include/linux/suspend.h

   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         strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
  79                 name,
  80                 sizeof(suspend_stats.failed_devs[0]));
  81         suspend_stats.last_failed_dev++;
  82         suspend_stats.last_failed_dev %= REC_FAILED_NUM;
  83 }
  84
  85 static inline void dpm_save_failed_errno(int err)
  86 {
  87         suspend_stats.errno[suspend_stats.last_failed_errno] = err;
  88         suspend_stats.last_failed_errno++;
  89         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         suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
  95         suspend_stats.last_failed_step++;
  96         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         void (*wake)(void);
 194         void (*sync)(void);
 195         void (*restore)(void);
 196         void (*end)(void);
 197 };
 198
 199 #ifdef CONFIG_SUSPEND
 200 extern suspend_state_t mem_sleep_current;
 201 extern suspend_state_t mem_sleep_default;
 202
 203 /**
 204  * suspend_set_ops - set platform dependent suspend operations
 205  * @ops: The new suspend operations to set.
 206  */
 207 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
 208 extern int suspend_valid_only_mem(suspend_state_t state);
 209
 210 extern unsigned int pm_suspend_global_flags;
 211
 212 #define PM_SUSPEND_FLAG_FW_SUSPEND      (1 << 0)
 213 #define PM_SUSPEND_FLAG_FW_RESUME       (1 << 1)
 214
 215 static inline void pm_suspend_clear_flags(void)
 216 {
 217         pm_suspend_global_flags = 0;
 218 }
 219
 220 static inline void pm_set_suspend_via_firmware(void)
 221 {
 222         pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
 223 }
 224
 225 static inline void pm_set_resume_via_firmware(void)
 226 {
 227         pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
 228 }
 229
 230 /**
 231  * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
 232  *
 233  * To be called during system-wide power management transitions to sleep states
 234  * or during the subsequent system-wide transitions back to the working state.
 235  *
 236  * Return 'true' if the platform firmware is going to be invoked at the end of
 237  * the system-wide power management transition (to a sleep state) in progress in
 238  * order to complete it, or if the platform firmware has been invoked in order
 239  * to complete the last (or preceding) transition of the system to a sleep
 240  * state.
 241  *
 242  * This matters if the caller needs or wants to carry out some special actions
 243  * depending on whether or not control will be passed to the platform firmware
 244  * subsequently (for example, the device may need to be reset before letting the
 245  * platform firmware manipulate it, which is not necessary when the platform
 246  * firmware is not going to be invoked) or when such special actions may have
 247  * been carried out during the preceding transition of the system to a sleep
 248  * state (as they may need to be taken into account).
 249  */
 250 static inline bool pm_suspend_via_firmware(void)
 251 {
 252         return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
 253 }
 254
 255 /**
 256  * pm_resume_via_firmware - Check if platform firmware has woken up the system.
 257  *
 258  * To be called during system-wide power management transitions from sleep
 259  * states.
 260  *
 261  * Return 'true' if the platform firmware has passed control to the kernel at
 262  * the beginning of the system-wide power management transition in progress, so
 263  * the event that woke up the system from sleep has been handled by the platform
 264  * firmware.
 265  */
 266 static inline bool pm_resume_via_firmware(void)
 267 {
 268         return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
 269 }
 270
 271 /* Suspend-to-idle state machnine. */
 272 enum s2idle_states {
 273         S2IDLE_STATE_NONE,      /* Not suspended/suspending. */
 274         S2IDLE_STATE_ENTER,     /* Enter suspend-to-idle. */
 275         S2IDLE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
 276 };
 277
 278 extern enum s2idle_states __read_mostly s2idle_state;
 279
 280 static inline bool idle_should_enter_s2idle(void)
 281 {
 282         return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
 283 }
 284
 285 extern bool pm_suspend_via_s2idle(void);
 286 extern void __init pm_states_init(void);
 287 extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
 288 extern void s2idle_wake(void);
 289
 290 /**
 291  * arch_suspend_disable_irqs - disable IRQs for suspend
 292  *
 293  * Disables IRQs (in the default case). This is a weak symbol in the common
 294  * code and thus allows architectures to override it if more needs to be
 295  * done. Not called for suspend to disk.
