[linux-2.6-block.git] / kernel / reboot.c

/*
 *  linux/kernel/reboot.c
 *
 *  Copyright (C) 2013  Linus Torvalds
 */

#define pr_fmt(fmt)	"reboot: " fmt

#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/kexec.h>
#include <linux/kmod.h>
#include <linux/kmsg_dump.h>
#include <linux/reboot.h>
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/syscore_ops.h>
#include <linux/uaccess.h>

/*
 * this indicates whether you can reboot with ctrl-alt-del: the default is yes
 */

int C_A_D = 1;
struct pid *cad_pid;
EXPORT_SYMBOL(cad_pid);

#if defined(CONFIG_ARM) || defined(CONFIG_UNICORE32)
#define DEFAULT_REBOOT_MODE		= REBOOT_HARD
#else
#define DEFAULT_REBOOT_MODE
#endif
enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;

int reboot_default;
int reboot_cpu;
enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;

/*
 * If set, this is used for preparing the system to power off.
 */

void (*pm_power_off_prepare)(void);

/**
 *	emergency_restart - reboot the system
 *
 *	Without shutting down any hardware or taking any locks
 *	reboot the system.  This is called when we know we are in
 *	trouble so this is our best effort to reboot.  This is
 *	safe to call in interrupt context.
 */
void emergency_restart(void)
{
	kmsg_dump(KMSG_DUMP_EMERG);
	machine_emergency_restart();
}
EXPORT_SYMBOL_GPL(emergency_restart);

void kernel_restart_prepare(char *cmd)
{
	blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
	system_state = SYSTEM_RESTART;
	usermodehelper_disable();
	device_shutdown();
}

/**
 *	register_reboot_notifier - Register function to be called at reboot time
 *	@nb: Info about notifier function to be called
 *
 *	Registers a function with the list of functions
 *	to be called at reboot time.
 *
 *	Currently always returns zero, as blocking_notifier_chain_register()
 *	always returns zero.
 */
int register_reboot_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&reboot_notifier_list, nb);
}
EXPORT_SYMBOL(register_reboot_notifier);

/**
 *	unregister_reboot_notifier - Unregister previously registered reboot notifier
 *	@nb: Hook to be unregistered
 *
 *	Unregisters a previously registered reboot
 *	notifier function.
 *
 *	Returns zero on success, or %-ENOENT on failure.
 */
int unregister_reboot_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
}
EXPORT_SYMBOL(unregister_reboot_notifier);

static void migrate_to_reboot_cpu(void)
{
	/* The boot cpu is always logical cpu 0 */
	int cpu = reboot_cpu;

	cpu_hotplug_disable();

	/* Make certain the cpu I'm about to reboot on is online */
	if (!cpu_online(cpu))
		cpu = cpumask_first(cpu_online_mask);

	/* Prevent races with other tasks migrating this task */
	current->flags |= PF_NO_SETAFFINITY;

	/* Make certain I only run on the appropriate processor */
	set_cpus_allowed_ptr(current, cpumask_of(cpu));
}

/**
 *	kernel_restart - reboot the system
 *	@cmd: pointer to buffer containing command to execute for restart
 *		or %NULL
 *
 *	Shutdown everything and perform a clean reboot.
 *	This is not safe to call in interrupt context.
 */
void kernel_restart(char *cmd)
{
	kernel_restart_prepare(cmd);
	migrate_to_reboot_cpu();
	syscore_shutdown();
	if (!cmd)
		pr_emerg("Restarting system\n");
	else
		pr_emerg("Restarting system with command '%s'\n", cmd);
	kmsg_dump(KMSG_DUMP_RESTART);
	machine_restart(cmd);
}
EXPORT_SYMBOL_GPL(kernel_restart);

static void kernel_shutdown_prepare(enum system_states state)
{
	blocking_notifier_call_chain(&reboot_notifier_list,
		(state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
	system_state = state;
	usermodehelper_disable();
	device_shutdown();
}
/**
 *	kernel_halt - halt the system
 *
 *	Shutdown everything and perform a clean system halt.
 */
void kernel_halt(void)
{
	kernel_shutdown_prepare(SYSTEM_HALT);
	migrate_to_reboot_cpu();
	syscore_shutdown();
	pr_emerg("System halted\n");
	kmsg_dump(KMSG_DUMP_HALT);
	machine_halt();
}
EXPORT_SYMBOL_GPL(kernel_halt);

