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From 51d40b2ded3c8a08efce4376ad85b1a1988ac86e Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 7 Jun 2011 11:25:03 +0200
Subject: [PATCH 129/270] sched-cond-resched.patch
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched/core.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index eb9ff52..e7bd476 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4691,9 +4691,17 @@ static inline int should_resched(void)
static void __cond_resched(void)
{
- add_preempt_count(PREEMPT_ACTIVE);
- __schedule();
- sub_preempt_count(PREEMPT_ACTIVE);
+ do {
+ add_preempt_count(PREEMPT_ACTIVE);
+ __schedule();
+ sub_preempt_count(PREEMPT_ACTIVE);
+ /*
+ * Check again in case we missed a preemption
+ * opportunity between schedule and now.
+ */
+ barrier();
+
+ } while (need_resched());
}
int __sched _cond_resched(void)
--
1.7.10.4
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