linux-kernel - [PATCH 1/2] mm/memcontrol: do not tweak node in mem_cgroup

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Date:   Thu, 15 Jun 2023 07:32:25 +0000
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     mhocko@...e.com
Cc:     roman.gushchin@...ux.dev, hannes@...xchg.org, shakeelb@...gle.com,
        akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH 1/2] mm/memcontrol: do not tweak node in mem_cgroup_init()

mem_cgroup_init() request for allocations from each possible node, and
it's used to be a problem because NODE_DATA is not allocated for offline
node. Things have already changed since commit 09f49dca570a9 ("mm: handle
uninitialized numa nodes gracefully"), so it's unnecessary to check for
!node_online nodes here.

Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
---
 mm/memcontrol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4b27e245a055..c73c5fb33f65 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -7421,8 +7421,7 @@ static int __init mem_cgroup_init(void)
 	for_each_node(node) {
 		struct mem_cgroup_tree_per_node *rtpn;
 
-		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
-				    node_online(node) ? node : NUMA_NO_NODE);
+		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, node);
 
 		rtpn->rb_root = RB_ROOT;
 		rtpn->rb_rightmost = NULL;
-- 
2.25.1