linux-ext4 - Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

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Date:   Fri, 11 Feb 2022 12:45:37 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Alex Sierra <alex.sierra@....com>, akpm@...ux-foundation.org,
        Felix.Kuehling@....com, linux-mm@...ck.org, rcampbell@...dia.com,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        hch@....de, jglisse@...hat.com, apopple@...dia.com,
        willy@...radead.org
Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

On Fri, Feb 11, 2022 at 05:15:25PM +0100, David Hildenbrand wrote:

> ... I'm pretty sure we cannot FOLL_PIN DEVICE_PRIVATE pages

Currently the only way to get a DEVICE_PRIVATE page out of the page
tables is via hmm_range_fault() and that doesn't manipulate any ref
counts.

Jason