From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Wed, 4 Feb 2009 00:01:46 +0000 (-0800)
Subject: xen: disable interrupts before saving in percpu
X-Git-Tag: v2.6.29-rc4~50^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06fc732c33a7ff5e4c91bcf4a6ca86b5e335ad9a;p=pandora-kernel.git

xen: disable interrupts before saving in percpu

Impact: Fix race condition

xen_mc_batch has a small preempt race where it takes the address of a
percpu variable immediately before disabling interrupts, thereby
leaving a small window in which we may migrate to another cpu and save
the flags in the wrong percpu variable.  Disable interrupts before
saving the old flags in a percpu.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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