From: H. Peter Anvin <hpa@linux.intel.com>
Date: Mon, 20 Sep 2010 20:04:45 +0000 (-0700)
Subject: x86, hotplug: In the MWAIT case of play_dead, CLFLUSH the cache line
X-Git-Tag: v2.6.37-rc1~205^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce5f68246bf2385d6174856708d0b746dc378f20;p=pandora-kernel.git

x86, hotplug: In the MWAIT case of play_dead, CLFLUSH the cache line

When we're using MWAIT for play_dead, explicitly CLFLUSH the cache
line before executing MONITOR.  This is a potential workaround for the
Xeon 7400 erratum AAI65 after having a spurious wakeup and returning
around the loop.  "Potential" here because it is not certain that that
erratum could actually trigger; however, the CLFLUSH should be
harmless.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Acked-by: Venkatesh Pallipadi <venki@google.com>
Cc: Asit Mallick <asit.k.mallick@intel.com>
Cc: Arjan van de Ven <arjan@linux.kernel.org>
Cc: Len Brown <lenb@kernel.org>
---

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