[net-next-2.6.git] / kernel / power / disk.c

/*
 * kernel/power/disk.c - Suspend-to-disk support.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
 *
 * This file is released under the GPLv2.
 *
 */

#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pm.h>

#include "power.h"


extern suspend_disk_method_t pm_disk_mode;

extern int swsusp_suspend(void);
extern int swsusp_write(void);
extern int swsusp_check(void);
extern int swsusp_read(void);
extern void swsusp_close(void);
extern int swsusp_resume(void);
extern int swsusp_free(void);


static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;

/**
 *	power_down - Shut machine down for hibernate.
 *	@mode:		Suspend-to-disk mode
 *
 *	Use the platform driver, if configured so, and return gracefully if it
 *	fails.
 *	Otherwise, try to power off and reboot. If they fail, halt the machine,
 *	there ain't no turning back.
 */

static void power_down(suspend_disk_method_t mode)
{
	int error = 0;

	switch(mode) {
	case PM_DISK_PLATFORM:
		kernel_power_off_prepare();
		error = pm_ops->enter(PM_SUSPEND_DISK);
		break;
	case PM_DISK_SHUTDOWN:
		kernel_power_off();
		break;
	case PM_DISK_REBOOT:
		kernel_restart(NULL);
		break;
	}
	kernel_halt();
	/* Valid image is on the disk, if we continue we risk serious data corruption
	   after resume. */
	printk(KERN_CRIT "Please power me down manually\n");
	while(1);
}


static int in_suspend __nosavedata = 0;


/**
 *	free_some_memory -  Try to free as much memory as possible
 *
 *	... but do not OOM-kill anyone
 *
 *	Notice: all userland should be stopped at this point, or
 *	livelock is possible.
 */

static void free_some_memory(void)
{
	unsigned int i = 0;
	unsigned int tmp;
	unsigned long pages = 0;
	char *p = "-\\|/";

	printk("Freeing memory...  ");
	while ((tmp = shrink_all_memory(10000))) {
		pages += tmp;
		printk("\b%c", p[i]);
		i++;
		if (i > 3)
			i = 0;
	}
	printk("\bdone (%li pages freed)\n", pages);
}


static inline void platform_finish(void)
{
	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->finish)
			pm_ops->finish(PM_SUSPEND_DISK);
	}
}

static int prepare_processes(void)
{
	int error;

	pm_prepare_console();
	sys_sync();
	disable_nonboot_cpus();

	if (freeze_processes()) {
		error = -EBUSY;
		goto thaw;
	}

	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->prepare) {
			if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
				goto thaw;
		}
	}

	/* Free memory before shutting down devices. */
	free_some_memory();
	return 0;
thaw:
	thaw_processes();
	enable_nonboot_cpus();
	pm_restore_console();
	return error;
}

static void unprepare_processes(void)
{
	platform_finish();
	thaw_processes();
	enable_nonboot_cpus();
	pm_restore_console();
}

/**
 *	pm_suspend_disk - The granpappy of power management.
 *
 *	If we're going through the firmware, then get it over with quickly.
 *
 *	If not, then call swsusp to do its thing, then figure out how
 *	to power down the system.
 */

int pm_suspend_disk(void)
{
	int error;

	error = prepare_processes();
	if (error)
		return error;

	error = device_suspend(PMSG_FREEZE);
	if (error) {
		printk("Some devices failed to suspend\n");
		unprepare_processes();
		return error;
	}

	pr_debug("PM: snapshotting memory.\n");
	in_suspend = 1;
	if ((error = swsusp_suspend()))
		goto Done;

	if (in_suspend) {
		pr_debug("PM: writing image.\n");
		error = swsusp_write();
		if (!error)
			power_down(pm_disk_mode);
		else {
		/* swsusp_write can not fail in device_resume,
		   no need to do second device_resume */
			swsusp_free();
			unprepare_processes();
			return error;
		}
	} else
		pr_debug("PM: Image restored successfully.\n");

