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>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2df5782eb0ac439c52ac28a849db01c3bfca9325..d0d9658ed1365658da7468a6a197c00514611ca7 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1476,9 +1476,6 @@ 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 memory_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)