From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: [PATCH RT 2/2] ftrace: fix elevated preempt_count in wakeup-tracer Date: Tue, 19 Aug 2008 05:19:23 -0400 Message-ID: <20080819091923.21725.41087.stgit@dev.haskins.net> References: <20080819091817.21725.81831.stgit@dev.haskins.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: ghaskins@novell.com, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org To: mingo@elte.hu, rostedt@goodmis.org, tglx@linutronix.de Return-path: Received: from 75-130-108-43.dhcp.oxfr.ma.charter.com ([75.130.108.43]:44361 "EHLO dev.haskins.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753543AbYHSJVg (ORCPT ); Tue, 19 Aug 2008 05:21:36 -0400 In-Reply-To: <20080819091817.21725.81831.stgit@dev.haskins.net> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Suggested by Steve Rostedt to fix an observed "+1" in the preempt-count Signed-off-by: Gregory Haskins --- 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);