Merge remote-tracking branch 'rt-stable/v4.4-rt' into linux-linaro-lsk-v4.4-rtlsk-v4.4-18.03-rt

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index db2d81c8cb72..29535116c824 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6202,6 +6202,19 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 		call_rcu_sched(&old_rd->rcu, free_rootdomain);
 }
 
+void sched_get_rd(struct root_domain *rd)
+{
+	atomic_inc(&rd->refcount);
+}
+
+void sched_put_rd(struct root_domain *rd)
+{
+	if (!atomic_dec_and_test(&rd->refcount))
+		return;
+
+	call_rcu_sched(&rd->rcu, free_rootdomain);
+}
+
 static int init_rootdomain(struct root_domain *rd)
 {
 	memset(rd, 0, sizeof(*rd));