From: David Vrabel <david.vrabel@citrix.com>
Date: Wed, 11 Sep 2013 17:45:44 +0000 (+0000)
Subject: xen/balloon: ensure preemption is disabled when using a scratch page
X-Git-Tag: v3.12-rc1~34^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2bad07ce28a0f61c1e776f99aa05f85e4e689e24;p=pandora-kernel.git

xen/balloon: ensure preemption is disabled when using a scratch page

In decrease_reservation(), if the kernel is preempted between updating
the mapping and updating the p2m then they may end up using different
scratch pages.

Use get_balloon_scratch_page() and put_balloon_scratch_page() which use
get_cpu_var() and put_cpu_var() to correctly disable preemption.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Sander Eikelenboom <linux@eikelenboom.it>
---

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