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Linux/include/linux/sched/idle.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_SCHED_IDLE_H
  3 #define _LINUX_SCHED_IDLE_H
  4 
  5 #include <linux/sched.h>
  6 
  7 enum cpu_idle_type {
  8         CPU_IDLE,
  9         CPU_NOT_IDLE,
 10         CPU_NEWLY_IDLE,
 11         CPU_MAX_IDLE_TYPES
 12 };
 13 
 14 extern void wake_up_if_idle(int cpu);
 15 
 16 /*
 17  * Idle thread specific functions to determine the need_resched
 18  * polling state.
 19  */
 20 #ifdef TIF_POLLING_NRFLAG
 21 
 22 static inline void __current_set_polling(void)
 23 {
 24         set_thread_flag(TIF_POLLING_NRFLAG);
 25 }
 26 
 27 static inline bool __must_check current_set_polling_and_test(void)
 28 {
 29         __current_set_polling();
 30 
 31         /*
 32          * Polling state must be visible before we test NEED_RESCHED,
 33          * paired by resched_curr()
 34          */
 35         smp_mb__after_atomic();
 36 
 37         return unlikely(tif_need_resched());
 38 }
 39 
 40 static inline void __current_clr_polling(void)
 41 {
 42         clear_thread_flag(TIF_POLLING_NRFLAG);
 43 }
 44 
 45 static inline bool __must_check current_clr_polling_and_test(void)
 46 {
 47         __current_clr_polling();
 48 
 49         /*
 50          * Polling state must be visible before we test NEED_RESCHED,
 51          * paired by resched_curr()
 52          */
 53         smp_mb__after_atomic();
 54 
 55         return unlikely(tif_need_resched());
 56 }
 57 
 58 #else
 59 static inline void __current_set_polling(void) { }
 60 static inline void __current_clr_polling(void) { }
 61 
 62 static inline bool __must_check current_set_polling_and_test(void)
 63 {
 64         return unlikely(tif_need_resched());
 65 }
 66 static inline bool __must_check current_clr_polling_and_test(void)
 67 {
 68         return unlikely(tif_need_resched());
 69 }
 70 #endif
 71 
 72 static inline void current_clr_polling(void)
 73 {
 74         __current_clr_polling();
 75 
 76         /*
 77          * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
 78          * Once the bit is cleared, we'll get IPIs with every new
 79          * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
 80          * fold.
 81          */
 82         smp_mb(); /* paired with resched_curr() */
 83 
 84         preempt_fold_need_resched();
 85 }
 86 
 87 #endif /* _LINUX_SCHED_IDLE_H */
 88 

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