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authorThomas Gleixner <tglx@linutronix.de>2011-11-13 17:17:09 +0100
committerClark Williams <williams@redhat.com>2012-04-13 11:01:53 -0500
commit83b72f185a46187c721ec38b6bff0acf56c6713d (patch)
tree6f1f5217e7578f68ac73b87820cf9181165667b5 /include
parent42ed5c60fff3db8cd105dc8020bf88ed231813bb (diff)
softirq: Check preemption after reenabling interrupts
raise_softirq_irqoff() disables interrupts and wakes the softirq daemon, but after reenabling interrupts there is no preemption check, so the execution of the softirq thread might be delayed arbitrarily. In principle we could add that check to local_irq_enable/restore, but that's overkill as the rasie_softirq_irqoff() sections are the only ones which show this behaviour. Reported-by: Carsten Emde <cbe@osadl.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'include')
-rw-r--r--include/linux/preempt.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 5af46d09b3fe..5e712854fc8d 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -56,8 +56,10 @@ do { \
#ifndef CONFIG_PREEMPT_RT_BASE
# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+# define preempt_check_resched_rt() do { } while (0)
#else
# define preempt_enable_no_resched() preempt_enable()
+# define preempt_check_resched_rt() preempt_check_resched()
#endif
#define preempt_enable() \
@@ -105,6 +107,7 @@ do { \
#define preempt_disable_notrace() do { } while (0)
#define preempt_enable_no_resched_notrace() do { } while (0)
#define preempt_enable_notrace() do { } while (0)
+#define preempt_check_resched_rt() do { } while (0)
#endif /* CONFIG_PREEMPT_COUNT */