commit 0e0ac9d9811add9d3a4892888c50f99f3ff80dd6
Author: Sudip Midya <Sudip.Midya@xxxxxxxxxxx>
Date:   Wed Sep 21 21:05:42 2016 +0530

    mm: remove unnecessary rcu_lock/unlock around radix_tree_tagged.
    The function queue_delayed_work is already protected with
    interrupts disabled, no need to add the rcu_lock

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index fb39a66..887c868 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -153,12 +153,10 @@ xfs_reclaim_work_queue(
 	struct xfs_mount        *mp)
 {
 
-	rcu_read_lock();
 	if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
 		queue_delayed_work(mp->m_reclaim_workqueue, &mp->m_reclaim_work,
 			msecs_to_jiffies(xfs_syncd_centisecs / 6 * 10));
 	}
-	rcu_read_unlock();
 }
 
 /*