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H A Darm-ccn.cdiff 9bcb929f969e4054732158908b1d70e787ef780f Tue Apr 16 17:24:25 CEST 2019 Robin Murphy <robin.murphy@arm.com> perf/arm-ccn: Clean up CPU hotplug handling

Like arm-cci, arm-ccn has the same issue of disabling preemption around
operations which can take mutexes. Again, remove the definite bug by
simply not trying to fight the theoretical races. And since we are
touching the hotplug handling code, take the opportunity to streamline
it, as there's really no need to store a full-sized cpumask to keep
track of a single CPU ID.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>