linux-kernel - [Patch v2 2/2] mm/page_alloc.c: define node

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Message-Id: <20200327220121.27823-2-richard.weiyang@gmail.com>
Date:   Fri, 27 Mar 2020 22:01:21 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, jgg@...pe.ca,
        david@...hat.com, Wei Yang <richard.weiyang@...il.com>
Subject: [Patch v2 2/2] mm/page_alloc.c: define node_order with all zero

Since we always clear node_order before getting it, we can leverage
compiler to do this instead of at run time.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 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 dfcf2682ed40..49dd1f25c000 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5585,7 +5585,7 @@ static void build_thisnode_zonelists(pg_data_t *pgdat)
 
 static void build_zonelists(pg_data_t *pgdat)
 {
-	static int node_order[MAX_NUMNODES];
+	static int node_order[MAX_NUMNODES] = {0};
 	int node, load, nr_nodes = 0;
 	nodemask_t used_mask = NODE_MASK_NONE;
 	int local_node, prev_node;
@@ -5595,7 +5595,6 @@ static void build_zonelists(pg_data_t *pgdat)
 	load = nr_online_nodes;
 	prev_node = local_node;
 
-	memset(node_order, 0, sizeof(node_order));
 	while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
 		/*
 		 * We don't want to pressure a particular node.
-- 
2.23.0