From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 26 Jan 2011 14:38:35 +0000 (+0100)
Subject: perf: Fix reading in perf_event_read()
X-Git-Tag: v2.6.38-rc4~25^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=542e72fc90f5ed9eecb574f80f70868c7f296093;p=pandora-kernel.git

perf: Fix reading in perf_event_read()

It is quite possible for the event to have been disabled between
perf_event_read() sending the IPI and the CPU servicing the IPI and
calling __perf_event_read(), hence revalidate the state.

Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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