linux-kernel - Re: [PATCH] mm/doc: Replace isolate_lru_page with folio_isolate

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Date:   Thu, 9 Feb 2023 13:58:09 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Jonathan Corbet <corbet@....net>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        chinwen.chang@...iatek.com, andrew.yang@...iatek.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm/doc: Replace isolate_lru_page with folio_isolate_lru

On Thu, Feb 09, 2023 at 03:10:07PM +0200, Mike Rapoport wrote:
> On Thu, Feb 02, 2023 at 11:02:11AM -0700, Jonathan Corbet wrote:
> > Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com> writes:
> > 
> > > Since we introduce folio, replace isolate_lru_page() with
> > > folio_isolate_lru().
> > >
> > > Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
> > > ---
> > >  Documentation/mm/page_migration.rst | 6 +++---
> > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > This seems like a good patch to copy to linux-mm - done now.
> > 
> > The patch perhaps is a closer match to what's in linux-next, but it
> > seems that, if we're going to update this document, we should reflect
> > the use folios throughout?
> 
> Most of the current users of migrate_pages() still use isolate_lru_page()
> so I think that updating page_migration.rst to folios is premature.
> But when we do the update it also should include the translations.

It's a slim majority -- 9 of isolate_lru_pages() and 7 of
folio_isolate_lru().  I don't think that changing the documentation is
premature; we should document the functions we want people to use.
I'd be surprised if isolate_lru_pages() still existed in six months.