linux-kernel - Re: [PATCH v2 28/28] mm: lru: add VM_WARN_ON_ONCE

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Message-ID: <aUQKmOvR1uVfXqgc@cmpxchg.org>
Date: Thu, 18 Dec 2025 09:07:20 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hughd@...gle.com, mhocko@...e.com, roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev, muchun.song@...ux.dev, david@...nel.org,
	lorenzo.stoakes@...cle.com, ziy@...dia.com, harry.yoo@...cle.com,
	imran.f.khan@...cle.com, kamalesh.babulal@...cle.com,
	axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
	chenridong@...weicloud.com, mkoutny@...e.com,
	akpm@...ux-foundation.org, hamzamahfooz@...ux.microsoft.com,
	apais@...ux.microsoft.com, lance.yang@...ux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Muchun Song <songmuchun@...edance.com>,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v2 28/28] mm: lru: add VM_WARN_ON_ONCE_FOLIO to lru
 maintenance helpers

On Wed, Dec 17, 2025 at 03:27:52PM +0800, Qi Zheng wrote:
> From: Muchun Song <songmuchun@...edance.com>
> 
> We must ensure the folio is deleted from or added to the correct lruvec
> list. So, add VM_WARN_ON_ONCE_FOLIO() to catch invalid users. The
> VM_BUG_ON_PAGE() in move_pages_to_lru() can be removed as
> add_page_to_lru_list() will perform the necessary check.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>