From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH 0/3] per_cpu() fixes
Date: Thu, 26 Sep 2013 10:49:23 +0100
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Cc: Keir Fraser <keir@xen.org>, Ian Campbell <Ian.Campbell@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>, Jan Beulich <JBeulich@suse.com>
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This patch series is two independent but related changes to the use of
per_cpu() with offline pcpus.

The first patch is a fix for use of get_cpu_idle_time() whereby toolstack
hypercalls could cause an effective NULL structure dereference.

The second patch is a forward looking fix to try and prevent similar issues in
the future.  It causes uses of per_cpu() against an offline pcpu to cause a
#GF rather than to try and dereference a very low address.

The third patch is debugging code to demonstrate the effects of patch 2.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Keir Fraser <keir@xen.org>
CC: Jan Beulich <JBeulich@suse.com>
CC: Tim Deegan <tim@xen.org>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>

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