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
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -656,7 +656,7 @@
*
* 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 @@
if (!radix_tree_lookup(root, index))
break;
index--;
- if (index == LONG_MAX)
+ if (index == ULONG_MAX)
break;
}