From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Fri, 21 Nov 2014 15:29:40 +0000 (+0100)
Subject: x86/gup: Replace ACCESS_ONCE with READ_ONCE
X-Git-Tag: omap-for-v3.19/fixes-rc1~8^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14cf3d977b80f5e355f8ac7547cf1b9ff9fb3e09;p=pandora-kernel.git

x86/gup: Replace ACCESS_ONCE with READ_ONCE

ACCESS_ONCE does not work reliably on non-scalar types. For
example gcc 4.6 and 4.7 might remove the volatile tag for such
accesses during the SRA (scalar replacement of aggregates) step
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)

Change the gup code to replace ACCESS_ONCE with READ_ONCE.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

Reading git-diff-tree failed