[PATCH 05/16] overlayfs: Replace smp_read_barrier_depends() with lockless_dereference()

[Pranith Kumar <bobby.prani@gmail.com>]

Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
---
 fs/overlayfs/super.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 08b704c..b0f050e 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -84,12 +84,10 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
 
 static struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
 {
-	struct dentry *upperdentry = ACCESS_ONCE(oe->__upperdentry);
 	/*
 	 * Make sure to order reads to upperdentry wrt ovl_dentry_update()
 	 */
-	smp_read_barrier_depends();
-	return upperdentry;
+	return lockless_dereference(oe->__upperdentry);
 }
 
 void ovl_path_upper(struct dentry *dentry, struct path *path)
-- 
1.9.1