+ mm-memcg-remove-redundant-seq_buf_has_overflowed.patch added to mm-unstable branch

+ mm-memcg-remove-redundant-seq_buf_has_overflowed.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: memcg: remove redundant seq_buf_has_overflowed()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-memcg-remove-redundant-seq_buf_has_overflowed.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcg-remove-redundant-seq_buf_has_overflowed.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Xiu Jianfeng <xiujianfeng@huawei.com>
Subject: mm: memcg: remove redundant seq_buf_has_overflowed()
Date: Wed, 26 Jun 2024 09:42:32 +0000

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
redundant one.

Link: https://lkml.kernel.org/r/20240626094232.2432891-1-xiujianfeng@huawei.com
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/memcontrol.c~mm-memcg-remove-redundant-seq_buf_has_overflowed
+++ a/mm/memcontrol.c
@@ -1476,9 +1476,6 @@ static void memcg_stat_format(struct mem
 			       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 memory_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
_

Patches currently in -mm which might be from xiujianfeng@huawei.com are

mm-memcg-remove-redundant-seq_buf_has_overflowed.patch