From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Date: Mon, 15 Dec 2008 06:26:48 +0000 (+0530)
Subject: sched: use RCU variant of list traversal in for_each_leaf_rt_rq()
X-Git-Tag: upstream/snapshot3+hdmi~21173^2^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80f40ee4a07530cc3acbc239a9299ec47025825b;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

sched: use RCU variant of list traversal in for_each_leaf_rt_rq()

Impact: fix potential of rare crash

for_each_leaf_rt_rq() walks an RCU protected list (rq->leaf_rt_rq_list),
but doesn't use list_for_each_entry_rcu(). Fix this.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index d9ba9d5..7bdf84c 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -77,7 +77,7 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
-	list_for_each_entry(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
+	list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
 
 static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
 {