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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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2.4 kB · 100 lines
C
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101/* SPDX-License-Identifier: GPL-2.0 */#ifndef __ASM_PREEMPT_H#define __ASM_PREEMPT_H
#include <linux/thread_info.h>
#define PREEMPT_ENABLED (0)
static __always_inline int preempt_count(void){ return READ_ONCE(current_thread_info()->preempt_count);}
static __always_inline volatile int *preempt_count_ptr(void){ return ¤t_thread_info()->preempt_count;}
static __always_inline void preempt_count_set(int pc){ *preempt_count_ptr() = pc;}
/* * must be macros to avoid header recursion hell */#define init_task_preempt_count(p) do { \ task_thread_info(p)->preempt_count = FORK_PREEMPT_COUNT; \} while (0)
#define init_idle_preempt_count(p, cpu) do { \ task_thread_info(p)->preempt_count = PREEMPT_DISABLED; \} while (0)
static __always_inline void set_preempt_need_resched(void){}
static __always_inline void clear_preempt_need_resched(void){}
static __always_inline bool test_preempt_need_resched(void){ return false;}
/* * The various preempt_count add/sub methods */
static __always_inline void __preempt_count_add(int val){ *preempt_count_ptr() += val;}
static __always_inline void __preempt_count_sub(int val){ *preempt_count_ptr() -= val;}
static __always_inline bool __preempt_count_dec_and_test(void){ /* * Because of load-store architectures cannot do per-cpu atomic * operations; we cannot use PREEMPT_NEED_RESCHED because it might get * lost. */ return !--*preempt_count_ptr() && tif_need_resched();}
/* * Returns true when we need to resched and can (barring IRQ state). */static __always_inline bool should_resched(int preempt_offset){ return unlikely(preempt_count() == preempt_offset && tif_need_resched());}
#ifdef CONFIG_PREEMPTIONextern asmlinkage void preempt_schedule(void);extern asmlinkage void preempt_schedule_notrace(void);
#if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
void dynamic_preempt_schedule(void);void dynamic_preempt_schedule_notrace(void);#define __preempt_schedule() dynamic_preempt_schedule()#define __preempt_schedule_notrace() dynamic_preempt_schedule_notrace()
#else /* !CONFIG_PREEMPT_DYNAMIC || !CONFIG_HAVE_PREEMPT_DYNAMIC_KEY*/
#define __preempt_schedule() preempt_schedule()#define __preempt_schedule_notrace() preempt_schedule_notrace()
#endif /* CONFIG_PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_KEY*/#endif /* CONFIG_PREEMPTION */
#endif /* __ASM_PREEMPT_H */