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freezer: Have {,un}lock_system_sleep() save/restore flags

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Rafael explained that the reason for having both PF_NOFREEZE and
PF_FREEZER_SKIP is that {,un}lock_system_sleep() is callable from
kthread context that has previously called set_freezable().

In preparation of merging the flags, have {,un}lock_system_slee() save
and restore current->flags.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220822114648.725003428@infradead.org
This commit is contained in:
Peter Zijlstra
2022-08-22 13:18:17 +02:00
parent 0b9d46fc5e
commit 5950e5d574
7 changed files with 72 additions and 46 deletions
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include/linux/suspend.h
+4 -4
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@@ -510,8 +510,8 @@ extern bool pm_save_wakeup_count(unsigned int count);
extern void pm_wakep_autosleep_enabled(bool set);
extern void pm_print_active_wakeup_sources(void);
extern void lock_system_sleep(void);
extern void unlock_system_sleep(void);
extern unsigned int lock_system_sleep(void);
extern void unlock_system_sleep(unsigned int);
#else /* !CONFIG_PM_SLEEP */
@@ -534,8 +534,8 @@ static inline void pm_system_wakeup(void) {}
static inline void pm_wakeup_clear(bool reset) {}
static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}
static inline unsigned int lock_system_sleep(void) { return 0; }
static inline void unlock_system_sleep(unsigned int flags) {}
#endif /* !CONFIG_PM_SLEEP */