From 195b58add463f697fb802ed55e26759094d40a54 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Thu, 28 Aug 2014 13:08:14 +0100
Subject: [PATCH] ARM: Avoid writing to control register on every exception

If we are not changing the control register value, avoid writing to it.
Writes to the control register can be very expensive, taking around a
hundred cycles or so.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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