linux-kernel - Re: [PATCH v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL

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Message-ID: <1c428985-6ede-ef75-62bd-26ccf99f6d38@nvidia.com>
Date:   Mon, 4 Nov 2019 12:40:48 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     Jerome Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
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        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL_PIN

On 11/4/19 12:31 PM, Jason Gunthorpe wrote:
> On Mon, Nov 04, 2019 at 12:09:05PM -0800, John Hubbard wrote:
> 
>> Note for Jason: the (a) or (b) items are talking about the vfio case, which is
>> one of the two call sites that now use pin_longterm_pages_remote(), and the
>> other one is infiniband:
>>
>> drivers/infiniband/core/umem_odp.c:646:         npages = pin_longterm_pages_remote(owning_process, owning_mm,
> 
> This is a mistake, it is not a longterm pin and does not need FOLL_PIN
> semantics

OK! So it really just wants to be get_user_pages_remote() / put_page()? I'll
change it back to that.

> 
>> Jason should weigh in on how he wants this to go, with respect to branching
>> and merging, since it sounds like that will conflict with the hmm branch 
> 
> I think since you don't need to change this site things should be
> fine?
> 

Right. 


thanks,

John Hubbard
NVIDIA