linux-kernel - [PATCH RT 2/2] ftrace: fix elevated preempt

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Date:	Tue, 19 Aug 2008 05:19:23 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, rostedt@...dmis.org, tglx@...utronix.de
Cc:	ghaskins@...ell.com, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: [PATCH RT 2/2] ftrace: fix elevated preempt_count in wakeup-tracer

Suggested by Steve Rostedt to fix an observed "+1" in the preempt-count

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/trace/trace_sched_wakeup.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index c3a15bd..ae523fd 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -70,7 +70,9 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
 	if (task_cpu(wakeup_task) != cpu)
 		goto unlock;
 
+	preempt_enable_no_resched_notrace();
 	trace_function(tr, data, ip, parent_ip, flags);
+	preempt_disable_notrace();
 
  unlock:
 	__raw_spin_unlock(&wakeup_lock);

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