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author | Wu Fengguang <fengguang.wu@intel.com> | 2008-11-27 11:42:22 +0100 |
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committer | Jiri Kosina <jkosina@suse.cz> | 2009-01-06 11:28:05 +0100 |
commit | 8e6bdb7f8b478323525444ecee7a1477ff5b6639 (patch) | |
tree | 02ff4e100e37a3fb8cf12b9cb321abe4ded58f36 | |
parent | 2b6a2f535dda8c60721b78699618d13d6799a29e (diff) | |
download | op-kernel-dev-8e6bdb7f8b478323525444ecee7a1477ff5b6639.zip op-kernel-dev-8e6bdb7f8b478323525444ecee7a1477ff5b6639.tar.gz |
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>
-rw-r--r-- | lib/radix-tree.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index be86b32..a7f5217 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) |