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

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Date:   Tue, 20 Mar 2018 12:33:26 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     jglisse@...hat.com, 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 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?
-- 
Michal Hocko
SUSE Labs