 296  */
 297 extern void arch_suspend_disable_irqs(void);
 298
 299 /**
 300  * arch_suspend_enable_irqs - enable IRQs after suspend
 301  *
 302  * Enables IRQs (in the default case). This is a weak symbol in the common
 303  * code and thus allows architectures to override it if more needs to be
 304  * done. Not called for suspend to disk.
 305  */
 306 extern void arch_suspend_enable_irqs(void);
 307
 308 extern int pm_suspend(suspend_state_t state);
 309 #else /* !CONFIG_SUSPEND */
 310 #define suspend_valid_only_mem  NULL
 311
 312 static inline void pm_suspend_clear_flags(void) {}
 313 static inline void pm_set_suspend_via_firmware(void) {}
 314 static inline void pm_set_resume_via_firmware(void) {}
 315 static inline bool pm_suspend_via_firmware(void) { return false; }
 316 static inline bool pm_resume_via_firmware(void) { return false; }
 317 static inline bool pm_suspend_via_s2idle(void) { return false; }
 318
 319 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
 320 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 321 static inline bool idle_should_enter_s2idle(void) { return false; }
 322 static inline void __init pm_states_init(void) {}
 323 static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
 324 static inline void s2idle_wake(void) {}
 325 #endif /* !CONFIG_SUSPEND */
 326
 327 /* struct pbe is used for creating lists of pages that should be restored
 328  * atomically during the resume from disk, because the page frames they have
 329  * occupied before the suspend are in use.
 330  */
 331 struct pbe {
 332         void *address;          /* address of the copy */
 333         void *orig_address;     /* original address of a page */
 334         struct pbe *next;
 335 };
 336
 337 /* mm/page_alloc.c */
 338 extern void mark_free_pages(struct zone *zone);
 339
 340 /**
 341  * struct platform_hibernation_ops - hibernation platform support
 342  *
 343  * The methods in this structure allow a platform to carry out special
 344  * operations required by it during a hibernation transition.
 345  *
 346  * All the methods below, except for @recover(), must be implemented.
 347  *
 348  * @begin: Tell the platform driver that we're starting hibernation.
 349  *      Called right after shrinking memory and before freezing devices.
 350  *
 351  * @end: Called by the PM core right after resuming devices, to indicate to
 352  *      the platform that the system has returned to the working state.
 353  *
 354  * @pre_snapshot: Prepare the platform for creating the hibernation image.
 355  *      Called right after devices have been frozen and before the nonboot
 356  *      CPUs are disabled (runs with IRQs on).
 357  *
 358  * @finish: Restore the previous state of the platform after the hibernation
 359  *      image has been created *or* put the platform into the normal operation
 360  *      mode after the hibernation (the same method is executed in both cases).
 361  *      Called right after the nonboot CPUs have been enabled and before
 362  *      thawing devices (runs with IRQs on).
 363  *
 364  * @prepare: Prepare the platform for entering the low power state.
 365  *      Called right after the hibernation image has been saved and before
 366  *      devices are prepared for entering the low power state.
 367  *
 368  * @enter: Put the system into the low power state after the hibernation image
 369  *      has been saved to disk.
 370  *      Called after the nonboot CPUs have been disabled and all of the low
 371  *      level devices have been shut down (runs with IRQs off).
 372  *
 373  * @leave: Perform the first stage of the cleanup after the system sleep state
 374  *      indicated by @set_target() has been left.
 375  *      Called right after the control has been passed from the boot kernel to
 376  *      the image kernel, before the nonboot CPUs are enabled and before devices
 377  *      are resumed.  Executed with interrupts disabled.
 378  *
 379  * @pre_restore: Prepare system for the restoration from a hibernation image.
