Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef _LINUX_SUSPEND_H
3 : #define _LINUX_SUSPEND_H
4 :
5 : #include <linux/swap.h>
6 : #include <linux/notifier.h>
7 : #include <linux/init.h>
8 : #include <linux/pm.h>
9 : #include <linux/mm.h>
10 : #include <linux/freezer.h>
11 : #include <asm/errno.h>
12 :
13 : #ifdef CONFIG_VT
14 : extern void pm_set_vt_switch(int);
15 : #else
16 : static inline void pm_set_vt_switch(int do_switch)
17 : {
18 : }
19 : #endif
20 :
21 : #ifdef CONFIG_VT_CONSOLE_SLEEP
22 : extern void pm_prepare_console(void);
23 : extern void pm_restore_console(void);
24 : #else
25 : static inline void pm_prepare_console(void)
26 : {
27 : }
28 :
29 : static inline void pm_restore_console(void)
30 : {
31 : }
32 : #endif
33 :
34 : typedef int __bitwise suspend_state_t;
35 :
36 : #define PM_SUSPEND_ON ((__force suspend_state_t) 0)
37 : #define PM_SUSPEND_TO_IDLE ((__force suspend_state_t) 1)
38 : #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2)
39 : #define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
40 : #define PM_SUSPEND_MIN PM_SUSPEND_TO_IDLE
41 : #define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
42 :
43 : enum suspend_stat_step {
44 : SUSPEND_FREEZE = 1,
45 : SUSPEND_PREPARE,
46 : SUSPEND_SUSPEND,
47 : SUSPEND_SUSPEND_LATE,
48 : SUSPEND_SUSPEND_NOIRQ,
49 : SUSPEND_RESUME_NOIRQ,
50 : SUSPEND_RESUME_EARLY,
51 : SUSPEND_RESUME
52 : };
53 :
54 : struct suspend_stats {
55 : int success;
56 : int fail;
57 : int failed_freeze;
58 : int failed_prepare;
59 : int failed_suspend;
60 : int failed_suspend_late;
61 : int failed_suspend_noirq;
62 : int failed_resume;
63 : int failed_resume_early;
64 : int failed_resume_noirq;
65 : #define REC_FAILED_NUM 2
66 : int last_failed_dev;
67 : char failed_devs[REC_FAILED_NUM][40];
68 : int last_failed_errno;
69 : int errno[REC_FAILED_NUM];
70 : int last_failed_step;
71 : enum suspend_stat_step failed_steps[REC_FAILED_NUM];
72 : };
73 :
74 : extern struct suspend_stats suspend_stats;
75 :
76 : static inline void dpm_save_failed_dev(const char *name)
77 : {
78 0 : strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
79 : name,
80 : sizeof(suspend_stats.failed_devs[0]));
81 0 : suspend_stats.last_failed_dev++;
82 0 : suspend_stats.last_failed_dev %= REC_FAILED_NUM;
83 : }
84 :
85 : static inline void dpm_save_failed_errno(int err)
86 : {
87 0 : suspend_stats.errno[suspend_stats.last_failed_errno] = err;
88 0 : suspend_stats.last_failed_errno++;
89 0 : suspend_stats.last_failed_errno %= REC_FAILED_NUM;
90 : }
91 :
92 : static inline void dpm_save_failed_step(enum suspend_stat_step step)
93 : {
94 0 : suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
95 0 : suspend_stats.last_failed_step++;
96 0 : suspend_stats.last_failed_step %= REC_FAILED_NUM;
97 : }
98 :
99 : /**
100 : * struct platform_suspend_ops - Callbacks for managing platform dependent
101 : * system sleep states.
102 : *
103 : * @valid: Callback to determine if given system sleep state is supported by
104 : * the platform.
105 : * Valid (ie. supported) states are advertised in /sys/power/state. Note
106 : * that it still may be impossible to enter given system sleep state if the
107 : * conditions aren't right.
108 : * There is the %suspend_valid_only_mem function available that can be
109 : * assigned to this if the platform only supports mem sleep.
110 : *
111 : * @begin: Initialise a transition to given system sleep state.
112 : * @begin() is executed right prior to suspending devices. The information
113 : * conveyed to the platform code by @begin() should be disregarded by it as
114 : * soon as @end() is executed. If @begin() fails (ie. returns nonzero),
115 : * @prepare(), @enter() and @finish() will not be called by the PM core.
116 : * This callback is optional. However, if it is implemented, the argument
117 : * passed to @enter() is redundant and should be ignored.
118 : *
119 : * @prepare: Prepare the platform for entering the system sleep state indicated
120 : * by @begin().
