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Make sure that we have access to the performance counters and that they aren't being used by perf events or anything else. Cc: Will Deacon <will.deacon@arm.com> Cc: Jean Pihet <jpihet@mvista.com> Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>