Release 4.7 include/linux/freezer.h

Directory: include/linux
/* 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>

#ifdef CONFIG_FREEZER
extern atomic_t system_freezing_cnt;	/* nr of freezing conds in effect */
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
 */


static inline bool frozen(struct task_struct *p)
{
	return p->flags & PF_FROZEN;
}

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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 (likely(!atomic_read(&system_freezing_cnt)))
		return false;
	return freezing_slow_path(p);
}

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/* 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);

/*
 * DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION
 * If try_to_freeze causes a lockdep warning it means the caller may deadlock
 */


static inline bool try_to_freeze_unsafe(void)
{
	might_sleep();
	if (likely(!freezing(current)))
		return false;
	return __refrigerator(false);
}

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Total 32 100.00% 4 100.00%



static inline bool try_to_freeze(void)
{
	if (!(current->flags & PF_NOFREEZE))
		debug_check_no_locks_held();
	return try_to_freeze_unsafe();
}

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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;
}
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#endif /* !CONFIG_CGROUP_FREEZER */

/*
 * The PF_FREEZER_SKIP flag should be set by a vfork parent right before it
 * calls wait_for_completion(&vfork) and reset right after it returns from this
 * function.  Next, the parent should call try_to_freeze() to freeze itself
 * appropriately in case the child has exited before the freezing of tasks is
 * complete.  However, we don't want kernel threads to be frozen in unexpected
 * places, so we allow them to block freeze_processes() instead or to set
 * PF_NOFREEZE if needed. Fortunately, in the ____call_usermodehelper() case the
 * parent won't really block freeze_processes(), since ____call_usermodehelper()
 * (the child) does a little before exec/exit and it can't be frozen before
 * waking up the parent.
 */


/**
 * freezer_do_not_count - tell freezer to ignore %current
 *
 * Tell freezers to ignore the current task when determining whether the
 * target frozen state is reached.  IOW, the current task will be
 * considered frozen enough by freezers.
 *
 * The caller shouldn't do anything which isn't allowed for a frozen task
 * until freezer_cont() is called.  Usually, freezer[_do_not]_count() pair
 * wrap a scheduling operation and nothing much else.
 */


static inline void freezer_do_not_count(void)
{
	current->flags |= PF_FREEZER_SKIP;
}

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/**
 * freezer_count - tell freezer to stop ignoring %current
 *
 * Undo freezer_do_not_count().  It tells freezers that %current should be
 * considered again and tries to freeze if freezing condition is already in
 * effect.
 */


static inline void freezer_count(void)
{
	current->flags &= ~PF_FREEZER_SKIP;
	/*
         * If freezing is in progress, the following paired with smp_mb()
         * in freezer_should_skip() ensures that either we see %true
         * freezing() or freezer_should_skip() sees !PF_FREEZER_SKIP.
         */
	smp_mb();
	try_to_freeze();
}

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Total 23 100.00% 3 100.00%

/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */


static inline void freezer_count_unsafe(void)
{
	current->flags &= ~PF_FREEZER_SKIP;
	smp_mb();
	try_to_freeze_unsafe();
}

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/**
 * freezer_should_skip - whether to skip a task when determining frozen
 *                       state is reached
 * @p: task in quesion
 *
 * This function is used by freezers after establishing %true freezing() to
 * test whether a task should be skipped when determining the target frozen
 * state is reached.  IOW, if this function returns %true, @p is considered
 * frozen enough.
 */


static inline bool freezer_should_skip(struct task_struct *p)
{
	/*
         * The following smp_mb() paired with the one in freezer_count()
         * ensures that either freezer_count() sees %true freezing() or we
         * see cleared %PF_FREEZER_SKIP and return %false.  This makes it
         * impossible for a task to slip frozen state testing after
         * clearing %PF_FREEZER_SKIP.
         */
	smp_mb();
	return p->flags & PF_FREEZER_SKIP;
}

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/*
 * These functions are intended to be used whenever you want allow a sleeping
 * task to be frozen. Note that neither return any clear indication of
 * whether a freeze event happened while in this function.
 */

/* Like schedule(), but should not block the freezer. */


static inline void freezable_schedule(void)
{
	freezer_do_not_count();
	schedule();
	freezer_count();
}

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/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */


static inline void freezable_schedule_unsafe(void)
{
	freezer_do_not_count();
	schedule();
	freezer_count_unsafe();
}

