diff --git a/[refs] b/[refs]
index aea84767e422..4cd02d3c79f6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1817dc0370873caff77b924b53ae489edaf9b1e2
+refs/heads/master: ac15ee691fe84cb46cbd2497ddcb10e246f7ee47
diff --git a/trunk/lib/radix-tree.c b/trunk/lib/radix-tree.c
index 5086bb962b4d..7ea2e033d715 100644
--- a/trunk/lib/radix-tree.c
+++ b/trunk/lib/radix-tree.c
@@ -736,10 +736,11 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
 		}
 	}
 	/*
-	 * The iftag must have been set somewhere because otherwise
-	 * we would return immediated at the beginning of the function
+	 * We need not to tag the root tag if there is no tag which is set with
+	 * settag within the range from *first_indexp to last_index.
 	 */
-	root_tag_set(root, settag);
+	if (tagged > 0)
+		root_tag_set(root, settag);
 	*first_indexp = index;
 
 	return tagged;