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 3/3] mm: memcontrol: correct the nr_pages parameter type of mem_cgroup_update_lru_size()
Date: Mon, 30 Mar 2026 10:32:50 +0900 [thread overview]
Message-ID: <acnSwgYE9BWTBmNj@hyeyoo> (raw)
In-Reply-To: <fd4140de44fa0a3978e4e2426731187fe8625f0b.1774604356.git.zhengqi.arch@bytedance.com>
On Fri, Mar 27, 2026 at 06:16:30PM +0800, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@bytedance.com>
>
> The nr_pages parameter of mem_cgroup_update_lru_size() represents a page
> count. During the reparenting of LRU folios, the value passed to it can
> potentially exceed the maximum value of a 32-bit integer. It should be
> declared as long instead of int to match the types used in lruvec size
> accounting and to prevent possible overflow.
>
> Update the parameter type to long to ensure correctness.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
> ---
Looks good to me,
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
--
Cheers,
Harry / Hyeonggon
prev parent reply other threads:[~2026-03-30 1:32 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)
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) [this message]
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