* Tiejun Chen | 2013-11-07 10:06:07 [+0800]: >Commit 08c1ab68, "hotplug-use-migrate-disable.patch", intends to >use migrate_enable()/migrate_disable() to replace that combination >of preempt_enable() and preempt_disable(), but actually in >!CONFIG_PREEMPT_RT_FULL case, migrate_enable()/migrate_disable() >are still equal to preempt_enable()/preempt_disable(). So that >followed cpu_hotplug_begin()/cpu_unplug_begin(cpu) would go schedule() >to trigger schedule_debug() like this: > >_cpu_down() > | > + migrate_disable() = preempt_disable() > | > + cpu_hotplug_begin() or cpu_unplug_begin() > | > + schedule() > | > + __schedule() > | > + preempt_disable(); > | > + __schedule_bug() is true! > >So we should move migrate_enable() as the original scheme. > >Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxxxxxx> applied. Sebastian -- To unsubscribe from this list: send the line "unsubscribe stable-rt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
