From: Juergen Gross <jgross@suse.com>
Date: Mon, 12 Jan 2015 05:05:08 +0000 (+0100)
Subject: xen: correct race in alloc_p2m_pmd()
X-Git-Tag: fixes-v4.0-rc1~304^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f241b0b891c903da2465b7a98eaf650784e666da;p=pandora-kernel.git

xen: correct race in alloc_p2m_pmd()

When allocating a new pmd for the linear mapped p2m list a check is
done for not introducing another pmd when this just happened on
another cpu. In this case the old pte pointer was returned which
points to the p2m_missing or p2m_identity page. The correct value
would be the pointer to the found new page.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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