[PATCH 1/6] arm: Fix in-correct barrier usage in SWP{B} emulation

Catalin Marinas [off-list ref] writes:

On Tue, Aug 26, 2014 at 11:28:45AM +0100, Punit Agrawal wrote:

quoted

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.

Cc: Russell King <redacted>
Signed-off-by: Punit Agrawal <redacted>

This patch is independent to the SWP emulation for arm64 series. Unless
Russell has any objections, you should send it to his patch system (git
send-email to patches at arm.linux.org.uk with "KernelVersion: v3..." after
the commit log; I hope Russell drops the KernelVersion requirement some
day ;)).

OK. Unless I hear any objections, I'll send the patch to Russell's
system tomorrow.