linux-kernel - Re: [PATCH 1/2] mm: introduce put_user

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

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..