From 66339c31bc3978d5fff9c4b4cb590a861def4db2 Mon Sep 17 00:00:00 2001
From: Kirill Tkhai <ktkhai@parallels.com>
Date: Mon, 22 Sep 2014 22:36:24 +0400
Subject: [PATCH] sched: Use dl_bw_of() under RCU read lock

dl_bw_of() dereferences rq->rd which has to have RCU read lock held.
Probability of use-after-free isn't zero here.

Also add lockdep assert into dl_bw_cpus().

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org> # v3.14+
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140922183624.11015.71558.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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