/**
 *	kernel_power_off - power_off the system
 *
 *	Shutdown everything and perform a clean system power_off.
 */
void kernel_power_off(void)
{
	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
	if (pm_power_off_prepare)
		pm_power_off_prepare();
	migrate_to_reboot_cpu();
	syscore_shutdown();
	pr_emerg("Power down\n");
	kmsg_dump(KMSG_DUMP_POWEROFF);
	machine_power_off();
}
EXPORT_SYMBOL_GPL(kernel_power_off);

static DEFINE_MUTEX(reboot_mutex);

/*
 * Reboot system call: for obvious reasons only root may call it,
 * and even root needs to set up some magic numbers in the registers
 * so that some mistake won't make this reboot the whole machine.
 * You can also set the meaning of the ctrl-alt-del-key here.
 *
 * reboot doesn't sync: do that yourself before calling this.
 */
SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
		void __user *, arg)
{
	struct pid_namespace *pid_ns = task_active_pid_ns(current);
	char buffer[256];
	int ret = 0;

	/* We only trust the superuser with rebooting the system. */
	if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
		return -EPERM;

	/* For safety, we require "magic" arguments. */
	if (magic1 != LINUX_REBOOT_MAGIC1 ||
			(magic2 != LINUX_REBOOT_MAGIC2 &&
			magic2 != LINUX_REBOOT_MAGIC2A &&
			magic2 != LINUX_REBOOT_MAGIC2B &&
			magic2 != LINUX_REBOOT_MAGIC2C))
		return -EINVAL;

	/*
	 * If pid namespaces are enabled and the current task is in a child
	 * pid_namespace, the command is handled by reboot_pid_ns() which will
	 * call do_exit().
	 */
	ret = reboot_pid_ns(pid_ns, cmd);
	if (ret)
		return ret;

	/* Instead of trying to make the power_off code look like
	 * halt when pm_power_off is not set do it the easy way.
	 */
	if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
		cmd = LINUX_REBOOT_CMD_HALT;

	mutex_lock(&reboot_mutex);
	switch (cmd) {
	case LINUX_REBOOT_CMD_RESTART:
		kernel_restart(NULL);
		break;

	case LINUX_REBOOT_CMD_CAD_ON:
		C_A_D = 1;
		break;

	case LINUX_REBOOT_CMD_CAD_OFF:
		C_A_D = 0;
		break;

	case LINUX_REBOOT_CMD_HALT:
		kernel_halt();
		do_exit(0);
		panic("cannot halt");

	case LINUX_REBOOT_CMD_POWER_OFF:
		kernel_power_off();
		do_exit(0);
		break;

	case LINUX_REBOOT_CMD_RESTART2:
		ret = strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1);
		if (ret < 0) {
			ret = -EFAULT;
			break;
		}
		buffer[sizeof(buffer) - 1] = '\0';

		kernel_restart(buffer);
		break;

#ifdef CONFIG_KEXEC
	case LINUX_REBOOT_CMD_KEXEC:
		ret = kernel_kexec();
		break;
#endif

#ifdef CONFIG_HIBERNATION
	case LINUX_REBOOT_CMD_SW_SUSPEND:
		ret = hibernate();
		break;
#endif

	default:
		ret = -EINVAL;
		break;
	}
	mutex_unlock(&reboot_mutex);
	return ret;
}

static void deferred_cad(struct work_struct *dummy)
{
	kernel_restart(NULL);
}

/*
 * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
 * As it's called within an interrupt, it may NOT sync: the only choice
 * is whether to reboot at once, or just ignore the ctrl-alt-del.
 */
void ctrl_alt_del(void)
{
	static DECLARE_WORK(cad_work, deferred_cad);

	if (C_A_D)
		schedule_work(&cad_work);
	else
		kill_cad_pid(SIGINT, 1);
}

char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";

static int __orderly_poweroff(bool force)
{
	char **argv;
	static char *envp[] = {
		"HOME=/",
		"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
		NULL
	};
	int ret;

