Release 4.7 include/asm-generic/preempt.h

#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);
}

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static __always_inline volatile int *preempt_count_ptr(void)
{
	return &current_thread_info()->preempt_count;
}

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static __always_inline void preempt_count_set(int pc)
{
	*preempt_count_ptr() = pc;
}

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/*
 * 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_ENABLED; \
} while (0)



static __always_inline void set_preempt_need_resched(void)
{
}

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static __always_inline void clear_preempt_need_resched(void)
{
}

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static __always_inline bool test_preempt_need_resched(void)
{
	return false;
}

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/*
 * The various preempt_count add/sub methods
 */



static __always_inline void __preempt_count_add(int val)
{
	*preempt_count_ptr() += val;
}

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static __always_inline void __preempt_count_sub(int val)
{
	*preempt_count_ptr() -= val;
}

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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();
}

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/*
 * 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());
}

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#ifdef CONFIG_PREEMPT
extern asmlinkage void preempt_schedule(void);

#define __preempt_schedule() preempt_schedule()
extern asmlinkage void preempt_schedule_notrace(void);

#define __preempt_schedule_notrace() preempt_schedule_notrace()
#endif /* CONFIG_PREEMPT */

#endif /* __ASM_PREEMPT_H */
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Directory: include/asm-generic

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