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From:   Dan Williams <dan.j.williams@intel.com>
Date:   Sun, 17 Oct 2021 11:20:53 -0700
Message-ID: <CAPcyv4h-KxpwJtrM4VV64J7EPk9JCPeW27jtPXyArarfeo9noA@mail.gmail.com>
Subject: Re: [PATCH v1 2/2] mm: remove extra ZONE_DEVICE struct page refcount
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Jason Gunthorpe <jgg@nvidia.com>,
        Alex Sierra <alex.sierra@amd.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Kuehling, Felix" <Felix.Kuehling@amd.com>,
        Linux MM <linux-mm@kvack.org>,
        Ralph Campbell <rcampbell@nvidia.com>,
        linux-ext4 <linux-ext4@vger.kernel.org>,
        linux-xfs <linux-xfs@vger.kernel.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>, Christoph Hellwig <hch@lst.de>,
        =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>,
        Alistair Popple <apopple@nvidia.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Linux NVDIMM <nvdimm@lists.linux.dev>
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On Sat, Oct 16, 2021 at 9:39 AM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Sat, Oct 16, 2021 at 12:44:50PM -0300, Jason Gunthorpe wrote:
> > Assuming changing FSDAX is hard.. How would DAX people feel about just
> > deleting the PUD/PMD support until it can be done with compound pages?
>
> I think there are customers who would find that an unacceptable answer :-)

No, not given the number of end users that ask for help debugging PMD support.