	argv = argv_split(GFP_KERNEL, poweroff_cmd, NULL);
	if (argv) {
		ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
		argv_free(argv);
	} else {
		ret = -ENOMEM;
	}

	if (ret && force) {
		pr_warn("Failed to start orderly shutdown: forcing the issue\n");
		/*
		 * I guess this should try to kick off some daemon to sync and
		 * poweroff asap.  Or not even bother syncing if we're doing an
		 * emergency shutdown?
		 */
		emergency_sync();
		kernel_power_off();
	}

	return ret;
}

static bool poweroff_force;

static void poweroff_work_func(struct work_struct *work)
{
	__orderly_poweroff(poweroff_force);
}

static DECLARE_WORK(poweroff_work, poweroff_work_func);

/**
 * orderly_poweroff - Trigger an orderly system poweroff
 * @force: force poweroff if command execution fails
 *
 * This may be called from any context to trigger a system shutdown.
 * If the orderly shutdown fails, it will force an immediate shutdown.
 */
int orderly_poweroff(bool force)
{
	if (force) /* do not override the pending "true" */
		poweroff_force = true;
	schedule_work(&poweroff_work);
	return 0;
}
EXPORT_SYMBOL_GPL(orderly_poweroff);

static int __init reboot_setup(char *str)
{
	for (;;) {
		/*
		 * Having anything passed on the command line via
		 * reboot= will cause us to disable DMI checking
		 * below.
		 */
		reboot_default = 0;

		switch (*str) {
		case 'w':
			reboot_mode = REBOOT_WARM;
			break;

		case 'c':
			reboot_mode = REBOOT_COLD;
			break;

		case 'h':
			reboot_mode = REBOOT_HARD;
			break;

		case 's':
			if (isdigit(*(str+1)))
				reboot_cpu = simple_strtoul(str+1, NULL, 0);
			else if (str[1] == 'm' && str[2] == 'p' &&
							isdigit(*(str+3)))
				reboot_cpu = simple_strtoul(str+3, NULL, 0);
			else
				reboot_mode = REBOOT_SOFT;
			break;

		case 'g':
			reboot_mode = REBOOT_GPIO;
			break;

		case 'b':
		case 'a':
		case 'k':
		case 't':
		case 'e':
		case 'p':
			reboot_type = *str;
			break;

