From: Punit Agrawal <punit.agrawal@arm.com>
Date: Mon, 1 Sep 2014 16:16:01 +0000 (+0100)
Subject: ARM: 8135/1: Fix in-correct barrier usage in SWP{B} emulation
X-Git-Tag: fixes-for-v3.18-merge-window~94^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e918a62a2ba81d10a3cc2c513dc70034c9524a95;p=pandora-kernel.git

ARM: 8135/1: Fix in-correct barrier usage in SWP{B} emulation

According to the ARM ARMv7, explicit barriers are necessary when using
synchronisation primitives such as SWP{B}. The use of these
instructions does not automatically imply a barrier and any ordering
requirements by the software must be explicitly expressed with the use
of suitable barriers.

Based on this, remove the barriers from SWP{B} emulation.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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