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

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Date:   Tue, 6 Oct 2020 19:40:05 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     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>,
        "Theodore Ts'o" <tytso@....edu>, 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 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.