	swsusp_free();
 Done:
	device_resume();
	unprepare_processes();
	return error;
}


/**
 *	software_resume - Resume from a saved image.
 *
 *	Called as a late_initcall (so all devices are discovered and
 *	initialized), we call swsusp to see if we have a saved image or not.
 *	If so, we quiesce devices, the restore the saved image. We will
 *	return above (in pm_suspend_disk() ) if everything goes well.
 *	Otherwise, we fail gracefully and return to the normally
 *	scheduled program.
 *
 */

static int software_resume(void)
{
	int error;

	down(&pm_sem);
	if (!swsusp_resume_device) {
		if (!strlen(resume_file)) {
			up(&pm_sem);
			return -ENOENT;
		}
		swsusp_resume_device = name_to_dev_t(resume_file);
		pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	} else {
		pr_debug("swsusp: Resume From Partition %d:%d\n",
			 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	}

	if (noresume) {
		/**
		 * FIXME: If noresume is specified, we need to find the partition
		 * and reset it back to normal swap space.
		 */
		up(&pm_sem);
		return 0;
	}

	pr_debug("PM: Checking swsusp image.\n");

	if ((error = swsusp_check()))
		goto Done;

	pr_debug("PM: Preparing processes for restore.\n");

	if ((error = prepare_processes())) {
		swsusp_close();
		goto Done;
	}

	pr_debug("PM: Reading swsusp image.\n");

	if ((error = swsusp_read()))
		goto Cleanup;

	pr_debug("PM: Preparing devices for restore.\n");

	if ((error = device_suspend(PMSG_FREEZE))) {
		printk("Some devices failed to suspend\n");
		goto Free;
	}

	mb();

	pr_debug("PM: Restoring saved image.\n");
	swsusp_resume();
	pr_debug("PM: Restore failed, recovering.n");
	device_resume();
 Free:
	swsusp_free();
 Cleanup:
	unprepare_processes();
 Done:
	/* For success case, the suspend path will release the lock */
	up(&pm_sem);
	pr_debug("PM: Resume from disk failed.\n");
	return 0;
}

late_initcall(software_resume);


static char * pm_disk_modes[] = {
	[PM_DISK_FIRMWARE]	= "firmware",
	[PM_DISK_PLATFORM]	= "platform",
	[PM_DISK_SHUTDOWN]	= "shutdown",
	[PM_DISK_REBOOT]	= "reboot",
};

/**
 *	disk - Control suspend-to-disk mode
 *
 *	Suspend-to-disk can be handled in several ways. The greatest
 *	distinction is who writes memory to disk - the firmware or the OS.
 *	If the firmware does it, we assume that it also handles suspending
 *	the system.
 *	If the OS does it, then we have three options for putting the system
 *	to sleep - using the platform driver (e.g. ACPI or other PM registers),
 *	powering off the system or rebooting the system (for testing).
 *
 *	The system will support either 'firmware' or 'platform', and that is
 *	known a priori (and encoded in pm_ops). But, the user may choose
 *	'shutdown' or 'reboot' as alternatives.
 *
 *	show() will display what the mode is currently set to.
 *	store() will accept one of
 *
 *	'firmware'
 *	'platform'
 *	'shutdown'
 *	'reboot'
 *
 *	It will only change to 'firmware' or 'platform' if the system
 *	supports it (as determined from pm_ops->pm_disk_mode).
 */

static ssize_t disk_show(struct subsystem * subsys, char * buf)
{
	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}


static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
{
	int error = 0;
	int i;
	int len;
	char *p;
	suspend_disk_method_t mode = 0;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	down(&pm_sem);
	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
		if (!strncmp(buf, pm_disk_modes[i], len)) {
			mode = i;
			break;
		}
	}
	if (mode) {
		if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
			pm_disk_mode = mode;
		else {
			if (pm_ops && pm_ops->enter &&
			    (mode == pm_ops->pm_disk_mode))
				pm_disk_mode = mode;
			else
				error = -EINVAL;
		}
	} else
		error = -EINVAL;

