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#ifndef __LINUX_PREEMPT_H
#define __LINUX_PREEMPT_H

/*
 * include/linux/preempt.h - macros for accessing and manipulating
 * preempt_count (used for kernel preemption, interrupt count, etc.)
 */


#include <linux/config.h>

#define preempt_count() (current_thread_info()->preempt_count)

#define inc_preempt_count() \
do { \
        preempt_count()++; \
} while (0)


#define dec_preempt_count() \
do { \
        preempt_count()--; \
} while (0)


#ifdef CONFIG_PREEMPT

extern void preempt_schedule(void);

#define preempt_disable() \
do { \
        inc_preempt_count(); \
        barrier(); \
} while (0)


#define preempt_enable_no_resched() \
do { \
        barrier(); \
        dec_preempt_count(); \
} while (0)


#define preempt_check_resched() \
do { \
        if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
                preempt_schedule(); \
} while (0)


#define preempt_enable() \
do { \
        preempt_enable_no_resched(); \
        preempt_check_resched(); \
} while (0)


#else

#define preempt_disable()               do { } while (0)
#define preempt_enable_no_resched()     do { } while (0)
#define preempt_enable()                do { } while (0)
#define preempt_check_resched()         do { } while (0)

#endif

#endif /* __LINUX_PREEMPT_H */