 380  *      Called right after devices have been frozen and before the nonboot
 381  *      CPUs are disabled (runs with IRQs on).
 382  *
 383  * @restore_cleanup: Clean up after a failing image restoration.
 384  *      Called right after the nonboot CPUs have been enabled and before
 385  *      thawing devices (runs with IRQs on).
 386  *
 387  * @recover: Recover the platform from a failure to suspend devices.
 388  *      Called by the PM core if the suspending of devices during hibernation
 389  *      fails.  This callback is optional and should only be implemented by
 390  *      platforms which require special recovery actions in that situation.
 391  */
 392 struct platform_hibernation_ops {
 393         int (*begin)(pm_message_t stage);
 394         void (*end)(void);
 395         int (*pre_snapshot)(void);
 396         void (*finish)(void);
 397         int (*prepare)(void);
 398         int (*enter)(void);
 399         void (*leave)(void);
 400         int (*pre_restore)(void);
 401         void (*restore_cleanup)(void);
 402         void (*recover)(void);
 403 };
 404
 405 #ifdef CONFIG_HIBERNATION
 406 /* kernel/power/snapshot.c */
 407 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
 408 static inline void __init register_nosave_region(unsigned long b, unsigned long e)
 409 {
 410         __register_nosave_region(b, e, 0);
 411 }
 412 static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
 413 {
 414         __register_nosave_region(b, e, 1);
 415 }
 416 extern int swsusp_page_is_forbidden(struct page *);
 417 extern void swsusp_set_page_free(struct page *);
 418 extern void swsusp_unset_page_free(struct page *);
 419 extern unsigned long get_safe_page(gfp_t gfp_mask);
 420 extern asmlinkage int swsusp_arch_suspend(void);
 421 extern asmlinkage int swsusp_arch_resume(void);
 422
 423 extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
 424 extern int hibernate(void);
 425 extern bool system_entering_hibernation(void);
 426 extern bool hibernation_available(void);
 427 asmlinkage int swsusp_save(void);
 428 extern struct pbe *restore_pblist;
 429 #else /* CONFIG_HIBERNATION */
 430 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
 431 static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
 432 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 433 static inline void swsusp_set_page_free(struct page *p) {}
 434 static inline void swsusp_unset_page_free(struct page *p) {}
 435
 436 static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
 437 static inline int hibernate(void) { return -ENOSYS; }
 438 static inline bool system_entering_hibernation(void) { return false; }
 439 static inline bool hibernation_available(void) { return false; }
 440 #endif /* CONFIG_HIBERNATION */
 441
 442 /* Hibernation and suspend events */
 443 #define PM_HIBERNATION_PREPARE  0x0001 /* Going to hibernate */
 444 #define PM_POST_HIBERNATION     0x0002 /* Hibernation finished */
 445 #define PM_SUSPEND_PREPARE      0x0003 /* Going to suspend the system */
 446 #define PM_POST_SUSPEND         0x0004 /* Suspend finished */
 447 #define PM_RESTORE_PREPARE      0x0005 /* Going to restore a saved image */
 448 #define PM_POST_RESTORE         0x0006 /* Restore failed */
 449
 450 extern struct mutex system_transition_mutex;
 451
 452 #ifdef CONFIG_PM_SLEEP
 453 void save_processor_state(void);
 454 void restore_processor_state(void);
 455
 456 /* kernel/power/main.c */
 457 extern int register_pm_notifier(struct notifier_block *nb);
 458 extern int unregister_pm_notifier(struct notifier_block *nb);
 459 extern void ksys_sync_helper(void);
 460
 461 #define pm_notifier(fn, pri) {                          \
 462         static struct notifier_block fn##_nb =                  \
 463                 { .notifier_call = fn, .priority = pri };       \
