From: "Harry Yoo (Oracle)" <harry@kernel.org>
To: Qi Zheng <qi.zheng@linux.dev>
Cc: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com,
roman.gushchin@linux.dev, shakeel.butt@linux.dev,
muchun.song@linux.dev, david@kernel.org, ljs@kernel.org,
ziy@nvidia.com, yosry.ahmed@linux.dev, imran.f.khan@oracle.com,
kamalesh.babulal@oracle.com, axelrasmussen@google.com,
yuanchu@google.com, weixugc@google.com,
chenridong@huaweicloud.com, mkoutny@suse.com,
akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com,
apais@linux.microsoft.com, lance.yang@linux.dev, bhe@redhat.com,
usamaarif642@gmail.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Qi Zheng <zhengqi.arch@bytedance.com>
Subject: Re: [PATCH v3 1/3] mm: memcontrol: correct the type of stats_updates to unsigned long
Date: Mon, 30 Mar 2026 10:14:40 +0900 [thread overview]
Message-ID: <acnOgEK3KMLiF5wg@hyeyoo> (raw)
In-Reply-To: <a5b0b468e7b4fe5f26c50e36d5d016f16d92f98f.1774604356.git.zhengqi.arch@bytedance.com>
On Fri, Mar 27, 2026 at 06:16:28PM +0800, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@bytedance.com>
>
> The memcg_rstat_updated() tracks updates for vmstats_percpu->state
> and lruvec_stats_percpu->state. Since these state values are of type long,
> change the val parameter passed to memcg_rstat_updated() to long as well.
>
> Correspondingly, change the type of stats_updates in struct
> memcg_vmstats_percpu and struct memcg_vmstats from unsigned int and
> atomic_t to unsigned long and atomic_long_t respectively to prevent
> potential overflow when handling large state updates during the
> reparenting of LRU folios.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
> Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
> ---
Looks good to me,
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
--
Cheers,
Harry / Hyeonggon
next prev parent reply other threads:[~2026-03-30 1:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-27 10:16 [PATCH v3 0/3] fix unexpected type conversions and potential overflows Qi Zheng
2026-03-27 10:16 ` [PATCH v3 1/3] mm: memcontrol: correct the type of stats_updates to unsigned long Qi Zheng
2026-03-27 15:45 ` Zi Yan
2026-03-30 1:14 ` Harry Yoo (Oracle) [this message]
2026-03-27 10:16 ` [PATCH v3 2/3] mm: memcontrol: change val type to long in __mod_memcg_{lruvec_}state() Qi Zheng
2026-03-27 15:48 ` Zi Yan
2026-03-30 1:25 ` Harry Yoo (Oracle)
2026-03-30 2:22 ` Qi Zheng
2026-03-27 10:16 ` [PATCH v3 3/3] mm: memcontrol: correct the nr_pages parameter type of mem_cgroup_update_lru_size() Qi Zheng
2026-03-27 10:22 ` Lorenzo Stoakes (Oracle)
2026-03-27 15:49 ` Zi Yan
2026-03-30 1:32 ` Harry Yoo (Oracle)
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