121 : * @prepare() is called right after devices have been suspended (ie. the
122 : * appropriate .suspend() method has been executed for each device) and
123 : * before device drivers' late suspend callbacks are executed. It returns
124 : * 0 on success or a negative error code otherwise, in which case the
125 : * system cannot enter the desired sleep state (@prepare_late(), @enter(),
126 : * and @wake() will not be called in that case).
127 : *
128 : * @prepare_late: Finish preparing the platform for entering the system sleep
129 : * state indicated by @begin().
130 : * @prepare_late is called before disabling nonboot CPUs and after
131 : * device drivers' late suspend callbacks have been executed. It returns
132 : * 0 on success or a negative error code otherwise, in which case the
133 : * system cannot enter the desired sleep state (@enter() will not be
134 : * executed).
135 : *
136 : * @enter: Enter the system sleep state indicated by @begin() or represented by
137 : * the argument if @begin() is not implemented.
138 : * This callback is mandatory. It returns 0 on success or a negative
139 : * error code otherwise, in which case the system cannot enter the desired
140 : * sleep state.
141 : *
142 : * @wake: Called when the system has just left a sleep state, right after
143 : * the nonboot CPUs have been enabled and before device drivers' early
144 : * resume callbacks are executed.
145 : * This callback is optional, but should be implemented by the platforms
146 : * that implement @prepare_late(). If implemented, it is always called
147 : * after @prepare_late and @enter(), even if one of them fails.
148 : *
149 : * @finish: Finish wake-up of the platform.
150 : * @finish is called right prior to calling device drivers' regular suspend
151 : * callbacks.
152 : * This callback is optional, but should be implemented by the platforms
153 : * that implement @prepare(). If implemented, it is always called after
154 : * @enter() and @wake(), even if any of them fails. It is executed after
155 : * a failing @prepare.
156 : *
157 : * @suspend_again: Returns whether the system should suspend again (true) or
158 : * not (false). If the platform wants to poll sensors or execute some
159 : * code during suspended without invoking userspace and most of devices,
160 : * suspend_again callback is the place assuming that periodic-wakeup or
161 : * alarm-wakeup is already setup. This allows to execute some codes while
162 : * being kept suspended in the view of userland and devices.
163 : *
164 : * @end: Called by the PM core right after resuming devices, to indicate to
165 : * the platform that the system has returned to the working state or
166 : * the transition to the sleep state has been aborted.
167 : * This callback is optional, but should be implemented by the platforms
168 : * that implement @begin(). Accordingly, platforms implementing @begin()
169 : * should also provide a @end() which cleans up transitions aborted before
170 : * @enter().
171 : *
172 : * @recover: Recover the platform from a suspend failure.
173 : * Called by the PM core if the suspending of devices fails.
174 : * This callback is optional and should only be implemented by platforms
175 : * which require special recovery actions in that situation.
176 : */
177 : struct platform_suspend_ops {
178 : int (*valid)(suspend_state_t state);
179 : int (*begin)(suspend_state_t state);
180 : int (*prepare)(void);
181 : int (*prepare_late)(void);
182 : int (*enter)(suspend_state_t state);
183 : void (*wake)(void);
184 : void (*finish)(void);
185 : bool (*suspend_again)(void);
186 : void (*end)(void);
187 : void (*recover)(void);
188 : };
189 :
190 : struct platform_s2idle_ops {
191 : int (*begin)(void);
192 : int (*prepare)(void);
193 : int (*prepare_late)(void);
194 : bool (*wake)(void);
195 : void (*restore_early)(void);
196 : void (*restore)(void);
197 : void (*end)(void);
198 : };
199 :
200 : #ifdef CONFIG_SUSPEND
201 : extern suspend_state_t mem_sleep_current;
202 : extern suspend_state_t mem_sleep_default;
203 :
204 : /**
205 : * suspend_set_ops - set platform dependent suspend operations
206 : * @ops: The new suspend operations to set.
207 : */
208 : extern void suspend_set_ops(const struct platform_suspend_ops *ops);
209 : extern int suspend_valid_only_mem(suspend_state_t state);
210 :
211 : extern unsigned int pm_suspend_global_flags;
212 :
213 : #define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0)
214 : #define PM_SUSPEND_FLAG_FW_RESUME BIT(1)
215 : #define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2)
216 :
217 : static inline void pm_suspend_clear_flags(void)
218 : {
219 0 : pm_suspend_global_flags = 0;
220 : }
221 :
222 : static inline void pm_set_suspend_via_firmware(void)
223 : {
224 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
225 : }
226 :
227 : static inline void pm_set_resume_via_firmware(void)
228 : {
229 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
230 : }
231 :
232 : static inline void pm_set_suspend_no_platform(void)
233 : {
234 0 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
235 : }
236 :
237 : /**
238 : * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
239 : *
240 : * To be called during system-wide power management transitions to sleep states
241 : * or during the subsequent system-wide transitions back to the working state.
