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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
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>

authored by

Xiu Jianfeng and committed by
Andrew Morton 1c46cc09 a591d35c

-3
-3
mm/memcontrol.c
··· 1476 1476 vm_event_name(memcg_vm_event_stat[i]), 1477 1477 memcg_events(memcg, memcg_vm_event_stat[i])); 1478 1478 } 1479 - 1480 - /* The above should easily fit into one page */ 1481 - WARN_ON_ONCE(seq_buf_has_overflowed(s)); 1482 1479 } 1483 1480 1484 1481 static void memory_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)