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- /* SPDX-License-Identifier: GPL-2.0 */
- /* Freezer declarations */
- #ifndef FREEZER_H_INCLUDED
- #define FREEZER_H_INCLUDED
- #include <linux/debug_locks.h>
- #include <linux/sched.h>
- #include <linux/wait.h>
- #include <linux/atomic.h>
- #include <linux/jump_label.h>
- #ifdef CONFIG_FREEZER
- DECLARE_STATIC_KEY_FALSE(freezer_active);
- extern bool pm_freezing; /* PM freezing in effect */
- extern bool pm_nosig_freezing; /* PM nosig freezing in effect */
- /*
- * Timeout for stopping processes
- */
- extern unsigned int freeze_timeout_msecs;
- /*
- * Check if a process has been frozen
- */
- extern bool frozen(struct task_struct *p);
- extern bool freezing_slow_path(struct task_struct *p);
- /*
- * Check if there is a request to freeze a process
- */
- static inline bool freezing(struct task_struct *p)
- {
- if (static_branch_unlikely(&freezer_active))
- return freezing_slow_path(p);
- return false;
- }
- /* Takes and releases task alloc lock using task_lock() */
- extern void __thaw_task(struct task_struct *t);
- extern bool __refrigerator(bool check_kthr_stop);
- extern int freeze_processes(void);
- extern int freeze_kernel_threads(void);
- extern void thaw_processes(void);
- extern void thaw_kernel_threads(void);
- static inline bool try_to_freeze(void)
- {
- might_sleep();
- if (likely(!freezing(current)))
- return false;
- if (!(current->flags & PF_NOFREEZE))
- debug_check_no_locks_held();
- return __refrigerator(false);
- }
- extern bool freeze_task(struct task_struct *p);
- extern bool set_freezable(void);
- #ifdef CONFIG_CGROUP_FREEZER
- extern bool cgroup_freezing(struct task_struct *task);
- #else /* !CONFIG_CGROUP_FREEZER */
- static inline bool cgroup_freezing(struct task_struct *task)
- {
- return false;
- }
- #endif /* !CONFIG_CGROUP_FREEZER */
- #else /* !CONFIG_FREEZER */
- static inline bool frozen(struct task_struct *p) { return false; }
- static inline bool freezing(struct task_struct *p) { return false; }
- static inline void __thaw_task(struct task_struct *t) {}
- static inline bool __refrigerator(bool check_kthr_stop) { return false; }
- static inline int freeze_processes(void) { return -ENOSYS; }
- static inline int freeze_kernel_threads(void) { return -ENOSYS; }
- static inline void thaw_processes(void) {}
- static inline void thaw_kernel_threads(void) {}
- static inline bool try_to_freeze(void) { return false; }
- static inline void set_freezable(void) {}
- #endif /* !CONFIG_FREEZER */
- #endif /* FREEZER_H_INCLUDED */
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