Russell King 195b58add4 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>

2014-09-26 14:39:54 +01:00

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