X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=lib%2Fradix-tree.c;h=4bb42a0344ec49f5224d74c932786f0842446bef;hb=f64f79ea5f5e02ba8585f35a10b4a3bcab0cea52;hp=8d3fb0bd128898b09ba6b01f9c0038b72fbc499a;hpb=8cef7d57a4a47ef7166acde05eea0bc4f723691c;p=safe%2Fjmp%2Flinux-2.6

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 8d3fb0b..4bb42a0 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -640,13 +640,14 @@ EXPORT_SYMBOL(radix_tree_tag_get);
  *
  *	Returns: the index of the hole if found, otherwise returns an index
  *	outside of the set specified (in which case 'return - index >= max_scan'
- *	will be true).
+ *	will be true). In rare cases of index wrap-around, 0 will be returned.
  *
  *	radix_tree_next_hole may be called under rcu_read_lock. However, like
- *	radix_tree_gang_lookup, this will not atomically search a snapshot of the
- *	tree at a single point in time. For example, if a hole is created at index
- *	5, then subsequently a hole is created at index 10, radix_tree_next_hole
- *	covering both indexes may return 10 if called under rcu_read_lock.
+ *	radix_tree_gang_lookup, this will not atomically search a snapshot of
+ *	the tree at a single point in time. For example, if a hole is created
+ *	at index 5, then subsequently a hole is created at index 10,
+ *	radix_tree_next_hole covering both indexes may return 10 if called
+ *	under rcu_read_lock.
  */
 unsigned long radix_tree_next_hole(struct radix_tree_root *root,
 				unsigned long index, unsigned long max_scan)