linux-kernel - Re: [PATCH v4 11/19] mm, swap: split locked entry duplicating into a standalone helper

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Message-ID: <CAMgjq7C3XxHNALturkgpzne6VYTSmsyBMTTG68MMQJaQt=1j6g@mail.gmail.com>
Date: Sat, 20 Dec 2025 01:26:56 +0800
From: Kairui Song <ryncsn@...il.com>
To: Baoquan He <bhe@...hat.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Barry Song <baohua@...nel.org>, Chris Li <chrisl@...nel.org>, Nhat Pham <nphamcs@...il.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, David Hildenbrand <david@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>, Youngjun Park <youngjun.park@....com>, 
	Hugh Dickins <hughd@...gle.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>, 
	Ying Huang <ying.huang@...ux.alibaba.com>, Kemeng Shi <shikemeng@...weicloud.com>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/19] mm, swap: split locked entry duplicating into a
 standalone helper

On Thu, Dec 18, 2025 at 2:37 AM Kairui Song <ryncsn@...il.com> wrote:
>
> On Wed, Dec 17, 2025 at 7:22 PM Baoquan He <bhe@...hat.com> wrote:
> >
> > On 12/05/25 at 03:29am, Kairui Song wrote:
> > > From: Kairui Song <kasong@...cent.com>
> > >
> > > No feature change, split the common logic into a stand alone helper to
> >                                                    ~~~~~~~~~~~
> >                                                     standalone, typo?
> > > be reused later.
> >
> > In phase 2, I saw the newly added swap_dup_entries() is only called by
> > __swap_duplicate(). The 'reused later' means?
> >
>
> Ah you are right, this patch belongs to phase 3 I think, I can drop it
> for now, it's just a code rearrangement. Thanks!

Hi Baoquan

While working on V5 I noticed we do need this patch, the patch "mm,
swap: use swap cache as the swap in synchronize layer" needs this
splitted helper as an intermediate step. That usage will be dropped by
the end of this series but I think we can live with this splitted out
helper. The splitted helper and original help will all be gone in
phase 3, and there is no behavior change at all.