242 : *
243 : * Return 'true' if the platform firmware is going to be invoked at the end of
244 : * the system-wide power management transition (to a sleep state) in progress in
245 : * order to complete it, or if the platform firmware has been invoked in order
246 : * to complete the last (or preceding) transition of the system to a sleep
247 : * state.
248 : *
249 : * This matters if the caller needs or wants to carry out some special actions
250 : * depending on whether or not control will be passed to the platform firmware
251 : * subsequently (for example, the device may need to be reset before letting the
252 : * platform firmware manipulate it, which is not necessary when the platform
253 : * firmware is not going to be invoked) or when such special actions may have
254 : * been carried out during the preceding transition of the system to a sleep
255 : * state (as they may need to be taken into account).
256 : */
257 : static inline bool pm_suspend_via_firmware(void)
258 : {
259 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
260 : }
261 :
262 : /**
263 : * pm_resume_via_firmware - Check if platform firmware has woken up the system.
264 : *
265 : * To be called during system-wide power management transitions from sleep
266 : * states.
267 : *
268 : * Return 'true' if the platform firmware has passed control to the kernel at
269 : * the beginning of the system-wide power management transition in progress, so
270 : * the event that woke up the system from sleep has been handled by the platform
271 : * firmware.
272 : */
273 : static inline bool pm_resume_via_firmware(void)
274 : {
275 0 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
276 : }
277 :
278 : /**
279 : * pm_suspend_no_platform - Check if platform may change device power states.
280 : *
281 : * To be called during system-wide power management transitions to sleep states
282 : * or during the subsequent system-wide transitions back to the working state.
283 : *
284 : * Return 'true' if the power states of devices remain under full control of the
285 : * kernel throughout the system-wide suspend and resume cycle in progress (that
286 : * is, if a device is put into a certain power state during suspend, it can be
287 : * expected to remain in that state during resume).
288 : */
289 : static inline bool pm_suspend_no_platform(void)
290 : {
291 0 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
292 : }
293 :
294 : /* Suspend-to-idle state machnine. */
295 : enum s2idle_states {
296 : S2IDLE_STATE_NONE, /* Not suspended/suspending. */
297 : S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
298 : S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
299 : };
300 :
301 : extern enum s2idle_states __read_mostly s2idle_state;
302 :
303 : static inline bool idle_should_enter_s2idle(void)
304 : {
305 : return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
306 : }
307 :
308 : extern bool pm_suspend_default_s2idle(void);
309 : extern void __init pm_states_init(void);
310 : extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
311 : extern void s2idle_wake(void);
312 :
313 : /**
314 : * arch_suspend_disable_irqs - disable IRQs for suspend
315 : *
316 : * Disables IRQs (in the default case). This is a weak symbol in the common
317 : * code and thus allows architectures to override it if more needs to be
318 : * done. Not called for suspend to disk.
319 : */
320 : extern void arch_suspend_disable_irqs(void);
321 :
322 : /**
323 : * arch_suspend_enable_irqs - enable IRQs after suspend
324 : *
325 : * Enables IRQs (in the default case). This is a weak symbol in the common
326 : * code and thus allows architectures to override it if more needs to be
327 : * done. Not called for suspend to disk.
328 : */
329 : extern void arch_suspend_enable_irqs(void);
330 :
331 : extern int pm_suspend(suspend_state_t state);
332 : extern bool sync_on_suspend_enabled;
333 : #else /* !CONFIG_SUSPEND */
334 : #define suspend_valid_only_mem NULL
335 :
336 : static inline void pm_suspend_clear_flags(void) {}
337 : static inline void pm_set_suspend_via_firmware(void) {}
338 : static inline void pm_set_resume_via_firmware(void) {}
339 : static inline bool pm_suspend_via_firmware(void) { return false; }
340 : static inline bool pm_resume_via_firmware(void) { return false; }
341 : static inline bool pm_suspend_no_platform(void) { return false; }
342 : static inline bool pm_suspend_default_s2idle(void) { return false; }
343 :
344 : static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
345 : static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
346 : static inline bool sync_on_suspend_enabled(void) { return true; }
347 : static inline bool idle_should_enter_s2idle(void) { return false; }
348 : static inline void __init pm_states_init(void) {}
349 : static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
350 : static inline void s2idle_wake(void) {}
351 : #endif /* !CONFIG_SUSPEND */
352 :
353 : /* struct pbe is used for creating lists of pages that should be restored
354 : * atomically during the resume from disk, because the page frames they have
355 : * occupied before the suspend are in use.
