This is a note to let you know that I've just added the patch titled
ARM: 7698/1: perf: fix group validation when using enable_on_exec
to the 3.4-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:
arm-7698-1-perf-fix-group-validation-when-using-enable_on_exec.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cb2d8b342aa084d1f3ac29966245dec9163677fb Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@xxxxxxx>
Date: Fri, 12 Apr 2013 19:04:19 +0100
Subject: ARM: 7698/1: perf: fix group validation when using enable_on_exec
From: Will Deacon <will.deacon@xxxxxxx>
commit cb2d8b342aa084d1f3ac29966245dec9163677fb upstream.
Events may be created with attr->disabled == 1 and attr->enable_on_exec
== 1, which confuses the group validation code because events with the
PERF_EVENT_STATE_OFF are not considered candidates for scheduling, which
may lead to failure at group scheduling time.
This patch fixes the validation check for ARM, so that events in the
OFF state are still considered when enable_on_exec is true.
Reported-by: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/perf_event.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -319,7 +319,10 @@ validate_event(struct pmu_hw_events *hw_
struct hw_perf_event fake_event = event->hw;
struct pmu *leader_pmu = event->group_leader->pmu;
- if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF)
+ if (event->pmu != leader_pmu || event->state < PERF_EVENT_STATE_OFF)
+ return 1;
+
+ if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
return 1;
return armpmu->get_event_idx(hw_events, &fake_event) >= 0;
Patches currently in stable-queue which might be from will.deacon@xxxxxxx are
queue-3.4/arm-7698-1-perf-fix-group-validation-when-using-enable_on_exec.patch
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