linux-kernel - Re: [PATCH] ext4/xfs: add page refcount helper

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Message-ID: <20201007144114.GB235506@mit.edu>
Date:   Wed, 7 Oct 2020 10:41:14 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ralph Campbell <rcampbell@...dia.com>,
        Linux MM <linux-mm@...ck.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ext4/xfs: add page refcount helper

On Tue, Oct 06, 2020 at 07:40:05PM -0700, Dan Williams wrote:
> On Tue, Oct 6, 2020 at 4:09 PM Ralph Campbell <rcampbell@...dia.com> wrote:
> >
> > There are several places where ZONE_DEVICE struct pages assume a reference
> > count == 1 means the page is idle and free. Instead of open coding this,
> > add a helper function to hide this detail.
> >
> > Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > ---
> >
> > I'm resending this as a separate patch since I think it is ready to
> > merge. Originally, this was part of an RFC and is unchanged from v3:
> > https://lore.kernel.org/linux-mm/20201001181715.17416-1-rcampbell@nvidia.com
> >
> > It applies cleanly to linux-5.9.0-rc7-mm1 but doesn't really
> > depend on anything, just simple merge conflicts when applied to
> > other trees.
> > I'll let the various maintainers decide which tree and when to merge.
> > It isn't urgent since it is a clean up patch.
> 
> Thanks Ralph, it looks good to me. Jan, or Ted care to ack? I don't
> have much else pending for dax at the moment as Andrew is carrying my
> dax updates for this cycle. Andrew please take this into -mm if you
> get a chance. Otherwise I'll cycle back to it when some other dax
> updates arrive in my queue.

Acked-by: Theodore Ts'o <tytso@....edu> # for fs/ext4/inode.c