From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 5 Jun 2012 13:30:31 +0000 (+0200)
Subject: perf/x86: Fix Intel shared extra MSR allocation
X-Git-Tag: v3.5-rc2~10^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b430f7c4706aeba4270c7ab7744fc504b9315e1c;p=pandora-kernel.git

perf/x86: Fix Intel shared extra MSR allocation

Zheng Yan reported that event group validation can wreck event state
when Intel extra_reg allocation changes event state.

Validation shouldn't change any persistent state. Cloning events in
validate_{event,group}() isn't really pretty either, so add a few
special cases to avoid modifying the event state.

The code is restructured to minimize the special case impact.

Reported-by: Zheng Yan <zheng.z.yan@linux.intel.com>
Acked-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338903031.28282.175.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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