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/* 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_PREEMPTION extern 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 */