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Subject: Re: [PATCH v3 08/11] mm: memcontrol: constify the memcg and lruvec
 stat readers
From: Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20260915-folio_memcg-const-v3-8-c239a6010b58@columbia.edu>
Date: Wed, 16 Sep 2026 10:35:24 +0800
Cc: Johannes Weiner <hannes@cmpxchg.org>,
 Michal Hocko <mhocko@kernel.org>,
 Roman Gushchin <roman.gushchin@linux.dev>,
 Shakeel Butt <shakeel.butt@linux.dev>,
 Andrew Morton <akpm@linux-foundation.org>,
 David Hildenbrand <david@kernel.org>,
 Lorenzo Stoakes <ljs@kernel.org>,
 "Liam R. Howlett" <liam@infradead.org>,
 Vlastimil Babka <vbabka@kernel.org>,
 Mike Rapoport <rppt@kernel.org>,
 Suren Baghdasaryan <surenb@google.com>,
 Kairui Song <kasong@tencent.com>,
 Qi Zheng <qi.zheng@linux.dev>,
 Barry Song <baohua@kernel.org>,
 Axel Rasmussen <axelrasmussen@google.com>,
 Yuanchu Xie <yuanchu@google.com>,
 Wei Xu <weixugc@google.com>,
 Baoquan He <baoquan.he@linux.dev>,
 Baolin Wang <baolin.wang@linux.alibaba.com>,
 Chris Li <chrisl@kernel.org>,
 Kemeng Shi <shikemeng@huaweicloud.com>,
 Nhat Pham <nphamcs@gmail.com>,
 Youngjun Park <youngjun.park@lge.com>,
 "Matthew Wilcox (Oracle)" <willy@infradead.org>,
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 linux-kernel@vger.kernel.org
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References: <20260915-folio_memcg-const-v3-0-c239a6010b58@columbia.edu>
 <20260915-folio_memcg-const-v3-8-c239a6010b58@columbia.edu>
To: Tal Zussman <tz2294@columbia.edu>
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> On Sep 16, 2026, at 07:20, Tal Zussman <tz2294@columbia.edu> wrote:
> 
> The memcg_page_state(), memcg_events(), and lruvec_page_state()
> families only read counters. Constify them.
> 
> Use container_of_const() in the lruvec_page_state() family while at it,
> so the const isn't silently cast away.
> 
> Signed-off-by: Tal Zussman <tz2294@columbia.edu>

Acked-by: Muchun Song <muchun.song@linux.dev>

Thanks.