From: Nick Piggin <nickpiggin@yahoo.com.au>

And here's the patch.

Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 lib/radix-tree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN lib/radix-tree.c~radix-tree-rcu-lockless-readside-semicolon lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-rcu-lockless-readside-semicolon
+++ a/lib/radix-tree.c
@@ -751,7 +751,7 @@ __lookup_tag(struct radix_tree_node *slo
 		}
 		shift -= RADIX_TREE_MAP_SHIFT;
 		slot = rcu_dereference(slot->slots[i]);
-		if (slot == NULL);
+		if (slot == NULL)
 			break;
 	}
 out:
_