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3e51f893de
Pull CPU hotplug fix from Thomas Gleixner: "A single fix preventing the concurrent execution of the CPU hotplug callback install/invocation machinery. Long standing bug caused by a massive brain slip of that Gleixner dude, which went unnoticed for almost a year" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: cpu/hotplug: Serialize callback invocations proper