From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 2 Oct 2012 13:41:23 +0000 (+0200)
Subject: perf: Fix perf_cgroup_switch for sw-events
X-Git-Tag: v3.2.52~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49a58f5fa9d71155be5b6211030c281084f336a3;p=pandora-kernel.git

perf: Fix perf_cgroup_switch for sw-events

commit 95cf59ea72331d0093010543b8951bb43f262cac upstream.

Jiri reported that he could trigger the WARN_ON_ONCE() in
perf_cgroup_switch() using sw-events. This is because sw-events share
a cpuctx with multiple PMUs.

Use the ->unique_pmu pointer to limit the pmu iteration to unique
cpuctx instances.

Reported-and-Tested-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-so7wi2zf3jjzrwcutm2mkz0j@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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