356 : */
357 : struct pbe {
358 : void *address; /* address of the copy */
359 : void *orig_address; /* original address of a page */
360 : struct pbe *next;
361 : };
362 :
363 : /* mm/page_alloc.c */
364 : extern void mark_free_pages(struct zone *zone);
365 :
366 : /**
367 : * struct platform_hibernation_ops - hibernation platform support
368 : *
369 : * The methods in this structure allow a platform to carry out special
370 : * operations required by it during a hibernation transition.
371 : *
372 : * All the methods below, except for @recover(), must be implemented.
373 : *
374 : * @begin: Tell the platform driver that we're starting hibernation.
375 : * Called right after shrinking memory and before freezing devices.
376 : *
377 : * @end: Called by the PM core right after resuming devices, to indicate to
378 : * the platform that the system has returned to the working state.
379 : *
380 : * @pre_snapshot: Prepare the platform for creating the hibernation image.
381 : * Called right after devices have been frozen and before the nonboot
382 : * CPUs are disabled (runs with IRQs on).
383 : *
384 : * @finish: Restore the previous state of the platform after the hibernation
385 : * image has been created *or* put the platform into the normal operation
386 : * mode after the hibernation (the same method is executed in both cases).
387 : * Called right after the nonboot CPUs have been enabled and before
388 : * thawing devices (runs with IRQs on).
389 : *
390 : * @prepare: Prepare the platform for entering the low power state.
391 : * Called right after the hibernation image has been saved and before
392 : * devices are prepared for entering the low power state.
393 : *
394 : * @enter: Put the system into the low power state after the hibernation image
395 : * has been saved to disk.
396 : * Called after the nonboot CPUs have been disabled and all of the low
397 : * level devices have been shut down (runs with IRQs off).
398 : *
399 : * @leave: Perform the first stage of the cleanup after the system sleep state
400 : * indicated by @set_target() has been left.
401 : * Called right after the control has been passed from the boot kernel to
402 : * the image kernel, before the nonboot CPUs are enabled and before devices
403 : * are resumed. Executed with interrupts disabled.
404 : *
405 : * @pre_restore: Prepare system for the restoration from a hibernation image.
406 : * Called right after devices have been frozen and before the nonboot
407 : * CPUs are disabled (runs with IRQs on).
408 : *
409 : * @restore_cleanup: Clean up after a failing image restoration.
410 : * Called right after the nonboot CPUs have been enabled and before
411 : * thawing devices (runs with IRQs on).
412 : *
413 : * @recover: Recover the platform from a failure to suspend devices.
414 : * Called by the PM core if the suspending of devices during hibernation
415 : * fails. This callback is optional and should only be implemented by
416 : * platforms which require special recovery actions in that situation.
417 : */
418 : struct platform_hibernation_ops {
419 : int (*begin)(pm_message_t stage);
420 : void (*end)(void);
421 : int (*pre_snapshot)(void);
422 : void (*finish)(void);
423 : int (*prepare)(void);
424 : int (*enter)(void);
425 : void (*leave)(void);
426 : int (*pre_restore)(void);
427 : void (*restore_cleanup)(void);
428 : void (*recover)(void);
429 : };
430 :
431 : #ifdef CONFIG_HIBERNATION
432 : /* kernel/power/snapshot.c */
433 : extern void register_nosave_region(unsigned long b, unsigned long e);
434 : extern int swsusp_page_is_forbidden(struct page *);
435 : extern void swsusp_set_page_free(struct page *);
436 : extern void swsusp_unset_page_free(struct page *);
437 : extern unsigned long get_safe_page(gfp_t gfp_mask);
438 : extern asmlinkage int swsusp_arch_suspend(void);
439 : extern asmlinkage int swsusp_arch_resume(void);
440 :
441 : extern u32 swsusp_hardware_signature;
442 : extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
443 : extern int hibernate(void);
444 : extern bool system_entering_hibernation(void);
445 : extern bool hibernation_available(void);
446 : asmlinkage int swsusp_save(void);
447 : extern struct pbe *restore_pblist;
448 : int pfn_is_nosave(unsigned long pfn);
449 :
450 : int hibernate_quiet_exec(int (*func)(void *data), void *data);
451 : #else /* CONFIG_HIBERNATION */
452 : static inline void register_nosave_region(unsigned long b, unsigned long e) {}
