From: Michael Ellerman <mpe@ellerman.id.au>
Date: Fri, 14 Mar 2014 05:00:29 +0000 (+1100)
Subject: powerpc/perf: Add lost exception workaround
X-Git-Tag: v3.15-rc1~124^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c2e37a2626a7471875f3a6452b99dfd3809972b9;p=pandora-kernel.git

powerpc/perf: Add lost exception workaround

Some power8 revisions have a hardware bug where we can lose a PMU
exception, this commit adds a workaround to detect the bad condition and
rectify the situation.

See the comment in the commit for a full description.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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