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Date: Sat, 8 Dec 2018 08:48:25 -0800
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/2] mm: introduce put_user_page*(), placeholder versions
Message-ID: <20181208164825.GA26154@infradead.org>
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To: Jerome Glisse <jglisse@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>, John Hubbard <jhubbard@nvidia.com>, Matthew Wilcox <willy@infradead.org>, John Hubbard <john.hubbard@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Linux MM <linux-mm@kvack.org>, Jan Kara <jack@suse.cz>, tom@talpey.com, Al Viro <viro@zeniv.linux.org.uk>, benve@cisco.com, Christoph Hellwig <hch@infradead.org>, Christopher Lameter <cl@linux.com>, "Dalessandro, Dennis" <dennis.dalessandro@intel.com>, Doug Ledford <dledford@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>, Michal Hocko <mhocko@kernel.org>, Mike Marciniszyn <mike.marciniszyn@intel.com>, rcampbell@nvidia.com, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>

On Sat, Dec 08, 2018 at 11:33:53AM -0500, Jerome Glisse wrote:
> Patchset to use HMM inside nouveau have already been posted, some
> of the bits have already made upstream and more are line up for
> next merge window.

Even with that it is a relative fringe feature compared to making
something like get_user_pages() that is literally used every to actually
work properly.

So I think we need to kick out HMM here and just find another place for
it to store data.

And just to make clear that I'm not picking just on this - the same is
true to a just a little smaller extent for the pgmap..