radix-tree: fix radix_tree_prev_hole() underflow case

radix_tree_prev_hole() used LONG_MAX to detect underflow; however,
ULONG_MAX is clearly what was intended, both here and by its only user
(count_history_pages at mm/readahead.c).

Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 2a087e0..05da38b 100644 (file)
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -656,7 +656,7 @@ EXPORT_SYMBOL(radix_tree_next_hole);
  *
  *     Returns: the index of the hole if found, otherwise returns an index
  *     outside of the set specified (in which case 'index - return >= max_scan'
- *     will be true). In rare cases of wrap-around, LONG_MAX will be returned.
+ *     will be true). In rare cases of wrap-around, ULONG_MAX 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
@@ -674,7 +674,7 @@ unsigned long radix_tree_prev_hole(struct radix_tree_root *root,
                if (!radix_tree_lookup(root, index))
                        break;
                index--;
-               if (index == LONG_MAX)
+               if (index == ULONG_MAX)
                        break;
        }