linux-kernel - [PATCH -next] mm: memcg: remove redundant seq_buf_has

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Message-ID: <20240626094232.2432891-1-xiujianfeng@huawei.com>
Date: Wed, 26 Jun 2024 09:42:32 +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 -next] mm: memcg: remove redundant seq_buf_has_overflowed()

Both the end of memory_stat_format() and memcg_stat_format() will call
WARN_ON_ONCE(seq_buf_has_overflowed()). However, memory_stat_format()
is the only caller of memcg_stat_format(), when memcg is on the default
hierarchy, seq_buf_has_overflowed() will be executed twice, so remove
the reduntant one.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 mm/memcontrol.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 974bd160838c..776d22bc66a2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1846,9 +1846,6 @@ static void memcg_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
 			       vm_event_name(memcg_vm_event_stat[i]),
 			       memcg_events(memcg, memcg_vm_event_stat[i]));
 	}
-
-	/* The above should easily fit into one page */
-	WARN_ON_ONCE(seq_buf_has_overflowed(s));
 }
 
 static void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s);
-- 
2.34.1