linux-kernel - [PATCH] ftrace: move pc counter in irqstrace

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Date:	Thu, 2 Oct 2008 19:23:04 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] ftrace: move pc counter in irqstrace


The assigning of the pc counter is in the wrong spot in the
check_critical_timing function. The pc variable is used in the
out jump.

Signed-off-by: Steven Rostedt <srostedt@...hat.com>
---
 kernel/trace/trace_irqsoff.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-tip.git/kernel/trace/trace_irqsoff.c
===================================================================
--- linux-tip.git.orig/kernel/trace/trace_irqsoff.c	2008-10-02 09:07:16.000000000 -0400
+++ linux-tip.git/kernel/trace/trace_irqsoff.c	2008-10-02 14:16:54.000000000 -0400
@@ -142,11 +142,11 @@ check_critical_timing(struct trace_array
 
 	local_save_flags(flags);
 
+	pc = preempt_count();
+
 	if (!report_latency(delta))
 		goto out;
 
-	pc = preempt_count();
-
 	spin_lock_irqsave(&max_trace_lock, flags);
 
 	/* check if we are still the max latency */

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