linux-kernel - Re: [PATCH v2 1/4] mm: Introduce vm_uffd

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Message-ID: <03360e3e-a91f-48df-be38-deba327db783@lucifer.local>
Date: Thu, 3 Jul 2025 17:32:03 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Peter Xu <peterx@...hat.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
        Muchun Song <muchun.song@...ux.dev>, Mike Rapoport <rppt@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        James Houghton <jthoughton@...gle.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Nikita Kalyazin <kalyazin@...zon.com>, Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Ujwal Kundur <ujwal.kundur@...il.com>
Subject: Re: [PATCH v2 1/4] mm: Introduce vm_uffd_ops API

On Wed, Jul 02, 2025 at 04:24:25PM -0400, Peter Xu wrote:
> On Wed, Jul 02, 2025 at 04:56:04PM +0100, Lorenzo Stoakes wrote:
> > I am also absolutely, to be frank, not going to accept us EXPORT()'ing
> > anything core.
>
> Could you be explicit on what you're absolutely against?  Is that the
> vm_uffd_ops (or any form of it) being exported, or anything else?

page table manipulation
core mm internals

In fact I think we need to minimise as much exposure as posible.

>
> Thanks,
>
> --
> Peter Xu
>