453 : static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
454 : static inline void swsusp_set_page_free(struct page *p) {}
455 : static inline void swsusp_unset_page_free(struct page *p) {}
456 :
457 : static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
458 : static inline int hibernate(void) { return -ENOSYS; }
459 : static inline bool system_entering_hibernation(void) { return false; }
460 : static inline bool hibernation_available(void) { return false; }
461 :
462 : static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
463 : return -ENOTSUPP;
464 : }
465 : #endif /* CONFIG_HIBERNATION */
466 :
467 : #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
468 : int is_hibernate_resume_dev(dev_t dev);
469 : #else
470 : static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
471 : #endif
472 :
473 : /* Hibernation and suspend events */
474 : #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
475 : #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
476 : #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
477 : #define PM_POST_SUSPEND 0x0004 /* Suspend finished */
478 : #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
479 : #define PM_POST_RESTORE 0x0006 /* Restore failed */
480 :
481 : extern struct mutex system_transition_mutex;
482 :
483 : #ifdef CONFIG_PM_SLEEP
484 : void save_processor_state(void);
485 : void restore_processor_state(void);
486 :
487 : /* kernel/power/main.c */
488 : extern int register_pm_notifier(struct notifier_block *nb);
489 : extern int unregister_pm_notifier(struct notifier_block *nb);
490 : extern void ksys_sync_helper(void);
491 :
492 : #define pm_notifier(fn, pri) { \
493 : static struct notifier_block fn##_nb = \
494 : { .notifier_call = fn, .priority = pri }; \
495 : register_pm_notifier(&fn##_nb); \
496 : }
497 :
498 : /* drivers/base/power/wakeup.c */
499 : extern bool events_check_enabled;
500 : extern suspend_state_t pm_suspend_target_state;
501 :
502 : extern bool pm_wakeup_pending(void);
503 : extern void pm_system_wakeup(void);
504 : extern void pm_system_cancel_wakeup(void);
505 : extern void pm_wakeup_clear(unsigned int irq_number);
506 : extern void pm_system_irq_wakeup(unsigned int irq_number);
507 : extern unsigned int pm_wakeup_irq(void);
508 : extern bool pm_get_wakeup_count(unsigned int *count, bool block);
509 : extern bool pm_save_wakeup_count(unsigned int count);
510 : extern void pm_wakep_autosleep_enabled(bool set);
511 : extern void pm_print_active_wakeup_sources(void);
512 :
513 : extern void lock_system_sleep(void);
514 : extern void unlock_system_sleep(void);
515 :
516 : #else /* !CONFIG_PM_SLEEP */
517 :
518 : static inline int register_pm_notifier(struct notifier_block *nb)
519 : {
520 : return 0;
521 : }
522 :
523 : static inline int unregister_pm_notifier(struct notifier_block *nb)
524 : {
525 : return 0;
526 : }
527 :
528 : static inline void ksys_sync_helper(void) {}
529 :
530 : #define pm_notifier(fn, pri) do { (void)(fn); } while (0)
531 :
532 : static inline bool pm_wakeup_pending(void) { return false; }
533 : static inline void pm_system_wakeup(void) {}
534 : static inline void pm_wakeup_clear(bool reset) {}
535 : static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
536 :
537 : static inline void lock_system_sleep(void) {}
538 : static inline void unlock_system_sleep(void) {}
539 :
540 : #endif /* !CONFIG_PM_SLEEP */
541 :
542 : #ifdef CONFIG_PM_SLEEP_DEBUG
543 : extern bool pm_print_times_enabled;
544 : extern bool pm_debug_messages_on;
545 : extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
546 : #else
547 : #define pm_print_times_enabled (false)
548 : #define pm_debug_messages_on (false)
549 :
550 : #include <linux/printk.h>
551 :
552 : #define __pm_pr_dbg(defer, fmt, ...) \
553 : no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
554 : #endif
555 :
556 : #define pm_pr_dbg(fmt, ...) \
557 : __pm_pr_dbg(false, fmt, ##__VA_ARGS__)
558 :
559 : #define pm_deferred_pr_dbg(fmt, ...) \
560 : __pm_pr_dbg(true, fmt, ##__VA_ARGS__)
561 :
562 : #ifdef CONFIG_PM_AUTOSLEEP
563 :
564 : /* kernel/power/autosleep.c */
565 : void queue_up_suspend_work(void);
566 :
567 : #else /* !CONFIG_PM_AUTOSLEEP */
568 :
569 : static inline void queue_up_suspend_work(void) {}
570 :
571 : #endif /* !CONFIG_PM_AUTOSLEEP */
572 :
573 : #endif /* _LINUX_SUSPEND_H */
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