migrate_disable() race with cpu hotplug?

[Yong Zhang]

When reading the code, I'm afraid there is a race between migrate_disable()
and cpu hotplug. A scenario will like below:

	CPU0			CPU1
_cpu_down();
  cpu_unplug_begin();
    wait_for_completion()
  			sync_unplug_thread();
			  complete();
			race_window? /*
				      * migrate_disable() will
				      * not take effect since
				      * hotplug is in progress
				      */

  __stop_machine();

I think it could happen but maybe I'm missing something.

Thanks,
Yong


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