Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h
index 33536cd..74ae226 100644
--- a/fs/btrfs/delayed-inode.h
+++ b/fs/btrfs/delayed-inode.h
@@ -50,8 +50,8 @@
 	 * is waiting to be dealt with by the async worker.
 	 */
 	struct list_head p_list;
-	struct rb_root ins_root;
-	struct rb_root del_root;
+	struct rb_root_cached ins_root;
+	struct rb_root_cached del_root;
 	struct mutex mutex;
 	struct btrfs_inode_item inode_item;
 	refcount_t refs;