	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
		 pm_disk_modes[mode]);
	up(&pm_sem);
	return error ? error : n;
}

power_attr(disk);

static ssize_t resume_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
		       MINOR(swsusp_resume_device));
}

static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t n)
{
	int len;
	char *p;
	unsigned int maj, min;
	int error = -EINVAL;
	dev_t res;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
		res = MKDEV(maj,min);
		if (maj == MAJOR(res) && min == MINOR(res)) {
			down(&pm_sem);
			swsusp_resume_device = res;
			up(&pm_sem);
			printk("Attempting manual resume\n");
			noresume = 0;
			software_resume();
		}
	}

	return error >= 0 ? n : error;
}

power_attr(resume);

static struct attribute * g[] = {
	&disk_attr.attr,
	&resume_attr.attr,
	NULL,
};


static struct attribute_group attr_group = {
	.attrs = g,
};


static int __init pm_disk_init(void)
{
	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
}

core_initcall(pm_disk_init);


static int __init resume_setup(char *str)
{
	if (noresume)
		return 1;

	strncpy( resume_file, str, 255 );
	return 1;
}

static int __init noresume_setup(char *str)
{
	noresume = 1;
	return 1;
}

__setup("noresume", noresume_setup);
__setup("resume=", resume_setup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/power/disk.c - Suspend-to-disk support.
	3	*
	4	* Copyright (c) 2003 Patrick Mochel
	5	* Copyright (c) 2003 Open Source Development Lab
	6	* Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
	7	*
	8	* This file is released under the GPLv2.
	9	*
	10	*/
	11
	12	#include <linux/suspend.h>
	13	#include <linux/syscalls.h>
	14	#include <linux/reboot.h>
	15	#include <linux/string.h>
	16	#include <linux/device.h>
	17	#include <linux/delay.h>
	18	#include <linux/fs.h>
d53d9f16	19	#include <linux/mount.h>
88d10bba	20	#include <linux/pm.h>
d53d9f16	21
1da177e4 LT	22	#include "power.h"
	23
	24
	25	extern suspend_disk_method_t pm_disk_mode;
1da177e4 LT	26
	27	extern int swsusp_suspend(void);
	28	extern int swsusp_write(void);
	29	extern int swsusp_check(void);
	30	extern int swsusp_read(void);
	31	extern void swsusp_close(void);
	32	extern int swsusp_resume(void);
	33	extern int swsusp_free(void);
	34
	35
	36	static int noresume = 0;
	37	char resume_file[256] = CONFIG_PM_STD_PARTITION;
	38	dev_t swsusp_resume_device;
	39
	40	/**
	41	* power_down - Shut machine down for hibernate.
	42	* @mode: Suspend-to-disk mode
	43	*
	44	* Use the platform driver, if configured so, and return gracefully if it
	45	* fails.
	46	* Otherwise, try to power off and reboot. If they fail, halt the machine,
	47	* there ain't no turning back.
	48	*/
	49
	50	static void power_down(suspend_disk_method_t mode)
	51	{
1da177e4 LT	52	int error = 0;
1da177e4 LT	53
1da177e4 LT	54	switch(mode) {
1da177e4 LT	55	case PM_DISK_PLATFORM:
88d10bba	56	kernel_power_off_prepare();
1da177e4 LT	57	error = pm_ops->enter(PM_SUSPEND_DISK);
	58	break;
	59	case PM_DISK_SHUTDOWN:
fdde86ac	60	kernel_power_off();
1da177e4 LT	61	break;
1da177e4 LT	62	case PM_DISK_REBOOT:
fdde86ac	63	kernel_restart(NULL);
1da177e4 LT	64	break;
1da177e4 LT	65	}
fdde86ac	66	kernel_halt();
