[Patch v4] mm/page_alloc.c: use NODE_MASK_NONE in build_zonelists()

[Wei Yang]

Slightly simplify the code by initializing user_mask with NODE_MASK_NONE,
instead of later calling nodes_clear(). This saves a line of code.

Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

---
v4: adjust subject/description as suggested by John Hubbard
v3: adjust the commit log a little
v2: use NODE_MASK_NONE as suggested by David Hildenbrand
---
 mm/page_alloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ef790dfad6aa..dfcf2682ed40 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5587,14 +5587,13 @@ static void build_zonelists(pg_data_t *pgdat)
 {
 	static int node_order[MAX_NUMNODES];
 	int node, load, nr_nodes = 0;
-	nodemask_t used_mask;
+	nodemask_t used_mask = NODE_MASK_NONE;
 	int local_node, prev_node;
 
 	/* NUMA-aware ordering of nodes */
 	local_node = pgdat->node_id;
 	load = nr_online_nodes;
 	prev_node = local_node;
-	nodes_clear(used_mask);
 
 	memset(node_order, 0, sizeof(node_order));
 	while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
-- 
2.23.0