 464         register_pm_notifier(&fn##_nb);                 \
 465 }
 466
 467 /* drivers/base/power/wakeup.c */
 468 extern bool events_check_enabled;
 469 extern unsigned int pm_wakeup_irq;
 470 extern suspend_state_t pm_suspend_target_state;
 471
 472 extern bool pm_wakeup_pending(void);
 473 extern void pm_system_wakeup(void);
 474 extern void pm_system_cancel_wakeup(void);
 475 extern void pm_wakeup_clear(bool reset);
 476 extern void pm_system_irq_wakeup(unsigned int irq_number);
 477 extern bool pm_get_wakeup_count(unsigned int *count, bool block);
 478 extern bool pm_save_wakeup_count(unsigned int count);
 479 extern void pm_wakep_autosleep_enabled(bool set);
 480 extern void pm_print_active_wakeup_sources(void);
 481
 482 extern void lock_system_sleep(void);
 483 extern void unlock_system_sleep(void);
 484
 485 #else /* !CONFIG_PM_SLEEP */
 486
 487 static inline int register_pm_notifier(struct notifier_block *nb)
 488 {
 489         return 0;
 490 }
 491
 492 static inline int unregister_pm_notifier(struct notifier_block *nb)
 493 {
 494         return 0;
 495 }
 496
 497 static inline void ksys_sync_helper(void) {}
 498
 499 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 500
 501 static inline bool pm_wakeup_pending(void) { return false; }
 502 static inline void pm_system_wakeup(void) {}
 503 static inline void pm_wakeup_clear(bool reset) {}
 504 static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
 505
 506 static inline void lock_system_sleep(void) {}
 507 static inline void unlock_system_sleep(void) {}
 508
 509 #endif /* !CONFIG_PM_SLEEP */
 510
 511 #ifdef CONFIG_PM_SLEEP_DEBUG
 512 extern bool pm_print_times_enabled;
 513 extern bool pm_debug_messages_on;
 514 extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
 515 #else
 516 #define pm_print_times_enabled  (false)
 517 #define pm_debug_messages_on    (false)
 518
 519 #include <linux/printk.h>
 520
 521 #define __pm_pr_dbg(defer, fmt, ...) \
 522         no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
 523 #endif
 524
 525 #define pm_pr_dbg(fmt, ...) \
 526         __pm_pr_dbg(false, fmt, ##__VA_ARGS__)
 527
 528 #define pm_deferred_pr_dbg(fmt, ...) \
 529         __pm_pr_dbg(true, fmt, ##__VA_ARGS__)
 530
 531 #ifdef CONFIG_PM_AUTOSLEEP
 532
 533 /* kernel/power/autosleep.c */
 534 void queue_up_suspend_work(void);
 535
 536 #else /* !CONFIG_PM_AUTOSLEEP */
 537
 538 static inline void queue_up_suspend_work(void) {}
 539
 540 #endif /* !CONFIG_PM_AUTOSLEEP */
 541
 542 #ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
 543 /*
 544  * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
 545  * to save/restore additional information to/from the array of page
 546  * frame numbers in the hibernation image. For s390 this is used to
 547  * save and restore the storage key for each page that is included
 548  * in the hibernation image.
 549  */
 550 unsigned long page_key_additional_pages(unsigned long pages);
 551 int page_key_alloc(unsigned long pages);
 552 void page_key_free(void);
 553 void page_key_read(unsigned long *pfn);
 554 void page_key_memorize(unsigned long *pfn);
 555 void page_key_write(void *address);
 556
 557 #else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
 558
 559 static inline unsigned long page_key_additional_pages(unsigned long pages)
 560 {
 561         return 0;
 562 }
 563
 564 static inline int  page_key_alloc(unsigned long pages)
 565 {
 566         return 0;
 567 }
 568
 569 static inline void page_key_free(void) {}
 570 static inline void page_key_read(unsigned long *pfn) {}
 571 static inline void page_key_memorize(unsigned long *pfn) {}
 572 static inline void page_key_write(void *address) {}
 573
 574 #endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
 575
 576 #endif /* _LINUX_SUSPEND_H */