linux-kernel - Re: [PATCH 3/4] mm/hmm: HMM should have a callback before MM is destroyed

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Message-ID: <20180320144531.GA3716@redhat.com>
Date:   Tue, 20 Mar 2018 10:45:31 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Ralph Campbell <rcampbell@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH 3/4] mm/hmm: HMM should have a callback before MM is
 destroyed

On Tue, Mar 20, 2018 at 12:33:26PM +0100, Michal Hocko wrote:
> On Thu 15-03-18 15:48:29, Andrew Morton wrote:
> > On Thu, 15 Mar 2018 14:36:59 -0400 jglisse@...hat.com wrote:
> > 
> > > From: Ralph Campbell <rcampbell@...dia.com>
> > > 
> > > The hmm_mirror_register() function registers a callback for when
> > > the CPU pagetable is modified. Normally, the device driver will
> > > call hmm_mirror_unregister() when the process using the device is
> > > finished. However, if the process exits uncleanly, the struct_mm
> > > can be destroyed with no warning to the device driver.
> > 
> > The changelog doesn't tell us what the runtime effects of the bug are. 
> > This makes it hard for me to answer the "did Jerome consider doing
> > cc:stable" question.
> 
> There is no upstream user of this code IIRC, so does it make sense to
> mark anything for stable trees?

I am fine with dropping stable, distribution that care about out of tree
drivers can easily backport themself. I am hoping to have the nouveau
part upstream in 4.18/4.19 ...

Cheers,
Jérôme