1da177e4 LT	67	/* Valid image is on the disk, if we continue we risk serious data corruption
	68	after resume. */
	69	printk(KERN_CRIT "Please power me down manually\n");
	70	while(1);
	71	}
	72
	73
	74	static int in_suspend __nosavedata = 0;
	75
	76
	77	/**
	78	* free_some_memory - Try to free as much memory as possible
	79	*
	80	* ... but do not OOM-kill anyone
	81	*
	82	* Notice: all userland should be stopped at this point, or
	83	* livelock is possible.
	84	*/
	85
	86	static void free_some_memory(void)
	87	{
	88	unsigned int i = 0;
	89	unsigned int tmp;
	90	unsigned long pages = 0;
	91	char *p = "-\\\|/";
	92
	93	printk("Freeing memory... ");
	94	while ((tmp = shrink_all_memory(10000))) {
	95	pages += tmp;
	96	printk("\b%c", p[i]);
	97	i++;
	98	if (i > 3)
	99	i = 0;
	100	}
	101	printk("\bdone (%li pages freed)\n", pages);
	102	}
	103
	104
	105	static inline void platform_finish(void)
	106	{
	107	if (pm_disk_mode == PM_DISK_PLATFORM) {
	108	if (pm_ops && pm_ops->finish)
	109	pm_ops->finish(PM_SUSPEND_DISK);
	110	}
	111	}
	112
1da177e4 LT	113	static int prepare_processes(void)
	114	{
	115	int error;
	116
	117	pm_prepare_console();
1da177e4	118	sys_sync();
5a72e04d LS	119	disable_nonboot_cpus();
5a72e04d LS	120
1da177e4 LT	121	if (freeze_processes()) {
1da177e4 LT	122	error = -EBUSY;
5a72e04d	123	goto thaw;
1da177e4 LT	124	}
	125
	126	if (pm_disk_mode == PM_DISK_PLATFORM) {
	127	if (pm_ops && pm_ops->prepare) {
	128	if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
5a72e04d	129	goto thaw;
1da177e4 LT	130	}
	131	}
	132
	133	/* Free memory before shutting down devices. */
	134	free_some_memory();
1da177e4	135	return 0;
5a72e04d LS	136	thaw:
	137	thaw_processes();
	138	enable_nonboot_cpus();
	139	pm_restore_console();
	140	return error;
1da177e4 LT	141	}
	142
	143	static void unprepare_processes(void)
	144	{
5a72e04d	145	platform_finish();
1da177e4	146	thaw_processes();
5a72e04d	147	enable_nonboot_cpus();
1da177e4 LT	148	pm_restore_console();
	149	}
	150
1da177e4 LT	151	/**
	152	* pm_suspend_disk - The granpappy of power management.
	153	*
	154	* If we're going through the firmware, then get it over with quickly.
	155	*
	156	* If not, then call swsusp to do its thing, then figure out how
	157	* to power down the system.
	158	*/
	159
	160	int pm_suspend_disk(void)
	161	{
	162	int error;
	163
	164	error = prepare_processes();
5a72e04d LS	165	if (error)
5a72e04d LS	166	return error;
1da177e4	167
99dc7d63	168	error = device_suspend(PMSG_FREEZE);
1da177e4	169	if (error) {
99dc7d63	170	printk("Some devices failed to suspend\n");
1da177e4 LT	171	unprepare_processes();
	172	return error;
	173	}
	174
1da177e4 LT	175	pr_debug("PM: snapshotting memory.\n");
	176	in_suspend = 1;
	177	if ((error = swsusp_suspend()))
	178	goto Done;
	179
	180	if (in_suspend) {
	181	pr_debug("PM: writing image.\n");
	182	error = swsusp_write();
	183	if (!error)
	184	power_down(pm_disk_mode);
99dc7d63 PM	185	else {
	186	/* swsusp_write can not fail in device_resume,
	187	no need to do second device_resume */
	188	swsusp_free();
	189	unprepare_processes();
	190	return error;
	191	}
1da177e4 LT	192	} else
1da177e4 LT	193	pr_debug("PM: Image restored successfully.\n");
