linux-ext4 - Re: [PATCH 1/3] mm: Add folio_zero

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Message-ID: <CAHpGcMLU9CeX=P=718Gp=oYNnfbft_Mh1Nhdx45qWXY0DAf6Mg@mail.gmail.com>
Date:   Thu, 9 Nov 2023 01:12:15 +0100
From:   Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>, gfs2@...ts.linux.dev,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-erofs@...ts.ozlabs.org, "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Andreas Gruenbacher <agruenba@...hat.com>
Subject: Re: [PATCH 1/3] mm: Add folio_zero_tail() and use it in ext4

Andrew,

Andrew Morton <akpm@...ux-foundation.org> schrieb am Do., 9. Nov. 2023, 00:06:
> > +
> > +     if (folio_test_highmem(folio)) {
> > +             size_t max = PAGE_SIZE - offset_in_page(offset);
> > +
> > +             while (len > max) {
>
> Shouldn't this be `while (len)'?  AFAICT this code can fail to clear
> the final page.

not sure what you're seeing there, but this looks fine to me.

Thanks,
Andreas