From 4da1ce6d9c7e2a6d9236bf4dcfd33cf506082794 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 9 Jul 2007 18:51:58 +0200 Subject: sched: add in_atomic_preempt_off() add in_atomic_preempt_off() - debugging helper that will simplify schedule(). Signed-off-by: Ingo Molnar --- include/linux/hardirq.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/linux') 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 @@ -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) -- cgit v1.2.2