This is a note to let you know that I've just added the patch titled
perf/rapl: Fix crash in rapl_scale()
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-rapl-fix-crash-in-rapl_scale.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 98b008dff8452653909d9263efda925873e8d8bb Mon Sep 17 00:00:00 2001
From: Stephane Eranian <[email protected]>
Date: Thu, 22 Jan 2015 21:38:34 +0100
Subject: perf/rapl: Fix crash in rapl_scale()
From: Stephane Eranian <[email protected]>
commit 98b008dff8452653909d9263efda925873e8d8bb upstream.
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 <[email protected]>
Tested-by: Vince Weaver <[email protected]>
Fixes: 89cbc76768c2 ("x86: Replace __get_cpu_var uses")
Signed-off-by: Stephane Eranian <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: [email protected]
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/20150122203834.GA10228@thinkpad
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -135,7 +135,7 @@ 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)
Patches currently in stable-queue which might be from [email protected] are
queue-3.18/perf-rapl-fix-crash-in-rapl_scale.patch
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