From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 12 Oct 2012 15:59:46 +0000 (+0100)
Subject: dm: use ACCESS_ONCE for sysfs values
X-Git-Tag: v3.7-rc1~21^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe5fe90639b62a75349dd1f1c74c4a984397171c;p=pandora-kernel.git

dm: use ACCESS_ONCE for sysfs values

Use the ACCESS_ONCE macro in dm-bufio and dm-verity where a variable
can be modified asynchronously (through sysfs) and we want to prevent
compiler optimizations that assume that the variable hasn't changed.
(See Documentation/atomic_ops.txt.)

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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