On Tue, 26 Jul 2011, Yong Zhang wrote: > 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 > */ Rightfully so. The caller will just block on the cpu_hotplug.lock mutex until the unplug operation will be done. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
