sched/deadline: Prevent rt_time growth to infinity

[~andy/linux] / kernel / sched / rt.c

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index a2740b775b456ed27c56ad088007c83e1873458b..1999021042c7010c6e5e86539b9c0b9a03519dcd 100644 (file)
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -538,6 +538,14 @@ static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
 
 #endif /* CONFIG_RT_GROUP_SCHED */
 
+bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
+{
+       struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
+
+       return (hrtimer_active(&rt_b->rt_period_timer) ||
+               rt_rq->rt_time < rt_b->rt_runtime);
+}
+
 #ifdef CONFIG_SMP
 /*
  * We ran out of runtime, see if we can borrow some from our neighbours.