linux-kernel - [tip:perf/urgent] perf, x86: Fixup the precise

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Message-ID: <tip-5553be2620ac901c21a25657bd5b59f73254e6d5@git.kernel.org>
Date:	Fri, 22 Oct 2010 13:03:40 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perf/urgent] perf, x86: Fixup the precise_ip computation

Commit-ID:  5553be2620ac901c21a25657bd5b59f73254e6d5
Gitweb:     http://git.kernel.org/tip/5553be2620ac901c21a25657bd5b59f73254e6d5
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Tue, 19 Oct 2010 14:38:11 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 22 Oct 2010 14:18:25 +0200

perf, x86: Fixup the precise_ip computation

In case we don't have PEBS, the LBR fixup doesn't make sense.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Acked-by: Stephane Eranian <eranian@...gle.com>
LKML-Reference: <20101019134808.354429461@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/cpu/perf_event.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index fe73c18..f369c53 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -497,12 +497,13 @@ static int x86_pmu_hw_config(struct perf_event *event)
 		int precise = 0;
 
 		/* Support for constant skid */
-		if (x86_pmu.pebs)
+		if (x86_pmu.pebs) {
 			precise++;
 
-		/* Support for IP fixup */
-		if (x86_pmu.lbr_nr)
-			precise++;
+			/* Support for IP fixup */
+			if (x86_pmu.lbr_nr)
+				precise++;
+		}
 
 		if (event->attr.precise_ip > precise)
 			return -EOPNOTSUPP;
--
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