linux-kernel - Re: [PATCH 07/11] mm: VM_BUG

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Message-ID: <20201216005913.GW2443@casper.infradead.org>
Date:   Wed, 16 Dec 2020 00:59:13 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Yu Zhao <yuzhao@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>, Vlastimil Babka <vbabka@...e.cz>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/11] mm: VM_BUG_ON lru page flags

On Tue, Dec 15, 2020 at 05:54:51PM -0700, Yu Zhao wrote:
> On Mon, Dec 07, 2020 at 10:24:29PM +0000, Matthew Wilcox wrote:
> > On Mon, Dec 07, 2020 at 03:09:45PM -0700, Yu Zhao wrote:
> > > Move scattered VM_BUG_ONs to two essential places that cover all
> > > lru list additions and deletions.
> > 
> > I'd like to see these converted into VM_BUG_ON_PGFLAGS so you have
> > to take that extra CONFIG step to enable checking them.
> 
> Right. I'll make sure it won't slip my mind again in v2.

Hugh has enlightened me that VM_BUG_ON_PGFLAGS() should not be used for
this purpose.  Sorry for the bad recommendation.