/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_IDLE_H
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#define _LINUX_SCHED_IDLE_H
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#include <linux/sched.h>
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enum cpu_idle_type {
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CPU_IDLE,
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CPU_NOT_IDLE,
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CPU_NEWLY_IDLE,
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CPU_MAX_IDLE_TYPES
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};
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extern void wake_up_if_idle(int cpu);
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/*
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* Idle thread specific functions to determine the need_resched
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* polling state.
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*/
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#ifdef TIF_POLLING_NRFLAG
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static inline void __current_set_polling(void)
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{
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set_thread_flag(TIF_POLLING_NRFLAG);
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}
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static inline bool __must_check current_set_polling_and_test(void)
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{
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__current_set_polling();
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/*
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* Polling state must be visible before we test NEED_RESCHED,
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* paired by resched_curr()
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*/
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smp_mb__after_atomic();
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return unlikely(tif_need_resched());
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}
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static inline void __current_clr_polling(void)
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{
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clear_thread_flag(TIF_POLLING_NRFLAG);
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}
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static inline bool __must_check current_clr_polling_and_test(void)
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{
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__current_clr_polling();
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/*
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* Polling state must be visible before we test NEED_RESCHED,
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* paired by resched_curr()
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*/
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smp_mb__after_atomic();
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return unlikely(tif_need_resched());
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}
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#else
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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)
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{
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return unlikely(tif_need_resched());
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}
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static inline bool __must_check current_clr_polling_and_test(void)
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{
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return unlikely(tif_need_resched());
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}
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#endif
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static inline void current_clr_polling(void)
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{
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__current_clr_polling();
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/*
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* Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
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* Once the bit is cleared, we'll get IPIs with every new
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* TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
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* fold.
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*/
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smp_mb(); /* paired with resched_curr() */
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preempt_fold_need_resched();
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}
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#endif /* _LINUX_SCHED_IDLE_H */
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