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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_SCHED_IDLE_H#define _LINUX_SCHED_IDLE_H
#include <linux/sched.h>
enum cpu_idle_type { __CPU_NOT_IDLE = 0, CPU_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
#ifdef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
static __always_inline void __current_set_polling(void){ arch_set_bit(TIF_POLLING_NRFLAG, (unsigned long *)(¤t_thread_info()->flags));}
static __always_inline void __current_clr_polling(void){ arch_clear_bit(TIF_POLLING_NRFLAG, (unsigned long *)(¤t_thread_info()->flags));}
#else
static __always_inline void __current_set_polling(void){ set_bit(TIF_POLLING_NRFLAG, (unsigned long *)(¤t_thread_info()->flags));}
static __always_inline void __current_clr_polling(void){ clear_bit(TIF_POLLING_NRFLAG, (unsigned long *)(¤t_thread_info()->flags));}
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H */
static __always_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());}
static __always_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());}
static __always_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__after_atomic(); /* paired with resched_curr() */
preempt_fold_need_resched();}
#elsestatic inline void __current_set_polling(void) { }static inline void __current_clr_polling(void) { }
static inline bool __must_check current_set_polling_and_test(void){ return unlikely(tif_need_resched());}static inline bool __must_check current_clr_polling_and_test(void){ return unlikely(tif_need_resched());}
static __always_inline void current_clr_polling(void){ __current_clr_polling();
smp_mb(); /* paired with resched_curr() */
preempt_fold_need_resched();}#endif
#endif /* _LINUX_SCHED_IDLE_H */