linux-kernel - [PATCH] perf_event: Fix preempt warning in perf

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Date:	Fri, 26 Feb 2010 16:36:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	tglx <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf_event: Fix preempt warning in perf_clock()


A recent commit introduced a preemption warning for perf_clock(), use
raw_smp_processor_id() to avoid this, it really doesn't matter which cpu
we use here.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: stable@...nel.org
LKML-Reference: <new-submission>
---
Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -249,7 +249,7 @@ static void perf_unpin_context(struct pe
 
 static inline u64 perf_clock(void)
 {
-	return cpu_clock(smp_processor_id());
+	return cpu_clock(raw_smp_processor_id());
 }
 
 /*


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