From: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
Date: Sat, 7 Feb 2009 00:52:05 +0000 (-0800)
Subject: x86: add clflush before monitor for Intel 7400 series
X-Git-Tag: v2.6.29-rc5~34^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e736ad548db152776de61d7a26805cfae77ce5ce;p=pandora-kernel.git

x86: add clflush before monitor for Intel 7400 series

For Intel 7400 series CPUs, the recommendation is to use a clflush on the
monitored address just before monitor and mwait pair [1].

This clflush makes sure that there are no false wakeups from mwait when the
monitored address was recently written to.

[1] "MONITOR/MWAIT Recommendations for Intel Xeon Processor 7400 series"
    section in specification update document of 7400 series
    http://download.intel.com/design/xeon/specupdt/32033601.pdf

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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