tree ca92a63aa1499981c30fccb63db1270596af2aad
parent 436d03faf6961b30e13b2d0967aea9d772d6cf44
author Peter Zijlstra <peterz@infradead.org> 1338903031 +0200
committer Ingo Molnar <mingo@kernel.org> 1338994784 +0200

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>