diff options
| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-06-08 01:13:27 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2011-06-10 15:15:40 +0200 |
| commit | bdd4e85dc36cdbcfc1608a5b2a17c80a9db8986a (patch) | |
| tree | 9cee98e78a5aa6a00f3b7ce805b1e39a0137b4a4 /include/linux/hardirq.h | |
| parent | 2da8c8bc44b572cbf623629ff736608dc7968436 (diff) | |
| download | lwn-bdd4e85dc36cdbcfc1608a5b2a17c80a9db8986a.tar.gz lwn-bdd4e85dc36cdbcfc1608a5b2a17c80a9db8986a.zip | |
sched: Isolate preempt counting in its own config option
Create a new CONFIG_PREEMPT_COUNT that handles the inc/dec
of preempt count offset independently. So that the offset
can be updated by preempt_disable() and preempt_enable()
even without the need for CONFIG_PREEMPT beeing set.
This prepares to make CONFIG_DEBUG_SPINLOCK_SLEEP working
with !CONFIG_PREEMPT where it currently doesn't detect
code that sleeps inside explicit preemption disabled
sections.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'include/linux/hardirq.h')
| -rw-r--r-- | include/linux/hardirq.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index ba362171e8ae..f743883f769e 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h @@ -93,7 +93,7 @@ */ #define in_nmi() (preempt_count() & NMI_MASK) -#if defined(CONFIG_PREEMPT) +#if defined(CONFIG_PREEMPT_COUNT) # define PREEMPT_CHECK_OFFSET 1 #else # define PREEMPT_CHECK_OFFSET 0 @@ -115,7 +115,7 @@ #define in_atomic_preempt_off() \ ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) -#ifdef CONFIG_PREEMPT +#ifdef CONFIG_PREEMPT_COUNT # define preemptible() (preempt_count() == 0 && !irqs_disabled()) # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1) #else |