99dc7d63	194
1da177e4 LT	195	swsusp_free();
1da177e4 LT	196	Done:
99dc7d63 PM	197	device_resume();
99dc7d63 PM	198	unprepare_processes();
1da177e4 LT	199	return error;
	200	}
	201
	202
	203	/**
	204	* software_resume - Resume from a saved image.
	205	*
	206	* Called as a late_initcall (so all devices are discovered and
	207	* initialized), we call swsusp to see if we have a saved image or not.
	208	* If so, we quiesce devices, the restore the saved image. We will
	209	* return above (in pm_suspend_disk() ) if everything goes well.
	210	* Otherwise, we fail gracefully and return to the normally
	211	* scheduled program.
	212	*
	213	*/
	214
	215	static int software_resume(void)
	216	{
	217	int error;
	218
dd5d666b	219	down(&pm_sem);
3efa147a	220	if (!swsusp_resume_device) {
dd5d666b SL	221	if (!strlen(resume_file)) {
dd5d666b SL	222	up(&pm_sem);
3efa147a	223	return -ENOENT;
dd5d666b	224	}
3efa147a PM	225	swsusp_resume_device = name_to_dev_t(resume_file);
	226	pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	227	} else {
	228	pr_debug("swsusp: Resume From Partition %d:%d\n",
	229	MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	230	}
	231
1da177e4 LT	232	if (noresume) {
	233	/**
	234	* FIXME: If noresume is specified, we need to find the partition
	235	* and reset it back to normal swap space.
	236	*/
dd5d666b	237	up(&pm_sem);
1da177e4 LT	238	return 0;
	239	}
	240
	241	pr_debug("PM: Checking swsusp image.\n");
	242
	243	if ((error = swsusp_check()))
	244	goto Done;
	245
	246	pr_debug("PM: Preparing processes for restore.\n");
	247
	248	if ((error = prepare_processes())) {
	249	swsusp_close();
5a72e04d	250	goto Done;
1da177e4 LT	251	}
	252
	253	pr_debug("PM: Reading swsusp image.\n");
	254
	255	if ((error = swsusp_read()))
	256	goto Cleanup;
	257
	258	pr_debug("PM: Preparing devices for restore.\n");
	259
99dc7d63 PM	260	if ((error = device_suspend(PMSG_FREEZE))) {
99dc7d63 PM	261	printk("Some devices failed to suspend\n");
1da177e4	262	goto Free;
99dc7d63	263	}
1da177e4 LT	264
	265	mb();
	266
	267	pr_debug("PM: Restoring saved image.\n");
	268	swsusp_resume();
	269	pr_debug("PM: Restore failed, recovering.n");
99dc7d63	270	device_resume();
1da177e4 LT	271	Free:
	272	swsusp_free();
	273	Cleanup:
	274	unprepare_processes();
	275	Done:
dd5d666b SL	276	/* For success case, the suspend path will release the lock */
dd5d666b SL	277	up(&pm_sem);
1da177e4 LT	278	pr_debug("PM: Resume from disk failed.\n");
	279	return 0;
	280	}
	281
	282	late_initcall(software_resume);
	283
	284
	285	static char * pm_disk_modes[] = {
	286	[PM_DISK_FIRMWARE] = "firmware",
	287	[PM_DISK_PLATFORM] = "platform",
	288	[PM_DISK_SHUTDOWN] = "shutdown",
	289	[PM_DISK_REBOOT] = "reboot",
	290	};
	291
	292	/**
	293	* disk - Control suspend-to-disk mode
	294	*
	295	* Suspend-to-disk can be handled in several ways. The greatest
	296	* distinction is who writes memory to disk - the firmware or the OS.
	297	* If the firmware does it, we assume that it also handles suspending
	298	* the system.
	299	* If the OS does it, then we have three options for putting the system
	300	* to sleep - using the platform driver (e.g. ACPI or other PM registers),
