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perf, powerpc: Handle events that raise an exception without overflowing
Events on POWER7 can roll back if a speculative event doesn't eventually complete. Unfortunately in some rare cases they will raise a performance monitor exception. We need to catch this to ensure we reset the PMC. In all cases the PMC will be 256 or less cycles from overflow. Signed-off-by: Anton Blanchard <firstname.lastname@example.org> Signed-off-by: Peter Zijlstra <email@example.com> Cc: <firstname.lastname@example.org> # as far back as it applies cleanly LKML-Reference: <20110309143842.6c22845e@kryten> Signed-off-by: Ingo Molnar <email@example.com>
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