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Commit f1679d08 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched: fix rt-bandwidth hotplug race 



When we hot-unplug a cpu and rebuild the sched-domain, all cpus will be
detatched. Alex observed the case where a runqueue was stealing bandwidth
from an already disabled runqueue to satisfy its own needs.

Stop this by skipping over already disabled runqueues.

Reported-by: default avatarAlex Nixon <alex.nixon@citrix.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: default avatarAlex Nixon <alex.nixon@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 09f2724a

kernel/sched_rt.c

+1 −1
Original line number Diff line number Diff line
@@ -298,7 +298,7 @@ static void __disable_runtime(struct rq *rq) 
			struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);

			s64 diff;



			if (iter == rt_rq)

			if (iter == rt_rq || iter->rt_runtime == RUNTIME_INF)

				continue;



			spin_lock(&iter->rt_runtime_lock);