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perf: disable events across cpu hotplug.
Enabling events across cpu hotplug can cause kernel panic, one situation is like below: -> enable perf event on one cpu -> the cpu is offlined -> the perf event is released, but failed to bring up the cpu. so the event is freed, but still registered in the pmu. -> the cpu is online, and try to access the freed event. Bug: 28964480 Change-Id: I395091af177b3307d7b4c3236c2e4b249b06c053
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