[PATCH 51/54] mm: replace nodes_weight with nodes_weight_eq in mempolicy

[Yury Norov]

do_migrate_pages() calls nodes_weight() to compare the weight
of nodemask with a given number. We can do it more efficiently with
nodes_weight_eq() because conditional nodes_weight() may stop
traversing the nodemask earlier, as soon as condition is met.

Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
---
 mm/mempolicy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a86590b2507d..27817cf2f2a0 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1157,7 +1157,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
 			 *          [0-7] - > [3,4,5] moves only 0,1,2,6,7.
 			 */
 
-			if ((nodes_weight(*from) != nodes_weight(*to)) &&
+			if (!nodes_weight_eq(*from, nodes_weight(*to)) &&
 						(node_isset(s, *to)))
 				continue;
 
-- 
2.30.2