		case 'f':
			reboot_force = 1;
			break;
		}

		str = strchr(str, ',');
		if (str)
			str++;
		else
			break;
	}
	return 1;
}
__setup("reboot=", reboot_setup);
Commit	Line	Data
15d94b82 RH	1	/*
	2	* linux/kernel/reboot.c
	3	*
	4	* Copyright (C) 2013 Linus Torvalds
	5	*/
	6
972ee83d RH	7	#define pr_fmt(fmt) "reboot: " fmt
972ee83d RH	8
1b3a5d02	9	#include <linux/ctype.h>
15d94b82 RH	10	#include <linux/export.h>
	11	#include <linux/kexec.h>
	12	#include <linux/kmod.h>
	13	#include <linux/kmsg_dump.h>
	14	#include <linux/reboot.h>
	15	#include <linux/suspend.h>
	16	#include <linux/syscalls.h>
	17	#include <linux/syscore_ops.h>
	18	#include <linux/uaccess.h>
	19
	20	/*
	21	* this indicates whether you can reboot with ctrl-alt-del: the default is yes
	22	*/
	23
	24	int C_A_D = 1;
	25	struct pid *cad_pid;
	26	EXPORT_SYMBOL(cad_pid);
	27
1b3a5d02 RH	28	#if defined(CONFIG_ARM) \|\| defined(CONFIG_UNICORE32)
	29	#define DEFAULT_REBOOT_MODE = REBOOT_HARD
	30	#else
	31	#define DEFAULT_REBOOT_MODE
	32	#endif
	33	enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
	34
	35	int reboot_default;
	36	int reboot_cpu;
	37	enum reboot_type reboot_type = BOOT_ACPI;
	38	int reboot_force;
	39
15d94b82 RH	40	/*
	41	* If set, this is used for preparing the system to power off.
	42	*/
	43
	44	void (*pm_power_off_prepare)(void);
	45
	46	/**
	47	* emergency_restart - reboot the system
	48	*
	49	* Without shutting down any hardware or taking any locks
	50	* reboot the system. This is called when we know we are in
	51	* trouble so this is our best effort to reboot. This is
	52	* safe to call in interrupt context.
	53	*/
	54	void emergency_restart(void)
	55	{
	56	kmsg_dump(KMSG_DUMP_EMERG);
	57	machine_emergency_restart();
	58	}
	59	EXPORT_SYMBOL_GPL(emergency_restart);
	60
	61	void kernel_restart_prepare(char *cmd)
	62	{
	63	blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
	64	system_state = SYSTEM_RESTART;
	65	usermodehelper_disable();
	66	device_shutdown();
	67	}
	68
	69	/**
	70	* register_reboot_notifier - Register function to be called at reboot time
	71	* @nb: Info about notifier function to be called
	72	*
	73	* Registers a function with the list of functions
	74	* to be called at reboot time.
	75	*
	76	* Currently always returns zero, as blocking_notifier_chain_register()
	77	* always returns zero.
	78	*/
	79	int register_reboot_notifier(struct notifier_block *nb)
	80	{
	81	return blocking_notifier_chain_register(&reboot_notifier_list, nb);
	82	}
	83	EXPORT_SYMBOL(register_reboot_notifier);
	84
	85	/**
	86	* unregister_reboot_notifier - Unregister previously registered reboot notifier
	87	* @nb: Hook to be unregistered
	88	*
	89	* Unregisters a previously registered reboot
	90	* notifier function.
	91	*
	92	* Returns zero on success, or %-ENOENT on failure.
	93	*/
	94	int unregister_reboot_notifier(struct notifier_block *nb)
	95	{
	96	return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
	97	}
	98	EXPORT_SYMBOL(unregister_reboot_notifier);
	99
	100	static void migrate_to_reboot_cpu(void)
	101	{
	102	/* The boot cpu is always logical cpu 0 */
1b3a5d02	103	int cpu = reboot_cpu;
15d94b82 RH	104
	105	cpu_hotplug_disable();
	106
	107	/* Make certain the cpu I'm about to reboot on is online */
	108	if (!cpu_online(cpu))
	109	cpu = cpumask_first(cpu_online_mask);
	110
	111	/* Prevent races with other tasks migrating this task */
	112	current->flags \|= PF_NO_SETAFFINITY;
	113
	114	/* Make certain I only run on the appropriate processor */
	115	set_cpus_allowed_ptr(current, cpumask_of(cpu));
	116	}
	117
	118	/**
	119	* kernel_restart - reboot the system
	120	* @cmd: pointer to buffer containing command to execute for restart
	121	* or %NULL
	122	*
	123	* Shutdown everything and perform a clean reboot.
	124	* This is not safe to call in interrupt context.
	125	*/
