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87 lines
1.8 KiB
87 lines
1.8 KiB
/* 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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