linux-kernel - Re: [PATCH v4 10/11] mm: lru: add VM_BUG_ON

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Message-ID: <Yo01ghDEu4KcYKpH@cmpxchg.org>
Date:   Tue, 24 May 2022 15:44:02 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, duanxiongchun@...edance.com,
        longman@...hat.com
Subject: Re: [PATCH v4 10/11] mm: lru: add VM_BUG_ON_FOLIO to lru maintenance
 function

On Tue, May 24, 2022 at 02:05:50PM +0800, Muchun Song wrote:
> We need to make sure that the page is deleted from or added to the
> correct lruvec list. So add a VM_BUG_ON_FOLIO() to catch invalid
> users.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Makes sense, but please use VM_WARN_ON_ONCE_FOLIO() so the machine can
continue limping along for extracting debug information.