	126	void kernel_restart(char *cmd)
	127	{
	128	kernel_restart_prepare(cmd);
	129	migrate_to_reboot_cpu();
	130	syscore_shutdown();
	131	if (!cmd)
972ee83d	132	pr_emerg("Restarting system\n");
15d94b82	133	else
972ee83d	134	pr_emerg("Restarting system with command '%s'\n", cmd);
15d94b82 RH	135	kmsg_dump(KMSG_DUMP_RESTART);
	136	machine_restart(cmd);
	137	}
	138	EXPORT_SYMBOL_GPL(kernel_restart);
	139
	140	static void kernel_shutdown_prepare(enum system_states state)
	141	{
	142	blocking_notifier_call_chain(&reboot_notifier_list,
972ee83d	143	(state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
15d94b82 RH	144	system_state = state;
	145	usermodehelper_disable();
	146	device_shutdown();
	147	}
	148	/**
	149	* kernel_halt - halt the system
	150	*
	151	* Shutdown everything and perform a clean system halt.
	152	*/
	153	void kernel_halt(void)
	154	{
	155	kernel_shutdown_prepare(SYSTEM_HALT);
	156	migrate_to_reboot_cpu();
	157	syscore_shutdown();
972ee83d	158	pr_emerg("System halted\n");
15d94b82 RH	159	kmsg_dump(KMSG_DUMP_HALT);
	160	machine_halt();
	161	}
15d94b82 RH	162	EXPORT_SYMBOL_GPL(kernel_halt);
	163
	164	/**
	165	* kernel_power_off - power_off the system
	166	*
	167	* Shutdown everything and perform a clean system power_off.
	168	*/
	169	void kernel_power_off(void)
	170	{
	171	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
	172	if (pm_power_off_prepare)
	173	pm_power_off_prepare();
	174	migrate_to_reboot_cpu();
	175	syscore_shutdown();
972ee83d	176	pr_emerg("Power down\n");
15d94b82 RH	177	kmsg_dump(KMSG_DUMP_POWEROFF);
	178	machine_power_off();
	179	}
	180	EXPORT_SYMBOL_GPL(kernel_power_off);
	181
	182	static DEFINE_MUTEX(reboot_mutex);
	183
	184	/*
	185	* Reboot system call: for obvious reasons only root may call it,
	186	* and even root needs to set up some magic numbers in the registers
	187	* so that some mistake won't make this reboot the whole machine.
	188	* You can also set the meaning of the ctrl-alt-del-key here.
	189	*
	190	* reboot doesn't sync: do that yourself before calling this.
	191	*/
	192	SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
	193	void __user *, arg)
	194	{
	195	struct pid_namespace *pid_ns = task_active_pid_ns(current);
	196	char buffer[256];
	197	int ret = 0;
	198
	199	/* We only trust the superuser with rebooting the system. */
	200	if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
	201	return -EPERM;
	202
	203	/* For safety, we require "magic" arguments. */
	204	if (magic1 != LINUX_REBOOT_MAGIC1 \|\|
972ee83d RH	205	(magic2 != LINUX_REBOOT_MAGIC2 &&
972ee83d RH	206	magic2 != LINUX_REBOOT_MAGIC2A &&
15d94b82	207	magic2 != LINUX_REBOOT_MAGIC2B &&
972ee83d	208	magic2 != LINUX_REBOOT_MAGIC2C))
15d94b82 RH	209	return -EINVAL;
	210
	211	/*
	212	* If pid namespaces are enabled and the current task is in a child
	213	* pid_namespace, the command is handled by reboot_pid_ns() which will
	214	* call do_exit().
	215	*/
	216	ret = reboot_pid_ns(pid_ns, cmd);
	217	if (ret)
	218	return ret;
	219
	220	/* Instead of trying to make the power_off code look like
	221	* halt when pm_power_off is not set do it the easy way.
	222	*/
	223	if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
	224	cmd = LINUX_REBOOT_CMD_HALT;
	225
	226	mutex_lock(&reboot_mutex);
	227	switch (cmd) {
	228	case LINUX_REBOOT_CMD_RESTART:
	229	kernel_restart(NULL);
	230	break;
	231
	232	case LINUX_REBOOT_CMD_CAD_ON:
	233	C_A_D = 1;
	234	break;
	235
	236	case LINUX_REBOOT_CMD_CAD_OFF:
	237	C_A_D = 0;
	238	break;
	239
	240	case LINUX_REBOOT_CMD_HALT:
	241	kernel_halt();
	242	do_exit(0);
	243	panic("cannot halt");
	244
	245	case LINUX_REBOOT_CMD_POWER_OFF:
	246	kernel_power_off();
	247	do_exit(0);
	248	break;
	249
	250	case LINUX_REBOOT_CMD_RESTART2:
972ee83d RH	251	ret = strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1);
