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

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Message-ID: <aFmVSNrPK9a2KN7p@x1.local>
Date: Mon, 23 Jun 2025 13:56:24 -0400
From: Peter Xu <peterx@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Nikita Kalyazin <kalyazin@...zon.com>,
	Hugh Dickins <hughd@...gle.com>, Oscar Salvador <osalvador@...e.de>,
	Michal Hocko <mhocko@...e.com>, Muchun Song <muchun.song@...ux.dev>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ujwal Kundur <ujwal.kundur@...il.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	James Houghton <jthoughton@...gle.com>,
	Mike Rapoport <rppt@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>
Subject: Re: [PATCH 1/4] mm: Introduce vm_uffd_ops API

On Mon, Jun 23, 2025 at 07:25:11PM +0200, David Hildenbrand wrote:
> Oh, yes, agreed on WP_ASYNC. But they would not be using the vma_ops thingy,
> right?

Yes, currently WP_ASYNC bypassed that. So if something declares WP in the
uffd_features in the new API it'll be only for sync (and it really should
almost start working for most files too like what async did..).

-- 
Peter Xu