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/*
 * Like freezable_schedule_timeout(), but should not block the freezer.  Do not
 * call this with locks held.
 */


static inline long freezable_schedule_timeout(long timeout)
{
	long __retval;
	freezer_do_not_count();
	__retval = schedule_timeout(timeout);
	freezer_count();
	return __retval;
}

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/*
 * Like schedule_timeout_interruptible(), but should not block the freezer.  Do not
 * call this with locks held.
 */


static inline long freezable_schedule_timeout_interruptible(long timeout)
{
	long __retval;
	freezer_do_not_count();
	__retval = schedule_timeout_interruptible(timeout);
	freezer_count();
	return __retval;
}

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/* Like schedule_timeout_killable(), but should not block the freezer. */


static inline long freezable_schedule_timeout_killable(long timeout)
{
	long __retval;
	freezer_do_not_count();
	__retval = schedule_timeout_killable(timeout);
	freezer_count();
	return __retval;
}

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/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */


static inline long freezable_schedule_timeout_killable_unsafe(long timeout)
{
	long __retval;
	freezer_do_not_count();
	__retval = schedule_timeout_killable(timeout);
	freezer_count_unsafe();
	return __retval;
}

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/*
 * Like schedule_hrtimeout_range(), but should not block the freezer.  Do not
 * call this with locks held.
 */


static inline int freezable_schedule_hrtimeout_range(ktime_t *expires,
		u64 delta, const enum hrtimer_mode mode)
{
	int __retval;
	freezer_do_not_count();
	__retval = schedule_hrtimeout_range(expires, delta, mode);
	freezer_count();
	return __retval;
}

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/*
 * Freezer-friendly wrappers around wait_event_interruptible(),
 * wait_event_killable() and wait_event_interruptible_timeout(), originally
 * defined in <linux/wait.h>
 */

/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */

#define wait_event_freezekillable_unsafe(wq, condition)			\
({                                                                      \
        int __retval;                                                   \
        freezer_do_not_count();                                         \
        __retval = wait_event_killable(wq, (condition));                \
        freezer_count_unsafe();                                         \
        __retval;                                                       \
})

#else /* !CONFIG_FREEZER */


static inline bool frozen(struct task_struct *p) { return false; }
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static inline bool freezing(struct task_struct *p) { return false; }
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static inline void __thaw_task(struct task_struct *t) {}

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static inline bool __refrigerator(bool check_kthr_stop) { return false; }
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static inline int freeze_processes(void) { return -ENOSYS; }
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static inline int freeze_kernel_threads(void) { return -ENOSYS; }
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static inline void thaw_processes(void) {}
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static inline void thaw_kernel_threads(void) {}

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static inline bool try_to_freeze_nowarn(void) { return false; }
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static inline bool try_to_freeze(void) { return false; }

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static inline void freezer_do_not_count(void) {}
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static inline void freezer_count(void) {}
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static inline int freezer_should_skip(struct task_struct *p) { return 0; }
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static inline void set_freezable(void) {}

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#define freezable_schedule()  schedule()


#define freezable_schedule_unsafe()  schedule()


#define freezable_schedule_timeout(timeout)  schedule_timeout(timeout)


#define freezable_schedule_timeout_interruptible(timeout)		\
	schedule_timeout_interruptible(timeout)


#define freezable_schedule_timeout_killable(timeout)			\
	schedule_timeout_killable(timeout)


#define freezable_schedule_timeout_killable_unsafe(timeout)		\
	schedule_timeout_killable(timeout)


#define freezable_schedule_hrtimeout_range(expires, delta, mode)	\
	schedule_hrtimeout_range(expires, delta, mode)


#define wait_event_freezekillable_unsafe(wq, condition)			\
		wait_event_killable(wq, condition)

#endif /* !CONFIG_FREEZER */

#endif	/* FREEZER_H_INCLUDED */
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mandeep singh baines mandeep singh baines 17 2.13% 1 2.94%
li haifeng li haifeng 12 1.50% 1 2.94%
stephen rothwell stephen rothwell 11 1.38% 1 2.94%
li fei li fei 6 0.75% 1 2.94%
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  Directory: include/linux

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cregit-Linux how code gets into the kernel

Release 4.7 include/linux/freezer.h

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