972ee83d RH	252	if (ret < 0) {
15d94b82 RH	253	ret = -EFAULT;
	254	break;
	255	}
	256	buffer[sizeof(buffer) - 1] = '\0';
	257
	258	kernel_restart(buffer);
	259	break;
	260
	261	#ifdef CONFIG_KEXEC
	262	case LINUX_REBOOT_CMD_KEXEC:
	263	ret = kernel_kexec();
	264	break;
	265	#endif
	266
	267	#ifdef CONFIG_HIBERNATION
	268	case LINUX_REBOOT_CMD_SW_SUSPEND:
	269	ret = hibernate();
	270	break;
	271	#endif
	272
	273	default:
	274	ret = -EINVAL;
	275	break;
	276	}
	277	mutex_unlock(&reboot_mutex);
	278	return ret;
	279	}
	280
	281	static void deferred_cad(struct work_struct *dummy)
	282	{
	283	kernel_restart(NULL);
	284	}
	285
	286	/*
	287	* This function gets called by ctrl-alt-del - ie the keyboard interrupt.
	288	* As it's called within an interrupt, it may NOT sync: the only choice
	289	* is whether to reboot at once, or just ignore the ctrl-alt-del.
	290	*/
	291	void ctrl_alt_del(void)
	292	{
	293	static DECLARE_WORK(cad_work, deferred_cad);
	294
	295	if (C_A_D)
	296	schedule_work(&cad_work);
	297	else
	298	kill_cad_pid(SIGINT, 1);
	299	}
	300
	301	char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
	302
	303	static int __orderly_poweroff(bool force)
	304	{
	305	char **argv;
	306	static char *envp[] = {
	307	"HOME=/",
	308	"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
	309	NULL
	310	};
	311	int ret;
	312
	313	argv = argv_split(GFP_KERNEL, poweroff_cmd, NULL);
	314	if (argv) {
	315	ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
	316	argv_free(argv);
317	} else {
15d94b82 RH	318	ret = -ENOMEM;
	319	}
	320
	321	if (ret && force) {
972ee83d	322	pr_warn("Failed to start orderly shutdown: forcing the issue\n");
15d94b82 RH	323	/*
	324	* I guess this should try to kick off some daemon to sync and
	325	* poweroff asap. Or not even bother syncing if we're doing an
	326	* emergency shutdown?
	327	*/
	328	emergency_sync();
	329	kernel_power_off();
	330	}
	331
	332	return ret;
	333	}
	334
	335	static bool poweroff_force;
	336
	337	static void poweroff_work_func(struct work_struct *work)
	338	{
	339	__orderly_poweroff(poweroff_force);
	340	}
	341
	342	static DECLARE_WORK(poweroff_work, poweroff_work_func);
	343
	344	/**
	345	* orderly_poweroff - Trigger an orderly system poweroff
	346	* @force: force poweroff if command execution fails
	347	*
	348	* This may be called from any context to trigger a system shutdown.
	349	* If the orderly shutdown fails, it will force an immediate shutdown.
	350	*/
	351	int orderly_poweroff(bool force)
	352	{
	353	if (force) /* do not override the pending "true" */
	354	poweroff_force = true;
	355	schedule_work(&poweroff_work);
	356	return 0;
	357	}
	358	EXPORT_SYMBOL_GPL(orderly_poweroff);
1b3a5d02 RH	359
	360	static int __init reboot_setup(char *str)
	361	{
	362	for (;;) {
	363	/*
	364	* Having anything passed on the command line via
	365	* reboot= will cause us to disable DMI checking
	366	* below.
	367	*/
	368	reboot_default = 0;
	369
	370	switch (*str) {
	371	case 'w':
	372	reboot_mode = REBOOT_WARM;
	373	break;
	374
	375	case 'c':
	376	reboot_mode = REBOOT_COLD;
	377	break;
	378
	379	case 'h':
	380	reboot_mode = REBOOT_HARD;
	381	break;
	382
	383	case 's':
	384	if (isdigit(*(str+1)))
	385	reboot_cpu = simple_strtoul(str+1, NULL, 0);
	386	else if (str[1] == 'm' && str[2] == 'p' &&
	387	isdigit(*(str+3)))
	388	reboot_cpu = simple_strtoul(str+3, NULL, 0);
	389	else
	390	reboot_mode = REBOOT_SOFT;
	391	break;
	392
	393	case 'g':
	394	reboot_mode = REBOOT_GPIO;
	395	break;
	396
	397	case 'b':
	398	case 'a':
	399	case 'k':
	400	case 't':
	401	case 'e':
	402	case 'p':
	403	reboot_type = *str;
	404	break;
	405
	406	case 'f':
	407	reboot_force = 1;
	408	break;
	409	}
	410
	411	str = strchr(str, ',');
	412	if (str)
	413	str++;
	414	else
	415	break;
	416	}
	417	return 1;
	418	}
	419	__setup("reboot=", reboot_setup);