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422 giacomo 1
#ifndef __LINUX_PREEMPT_H
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#define __LINUX_PREEMPT_H
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/*
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 * include/linux/preempt.h - macros for accessing and manipulating
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 * preempt_count (used for kernel preemption, interrupt count, etc.)
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 */
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#include <linux/config.h>
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#define preempt_count() (current_thread_info()->preempt_count)
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#define inc_preempt_count() \
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do { \
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        preempt_count()++; \
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} while (0)
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#define dec_preempt_count() \
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do { \
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        preempt_count()--; \
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} while (0)
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#ifdef CONFIG_PREEMPT
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extern void preempt_schedule(void);
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#define preempt_disable() \
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do { \
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        inc_preempt_count(); \
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        barrier(); \
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} while (0)
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#define preempt_enable_no_resched() \
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do { \
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        barrier(); \
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        dec_preempt_count(); \
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} while (0)
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#define preempt_check_resched() \
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do { \
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        if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
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                preempt_schedule(); \
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} while (0)
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#define preempt_enable() \
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do { \
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        preempt_enable_no_resched(); \
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        preempt_check_resched(); \
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} while (0)
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#else
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#define preempt_disable()               do { } while (0)
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#define preempt_enable_no_resched()     do { } while (0)
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#define preempt_enable()                do { } while (0)
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#define preempt_check_resched()         do { } while (0)
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#endif
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#endif /* __LINUX_PREEMPT_H */