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Date:	Tue, 7 Oct 2014 21:51:08 +0200
From:	Oleg Nesterov <>
To:	Ingo Molnar <>,
	Peter Zijlstra <>
Cc:	Steven Rostedt <>,
Subject: [PATCH 1/1] sched: fix the PREEMPT_ACTIVE check in

task_preempt_count() has nothing to do with the actual preempt counter,
thread_info->saved_preempt_count is only valid right after switch_to().

__trace_sched_switch_state() can use preempt_count(), prev is still the
current task when trace_sched_switch() is called.

Signed-off-by: Oleg Nesterov <>
 include/trace/events/sched.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 0a68d5a..a7d67bc 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -100,7 +100,7 @@ static inline long __trace_sched_switch_state(struct task_struct *p)
 	 * For all intents and purposes a preempted task is a running task.
-	if (task_preempt_count(p) & PREEMPT_ACTIVE)
+	if (preempt_count() & PREEMPT_ACTIVE)

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