linux-kernel - [PATCH v3 -next] mm: memcg: make alloc_mem_cgroup_per_node

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Date: Tue, 7 May 2024 13:23:24 +0000
From: Xiu Jianfeng <xiujianfeng@...wei.com>
To: <hannes@...xchg.org>, <mhocko@...nel.org>, <roman.gushchin@...ux.dev>,
	<shakeel.butt@...ux.dev>, <muchun.song@...ux.dev>,
	<akpm@...ux-foundation.org>
CC: <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v3 -next] mm: memcg: make alloc_mem_cgroup_per_node_info() return bool

alloc_mem_cgroup_per_node_info() returns int that doesn't map to any
errno error code. The only existing caller doesn't really need an error
code so change the the function to return bool (true on success) because
this is slightly less confusing and more consistent with the other code.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
Acked-by: Michal Hocko <mhocko@...e.com>
---
 mm/memcontrol.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index feb6651ee1e8..5d4da23264fa 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5642,13 +5642,13 @@ struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 }
 #endif
 
-static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
+static bool alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 {
 	struct mem_cgroup_per_node *pn;
 
 	pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, node);
 	if (!pn)
-		return 1;
+		return false;
 
 	pn->lruvec_stats = kzalloc_node(sizeof(struct lruvec_stats),
 					GFP_KERNEL_ACCOUNT, node);
@@ -5664,11 +5664,11 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 	pn->memcg = memcg;
 
 	memcg->nodeinfo[node] = pn;
-	return 0;
+	return true;
 fail:
 	kfree(pn->lruvec_stats);
 	kfree(pn);
-	return 1;
+	return false;
 }
 
 static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
@@ -5741,7 +5741,7 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
 	}
 
 	for_each_node(node)
-		if (alloc_mem_cgroup_per_node_info(memcg, node))
+		if (!alloc_mem_cgroup_per_node_info(memcg, node))
 			goto fail;
 
 	if (memcg_wb_domain_init(memcg, GFP_KERNEL))
-- 
2.34.1