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| author | Marcelo Tosatti <marcelo.tosatti@cyclades.com> | 2005-09-06 15:16:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:21 -0700 |
| commit | 32605a18152b246df483fadc1c23854addde8755 (patch) | |
| tree | cb13f4d0d9040120b5ef6a90c8b174a0619756d0 | |
| parent | 201b6264ff3865090747f58f48e087c3a35e0dbc (diff) | |
| download | lwn-32605a18152b246df483fadc1c23854addde8755.tar.gz lwn-32605a18152b246df483fadc1c23854addde8755.zip | |
[PATCH] radix_tag_get(): differentiate between no present node and tag unset cases
Simple patch to radix_tree_tag_get() to return different values for non
present node and tag unset.
The function is not used by any in-kernel callers (yet), but this
information is definitely useful.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | lib/radix-tree.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 2e9bd54beba4..b972dd29289d 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -418,15 +418,16 @@ EXPORT_SYMBOL(radix_tree_tag_clear); #ifndef __KERNEL__ /* Only the test harness uses this at present */ /** - * radix_tree_tag_get - get a tag on a radix tree node - * @root: radix tree root - * @index: index key - * @tag: tag index + * radix_tree_tag_get - get a tag on a radix tree node + * @root: radix tree root + * @index: index key + * @tag: tag index * - * Return the search tag corresponging to @index in the radix tree. + * Return values: * - * Returns zero if the tag is unset, or if there is no corresponding item - * in the tree. + * 0: tag not present + * 1: tag present, set + * -1: tag present, unset */ int radix_tree_tag_get(struct radix_tree_root *root, unsigned long index, int tag) @@ -460,7 +461,7 @@ int radix_tree_tag_get(struct radix_tree_root *root, int ret = tag_get(slot, tag, offset); BUG_ON(ret && saw_unset_tag); - return ret; + return ret ? 1 : -1; } slot = slot->slots[offset]; shift -= RADIX_TREE_MAP_SHIFT; |