linux-kernel - [tip:perf/urgent] perf/rapl: Fix crash in rapl

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Message-ID: <tip-98b008dff8452653909d9263efda925873e8d8bb@git.kernel.org>
Date:	Wed, 28 Jan 2015 06:29:02 -0800
From:	tip-bot for Stephane Eranian <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	peterz@...radead.org, eranian@...gle.com,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	tglx@...utronix.de, acme@...nel.org, vincent.weaver@...ne.edu,
	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf/rapl: Fix crash in rapl_scale()

Commit-ID:  98b008dff8452653909d9263efda925873e8d8bb
Gitweb:     http://git.kernel.org/tip/98b008dff8452653909d9263efda925873e8d8bb
Author:     Stephane Eranian <eranian@...gle.com>
AuthorDate: Thu, 22 Jan 2015 21:38:34 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 28 Jan 2015 13:04:35 +0100

perf/rapl: Fix crash in rapl_scale()

This patch fixes a systematic crash in rapl_scale()
due to an invalid pointer.

The bug was introduced by commit:

  89cbc76768c2 ("x86: Replace __get_cpu_var uses")

The fix is simple. Just put the parenthesis where it needs
to be, i.e., around rapl_pmu. To my surprise, the compiler
was not complaining about passing an integer instead of a
pointer.

Reported-by: Vince Weaver <vincent.weaver@...ne.edu>
Tested-by: Vince Weaver <vincent.weaver@...ne.edu>
Fixes: 89cbc76768c2 ("x86: Replace __get_cpu_var uses")
Signed-off-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: cl@...ux.com
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20150122203834.GA10228@thinkpad
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event_intel_rapl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index 6e434f8..c4bb8b8 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -142,7 +142,7 @@ static inline u64 rapl_scale(u64 v)
 	 * or use ldexp(count, -32).
 	 * Watts = Joules/Time delta
 	 */
-	return v << (32 - __this_cpu_read(rapl_pmu->hw_unit));
+	return v << (32 - __this_cpu_read(rapl_pmu)->hw_unit);
 }
 
 static u64 rapl_event_update(struct perf_event *event)
--
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