linux-kernel - Re: [PATCH v1 18/26] mm: zswap: prevent lruvec release in zswap_folio

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Message-ID: <aR7ifyNg5qG38BLp@hyeyoo>
Date: Thu, 20 Nov 2025 18:42:23 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com,
        roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
        muchun.song@...ux.dev, david@...hat.com, lorenzo.stoakes@...cle.com,
        ziy@...dia.com, imran.f.khan@...cle.com, kamalesh.babulal@...cle.com,
        axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>, Nhat Pham <nphamcs@...il.com>,
        Chengming Zhou <chengming.zhou@...ux.dev>,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v1 18/26] mm: zswap: prevent lruvec release in
 zswap_folio_swapin()

On Tue, Oct 28, 2025 at 09:58:31PM +0800, Qi Zheng wrote:
> From: Muchun Song <songmuchun@...edance.com>
> 
> In the near future, a folio will no longer pin its corresponding
> memory cgroup. So an lruvec returned by folio_lruvec() could be
> released without the rcu read lock or a reference to its memory
> cgroup.
> 
> In the current patch, the rcu read lock is employed to safeguard
> against the release of the lruvec in zswap_folio_swapin().
> 
> This serves as a preparatory measure for the reparenting of the
> LRU pages.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Acked-by: Nhat Pham <nphamcs@...il.com>
> Reviewed-by: Chengming Zhou <chengming.zhou@...ux.dev>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> ---

Looks good to me,
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

-- 
Cheers,
Harry / Hyeonggon