mm/page_alloc.c: use NODE_MASK_NONE in build_zonelists()

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 <[email protected]>

Reviewed-by John Hubbard <[email protected]>

Reviewed-by David Hildenbrand <[email protected]>

---
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(-)

mm/page_alloc.c +1 -3

index ef790dfad6aa..dfcf2682ed40 100644
@@ -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