linux-kernel - Re: [PATCH RFC 18/29] mm: remove __folio_test

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Message-ID: <5055937C-B3CC-4CBC-90C2-1F4BBABE2C09@nvidia.com>
Date: Fri, 20 Jun 2025 16:41:39 -0400
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 linux-doc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
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 Shakeel Butt <shakeel.butt@...ux.dev>
Subject: Re: [PATCH RFC 18/29] mm: remove __folio_test_movable()

On 18 Jun 2025, at 13:40, David Hildenbrand wrote:

> Convert to page_has_movable_ops(). While at it, cleanup relevant code
> a bit.
>
> The data_race() in migrate_folio_unmap() is questionable: we already
> hold a page reference, and concurrent modifications can no longer
> happen (iow: __ClearPageMovable() no longer exists). Drop it for now,
> we'll rework page_has_movable_ops() soon either way to no longer
> rely on page->mapping.
>
> Wherever we cast from folio to page now is a clear sign that this
> code has to be decoupled.
>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  include/linux/page-flags.h |  6 ------
>  mm/migrate.c               | 43 ++++++++++++--------------------------
>  mm/vmscan.c                |  6 ++++--
>  3 files changed, 17 insertions(+), 38 deletions(-)
>

Reviewed-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan, Zi