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Message-Id: <20240611112131.25925b8ee5198668b88de35f@linux-foundation.org>
Date: Tue, 11 Jun 2024 11:21:31 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: Andrew Bresticker <abrestic@...osinc.com>, David Hildenbrand
<david@...hat.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/memory: Don't require head page for do_set_pmd()
On Tue, 11 Jun 2024 19:03:29 +0100 Matthew Wilcox <willy@...radead.org> wrote:
> On Tue, Jun 11, 2024 at 08:32:16AM -0700, Andrew Bresticker wrote:
> > - if (page != &folio->page || folio_order(folio) != HPAGE_PMD_ORDER)
> > + if (folio_order(folio) != HPAGE_PMD_ORDER)
> > return ret;
> > + page = &folio->page;
>
> This works today, but in about six months time it's going to be a pain.
>
> + page = folio_page(folio, 0);
>
> is the one which works today and in the future.
I was wondering about that.
hp2:/usr/src/25> fgrep "&folio->page" mm/*.c | wc -l
84
hp2:/usr/src/25> fgrep "folio_page(" mm/*.c | wc -l
35
Should these all be converted? What's the general rule here?
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