	301	* powering off the system or rebooting the system (for testing).
	302	*
	303	* The system will support either 'firmware' or 'platform', and that is
	304	* known a priori (and encoded in pm_ops). But, the user may choose
	305	* 'shutdown' or 'reboot' as alternatives.
	306	*
	307	* show() will display what the mode is currently set to.
	308	* store() will accept one of
	309	*
	310	* 'firmware'
	311	* 'platform'
	312	* 'shutdown'
	313	* 'reboot'
	314	*
	315	* It will only change to 'firmware' or 'platform' if the system
	316	* supports it (as determined from pm_ops->pm_disk_mode).
	317	*/
	318
	319	static ssize_t disk_show(struct subsystem * subsys, char * buf)
	320	{
	321	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
	322	}
	323
	324
	325	static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
	326	{
	327	int error = 0;
	328	int i;
	329	int len;
	330	char *p;
	331	suspend_disk_method_t mode = 0;
	332
	333	p = memchr(buf, '\n', n);
	334	len = p ? p - buf : n;
	335
	336	down(&pm_sem);
	337	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
	338	if (!strncmp(buf, pm_disk_modes[i], len)) {
	339	mode = i;
	340	break;
	341	}
342	}
343	if (mode) {
344	if (mode == PM_DISK_SHUTDOWN \|\| mode == PM_DISK_REBOOT)
345	pm_disk_mode = mode;
346	else {
347	if (pm_ops && pm_ops->enter &&
348	(mode == pm_ops->pm_disk_mode))
349	pm_disk_mode = mode;
350	else
351	error = -EINVAL;
352	}
353	} else
354	error = -EINVAL;
355
356	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
357	pm_disk_modes[mode]);
358	up(&pm_sem);
359	return error ? error : n;
360	}
361
362	power_attr(disk);
363
364	static ssize_t resume_show(struct subsystem * subsys, char *buf)
365	{
366	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
367	MINOR(swsusp_resume_device));
368	}
369
370	static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t n)
371	{
372	int len;
373	char *p;
374	unsigned int maj, min;
375	int error = -EINVAL;
376	dev_t res;
377
378	p = memchr(buf, '\n', n);
379	len = p ? p - buf : n;
380
381	if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
382	res = MKDEV(maj,min);
383	if (maj == MAJOR(res) && min == MINOR(res)) {
dd5d666b	384	down(&pm_sem);
1da177e4	385	swsusp_resume_device = res;
dd5d666b	386	up(&pm_sem);
1da177e4 LT	387	printk("Attempting manual resume\n");
	388	noresume = 0;
	389	software_resume();
	390	}
	391	}
	392
	393	return error >= 0 ? n : error;
	394	}
	395
	396	power_attr(resume);
	397
	398	static struct attribute * g[] = {
	399	&disk_attr.attr,
	400	&resume_attr.attr,
	401	NULL,
	402	};
	403
	404
	405	static struct attribute_group attr_group = {
	406	.attrs = g,
	407	};
	408
	409
	410	static int __init pm_disk_init(void)
	411	{
	412	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
	413	}
	414
	415	core_initcall(pm_disk_init);
	416
	417
	418	static int __init resume_setup(char *str)
	419	{
	420	if (noresume)
	421	return 1;
	422
	423	strncpy( resume_file, str, 255 );
	424	return 1;
	425	}
	426
	427	static int __init noresume_setup(char *str)
	428	{
	429	noresume = 1;
	430	return 1;
	431	}
	432
	433	__setup("noresume", noresume_setup);
	434	__setup("resume=", resume_setup);