here ]------------\n");
	377	printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
	378	board = dmi_get_system_info(DMI_PRODUCT_NAME);
	379	if (board)
	380	printk(KERN_WARNING "Hardware name: %s\n", board);
	381
	382	if (args)
	383	vprintk(args->fmt, args->args);
	384
	385	print_modules();
	386	dump_stack();
	387	print_oops_end_marker();
	388	add_taint(taint);
	389	}
	390
	391	void warn_slowpath_fmt(const char file, int line, const char fmt, ...)
	392	{
	393	struct slowpath_args args;
	394
	395	args.fmt = fmt;
	396	va_start(args.args, fmt);
	397	warn_slowpath_common(file, line, __builtin_return_address(0),
	398	TAINT_WARN, &args);
	399	va_end(args.args);
	400	}
	401	EXPORT_SYMBOL(warn_slowpath_fmt);
	402
	403	void warn_slowpath_fmt_taint(const char *file, int line,
	404	unsigned taint, const char *fmt, ...)
	405	{
	406	struct slowpath_args args;
	407
	408	args.fmt = fmt;
	409	va_start(args.args, fmt);
	410	warn_slowpath_common(file, line, __builtin_return_address(0),
	411	taint, &args);
	412	va_end(args.args);
	413	}
	414	EXPORT_SYMBOL(warn_slowpath_fmt_taint);
	415
	416	void warn_slowpath_null(const char *file, int line)
	417	{
	418	warn_slowpath_common(file, line, __builtin_return_address(0),
	419	TAINT_WARN, NULL);
	420	}
	421	EXPORT_SYMBOL(warn_slowpath_null);
	422	#endif
	423
	424	#ifdef CONFIG_CC_STACKPROTECTOR
	425
	426	/*
	427	* Called when gcc's -fstack-protector feature is used, and
	428	* gcc detects corruption of the on-stack canary value
	429	*/
	430	void __stack_chk_fail(void)
	431	{
	432	panic("stack-protector: Kernel stack is corrupted in: %p\n",
	433	__builtin_return_address(0));
	434	}
	435	EXPORT_SYMBOL(__stack_chk_fail);
	436
	437	#endif
	438
	439	core_param(panic, panic_timeout, int, 0644);
	440	core_param(pause_on_oops, pause_on_oops, int, 0644);