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sched: add in_atomic_preempt_off()

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add in_atomic_preempt_off() - debugging helper that will
simplify schedule().

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-07-09 18:51:58 +02:00
parent f64f61145a
commit 4da1ce6d9c
1 changed files with 13 additions and 0 deletions
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13
include/linux/hardirq.h
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@ -78,6 +78,19 @@
# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
#endif
#ifdef CONFIG_PREEMPT
# define PREEMPT_CHECK_OFFSET 1
#else
# define PREEMPT_CHECK_OFFSET 0
#endif
/*
* Check whether we were atomic before we did preempt_disable():
* (used by the scheduler)
*/
#define in_atomic_preempt_off() \
((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET)
#ifdef CONFIG_PREEMPT
# define preemptible() (preempt_count() == 0 && !irqs_disabled())
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)