Release 4.12 include/linux/sched/idle.h

#ifndef _LINUX_SCHED_IDLE_H

#define _LINUX_SCHED_IDLE_H

#include <linux/sched.h>


enum cpu_idle_type {
	
CPU_IDLE,
	
CPU_NOT_IDLE,
	
CPU_NEWLY_IDLE,
	
CPU_MAX_IDLE_TYPES
};

extern void wake_up_if_idle(int cpu);

/*
 * Idle thread specific functions to determine the need_resched
 * polling state.
 */
#ifdef TIF_POLLING_NRFLAG



static inline void __current_set_polling(void)
{
	set_thread_flag(TIF_POLLING_NRFLAG);
}

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static inline bool __must_check current_set_polling_and_test(void)
{
	__current_set_polling();

	/*
         * Polling state must be visible before we test NEED_RESCHED,
         * paired by resched_curr()
         */
	smp_mb__after_atomic();

	return unlikely(tif_need_resched());
}

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static inline void __current_clr_polling(void)
{
	clear_thread_flag(TIF_POLLING_NRFLAG);
}

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static inline bool __must_check current_clr_polling_and_test(void)
{
	__current_clr_polling();

	/*
         * Polling state must be visible before we test NEED_RESCHED,
         * paired by resched_curr()
         */
	smp_mb__after_atomic();

	return unlikely(tif_need_resched());
}

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#else


static inline void __current_set_polling(void) { }
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static inline void __current_clr_polling(void) { }

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static inline bool __must_check current_set_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
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static inline bool __must_check current_clr_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
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#endif



static inline void current_clr_polling(void)
{
	__current_clr_polling();

	/*
         * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
         * Once the bit is cleared, we'll get IPIs with every new
         * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
         * fold.
         */
	smp_mb(); /* paired with resched_curr() */

	preempt_fold_need_resched();
}

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#endif /* _LINUX_SCHED_IDLE_H */
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Directory: include/linux/sched

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