linux-kernel - Re: [PATCH v4 5/9] mm: introduce copy-on-fork VMAs and make VM_MAYBE

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Message-ID: <2456b1fb-3ea9-4632-8757-b8e0ea16dc29@lucifer.local>
Date: Wed, 14 Jan 2026 11:32:12 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Chris Mason <clm@...a.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, David Hildenbrand <david@...hat.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
        Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
        Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
        Lance Yang <lance.yang@...ux.dev>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Andrei Vagin <avagin@...il.com>
Subject: Re: [PATCH v4 5/9] mm: introduce copy-on-fork VMAs and make
 VM_MAYBE_GUARD one

On Wed, Jan 14, 2026 at 10:27:24AM +0000, Lorenzo Stoakes wrote:
> I'll send a fix.

Actually it's clear that assert is just wrong, so I'll drop it. we don't
assert elsewhere, this seems to be a 'nice to have', and I'd rather not
bother with a 'mmap or VMA lock' check here as it doesn't seem worth it.

Will send shortly.