From: Anton Blanchard <anton@samba.org>
Date: Wed, 9 Mar 2011 03:38:42 +0000 (+1100)
Subject: perf, powerpc: Handle events that raise an exception without overflowing
X-Git-Tag: v2.6.37.5~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d36135722758275db3a6a1f3ba4b26d2c1cd4946;p=pandora-kernel.git

perf, powerpc: Handle events that raise an exception without overflowing

commit 0837e3242c73566fc1c0196b4ec61779c25ffc93 upstream.

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 <anton@samba.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110309143842.6c22845e@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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