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authorFrederic Weisbecker <fweisbec@gmail.com>2011-06-08 01:13:27 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2011-06-10 15:15:40 +0200
commitbdd4e85dc36cdbcfc1608a5b2a17c80a9db8986a (patch)
tree9cee98e78a5aa6a00f3b7ce805b1e39a0137b4a4 /include/linux/hardirq.h
parent2da8c8bc44b572cbf623629ff736608dc7968436 (diff)
downloadlwn-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.h4
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