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mm: memcg: adjust the warning when seq_buf overflows

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Currently it uses WARN_ON_ONCE() if seq_buf overflows when user reads
memory.stat, the only advantage of WARN_ON_ONCE is that the splat is so
verbose that it gets noticed.  And also it panics the system if
panic_on_warn is enabled.  It seems like the warning is just an over
reaction and a simple pr_warn should just achieve the similar effect.

Link: https://lkml.kernel.org/r/20240628072333.2496527-1-xiujianfeng@huawei.com
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Xiu Jianfeng 2024-06-28 07:23:33 +00:00 committed by Andrew Morton
parent 1c46cc0989
commit c2fad56b3c
1 changed files with 2 additions and 1 deletions
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3
mm/memcontrol.c
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@ -1484,7 +1484,8 @@ static void memory_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
memcg_stat_format(memcg, s);
else
memcg1_stat_format(memcg, s);
WARN_ON_ONCE(seq_buf_has_overflowed(s));
if (seq_buf_has_overflowed(s))
pr_warn("%s: Warning, stat buffer overflow, please report\n", __func__);
}
/**