From: Hugh Dickins Date: Wed, 24 Aug 2011 23:46:48 +0000 (+1000) Subject: radix_tree_tag_get()'s BUG (when it sees a tag after saw_unset_tag) was X-Git-Tag: next-20110922~2^2~87 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fa6e792ec3281eaa4971f854257efba4b32da166;p=karo-tx-linux.git radix_tree_tag_get()'s BUG (when it sees a tag after saw_unset_tag) was unsafe and removed in 2.6.34, but the pointless saw_unset_tag left behind. Remove it now, and return 0 as soon as we see unset tag - we already rely upon the root tag to be correct, returning 0 immediately if it's not set. Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton --- diff --git a/lib/radix-tree.c b/lib/radix-tree.c index a2f9da59c197..d9df7454519c 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -576,7 +576,6 @@ int radix_tree_tag_get(struct radix_tree_root *root, { unsigned int height, shift; struct radix_tree_node *node; - int saw_unset_tag = 0; /* check the root's tag bit */ if (!root_tag_get(root, tag)) @@ -603,15 +602,10 @@ int radix_tree_tag_get(struct radix_tree_root *root, return 0; offset = (index >> shift) & RADIX_TREE_MAP_MASK; - - /* - * This is just a debug check. Later, we can bale as soon as - * we see an unset tag. - */ if (!tag_get(node, tag, offset)) - saw_unset_tag = 1; + return 0; if (height == 1) - return !!tag_get(node, tag, offset); + return 1; node = rcu_dereference_raw(node->slots[offset]); shift -= RADIX_TREE_MAP_SHIFT; height--;