233 lines
8.0 KiB
C
233 lines
8.0 KiB
C
#ifndef _LINUX_SUSPEND_H
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#define _LINUX_SUSPEND_H
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#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)
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#include <asm/suspend.h>
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#endif
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#include <linux/swap.h>
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#include <linux/notifier.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/mm.h>
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#include <asm/errno.h>
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#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
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extern int pm_prepare_console(void);
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extern void pm_restore_console(void);
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#else
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static inline int pm_prepare_console(void) { return 0; }
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static inline void pm_restore_console(void) {}
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#endif
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typedef int __bitwise suspend_state_t;
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#define PM_SUSPEND_ON ((__force suspend_state_t) 0)
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#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1)
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#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
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#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
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/**
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* struct pm_ops - Callbacks for managing platform dependent system sleep
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* states.
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*
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* @valid: Callback to determine if given system sleep state is supported by
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* the platform.
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* Valid (ie. supported) states are advertised in /sys/power/state. Note
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* that it still may be impossible to enter given system sleep state if the
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* conditions aren't right.
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* There is the %pm_valid_only_mem function available that can be assigned
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* to this if the platform only supports mem sleep.
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*
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* @set_target: Tell the platform which system sleep state is going to be
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* entered.
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* @set_target() is executed right prior to suspending devices. The
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* information conveyed to the platform code by @set_target() should be
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* disregarded by the platform as soon as @finish() is executed and if
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* @prepare() fails. If @set_target() fails (ie. returns nonzero),
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* @prepare(), @enter() and @finish() will not be called by the PM core.
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* This callback is optional. However, if it is implemented, the argument
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* passed to @prepare(), @enter() and @finish() is meaningless and should
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* be ignored.
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*
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* @prepare: Prepare the platform for entering the system sleep state indicated
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* by @set_target() or represented by the argument if @set_target() is not
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* implemented.
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* @prepare() is called right after devices have been suspended (ie. the
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* appropriate .suspend() method has been executed for each device) and
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* before the nonboot CPUs are disabled (it is executed with IRQs enabled).
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* This callback is optional. It returns 0 on success or a negative
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* error code otherwise, in which case the system cannot enter the desired
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* sleep state (@enter() and @finish() will not be called in that case).
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*
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* @enter: Enter the system sleep state indicated by @set_target() or
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* represented by the argument if @set_target() is not implemented.
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* This callback is mandatory. It returns 0 on success or a negative
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* error code otherwise, in which case the system cannot enter the desired
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* sleep state.
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*
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* @finish: Called when the system has just left a sleep state, right after
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* the nonboot CPUs have been enabled and before devices are resumed (it is
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* executed with IRQs enabled). If @set_target() is not implemented, the
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* argument represents the sleep state being left.
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* This callback is optional, but should be implemented by the platforms
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* that implement @prepare(). If implemented, it is always called after
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* @enter() (even if @enter() fails).
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*/
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struct pm_ops {
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int (*valid)(suspend_state_t state);
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int (*set_target)(suspend_state_t state);
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int (*prepare)(suspend_state_t state);
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int (*enter)(suspend_state_t state);
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int (*finish)(suspend_state_t state);
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};
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#ifdef CONFIG_SUSPEND
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extern struct pm_ops *pm_ops;
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/**
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* pm_set_ops - set platform dependent power management ops
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* @pm_ops: The new power management operations to set.
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*/
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extern void pm_set_ops(struct pm_ops *pm_ops);
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extern int pm_valid_only_mem(suspend_state_t state);
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/**
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* arch_suspend_disable_irqs - disable IRQs for suspend
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*
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* Disables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_disable_irqs(void);
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/**
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* arch_suspend_enable_irqs - enable IRQs after suspend
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*
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* Enables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_enable_irqs(void);
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extern int pm_suspend(suspend_state_t state);
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#else /* !CONFIG_SUSPEND */
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#define suspend_valid_only_mem NULL
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static inline void pm_set_ops(struct pm_ops *pm_ops) {}
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static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
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#endif /* !CONFIG_SUSPEND */
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/* struct pbe is used for creating lists of pages that should be restored
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* atomically during the resume from disk, because the page frames they have
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* occupied before the suspend are in use.
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*/
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struct pbe {
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void *address; /* address of the copy */
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void *orig_address; /* original address of a page */
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struct pbe *next;
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};
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/* mm/page_alloc.c */
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extern void drain_local_pages(void);
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extern void mark_free_pages(struct zone *zone);
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/**
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* struct hibernation_ops - hibernation platform support
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*
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* The methods in this structure allow a platform to override the default
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* mechanism of shutting down the machine during a hibernation transition.
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*
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* All three methods must be assigned.
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*
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* @prepare: prepare system for hibernation
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* @enter: shut down system after state has been saved to disk
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* @finish: finish/clean up after state has been reloaded
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* @pre_restore: prepare system for the restoration from a hibernation image
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* @restore_cleanup: clean up after a failing image restoration
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*/
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struct hibernation_ops {
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int (*prepare)(void);
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int (*enter)(void);
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void (*finish)(void);
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int (*pre_restore)(void);
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void (*restore_cleanup)(void);
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};
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#ifdef CONFIG_HIBERNATION
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/* kernel/power/snapshot.c */
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extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
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static inline void register_nosave_region(unsigned long b, unsigned long e)
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{
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__register_nosave_region(b, e, 0);
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}
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static inline void register_nosave_region_late(unsigned long b, unsigned long e)
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{
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__register_nosave_region(b, e, 1);
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}
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extern int swsusp_page_is_forbidden(struct page *);
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extern void swsusp_set_page_free(struct page *);
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extern void swsusp_unset_page_free(struct page *);
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extern unsigned long get_safe_page(gfp_t gfp_mask);
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extern void hibernation_set_ops(struct hibernation_ops *ops);
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extern int hibernate(void);
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#else /* CONFIG_HIBERNATION */
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static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
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static inline void swsusp_set_page_free(struct page *p) {}
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static inline void swsusp_unset_page_free(struct page *p) {}
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static inline void hibernation_set_ops(struct hibernation_ops *ops) {}
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static inline int hibernate(void) { return -ENOSYS; }
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#endif /* CONFIG_HIBERNATION */
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#ifdef CONFIG_PM_SLEEP
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void save_processor_state(void);
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void restore_processor_state(void);
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struct saved_context;
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void __save_processor_state(struct saved_context *ctxt);
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void __restore_processor_state(struct saved_context *ctxt);
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/* kernel/power/main.c */
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extern struct blocking_notifier_head pm_chain_head;
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static inline int register_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&pm_chain_head, nb);
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}
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static inline int unregister_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&pm_chain_head, nb);
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}
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#define pm_notifier(fn, pri) { \
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static struct notifier_block fn##_nb = \
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{ .notifier_call = fn, .priority = pri }; \
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register_pm_notifier(&fn##_nb); \
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}
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#else /* !CONFIG_PM_SLEEP */
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static inline int register_pm_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int unregister_pm_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
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#endif /* !CONFIG_PM_SLEEP */
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#ifndef CONFIG_HIBERNATION
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static inline void register_nosave_region(unsigned long b, unsigned long e)
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{
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}
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static inline void register_nosave_region_late(unsigned long b, unsigned long e)
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{
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}
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#endif
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#endif /* _LINUX_SUSPEND_H */
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