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trivial: radix-tree: document wrap-around issue of radix_tree_next_hole() 

And some 80-line cleanups.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Wu Fengguang 2008-11-27 11:42:22 +01:00 committed by Jiri Kosina
parent 2b6a2f535d
commit 8e6bdb7f8b
1 changed files with 6 additions and 5 deletions
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11
lib/radix-tree.c
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@ -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)