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| author | Ingo Molnar <mingo@elte.hu> | 2007-07-09 18:51:58 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-07-09 18:51:58 +0200 |
| commit | 4da1ce6d9c7e2a6d9236bf4dcfd33cf506082794 (patch) | |
| tree | 28f1d0b2923900b6c41a60e6c45e50f1b3f15af3 /include/linux/hardirq.h | |
| parent | f64f61145a38f7039e4f1c0b50dcc3fbe70ec28e (diff) | |
| download | lwn-4da1ce6d9c7e2a6d9236bf4dcfd33cf506082794.tar.gz lwn-4da1ce6d9c7e2a6d9236bf4dcfd33cf506082794.zip | |
sched: add in_atomic_preempt_off()
add in_atomic_preempt_off() - debugging helper that will
simplify schedule().
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/hardirq.h')
| -rw-r--r-- | include/linux/hardirq.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index 7803014f3a11..8d302298a161 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -79,6 +79,19 @@ #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) #else |