linux-kernel - Re: [RFC PATCH 2/2] mm/gup: introduce vaddr_pin_pages

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Date:   Fri, 16 Aug 2019 13:31:20 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     Jerome Glisse <jglisse@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        John Hubbard <jhubbard@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] mm/gup: introduce vaddr_pin_pages_remote()

On Fri, Aug 16, 2019 at 06:13:55PM +0200, Jan Kara wrote:

> > For 3 we do not need to take a reference at all :) So just forget about 3
> > it does not exist. For 3 the reference is the reference the CPU page table
> > has on the page and that's it. GUP is no longer involve in ODP or anything
> > like that.
> 
> Yes, I understand. But the fact is that GUP calls are currently still there
> e.g. in ODP code. If you can make the code work without taking a page
> reference at all, I'm only happy :)

We are working on it :)

Jason