From ba5c74ff2d2653dbf456791be21b179e7a66ef81 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Mon, 23 Aug 2010 10:33:19 +1000 Subject: [PATCH] radix-tree: clear all tags in radix_tree_node_rcu_free Commit b5d84a7834f8374c1feb0b86e070f9559ee37190 ("mm: implement writeback livelock avoidance using page tagging") introduced a new radix tree tag, increasing the number of tags in each node from 2 to 3. It did not, however, fix up the code in radix_tree_node_rcu_free() that cleans up after radix_tree_shrink() and hence could leave stray tags set in the new tag array. The result is that the livelock avoidance code added in the the above commit would hit stale tags when doing tag based lookups, resulting in livelocks when trying to traverse the tree. Fix this problem in radix_tree_node_rcu_free() so it doesn't happen again in the future by using a loop to walk all the tags up to RADIX_TREE_MAX_TAGS to clear the stray tags radix_tree_shrink() leaves behind. Signed-off-by: Dave Chinner Acked-by: Nick Piggin Acked-by: Jan Kara --- lib/radix-tree.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/radix-tree.c b/lib/radix-tree.c index e907858498a6a..1014171dd1c52 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -174,14 +174,16 @@ static void radix_tree_node_rcu_free(struct rcu_head *head) { struct radix_tree_node *node = container_of(head, struct radix_tree_node, rcu_head); + int i; /* * must only free zeroed nodes into the slab. radix_tree_shrink * can leave us with a non-NULL entry in the first slot, so clear * that here to make sure. */ - tag_clear(node, 0, 0); - tag_clear(node, 1, 0); + for (i = 0; i < RADIX_TREE_MAX_TAGS; i++) + tag_clear(node, i, 0); + node->slots[0] = NULL; node->count = 0; -- 2.39.5