linux-kernel - Re: [PATCH RFC 4/5] mm/ksm, proc: introduce remote merge

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Message-ID: <20190516162946.zwzhxkft342b25pd@atomlin.usersys.com>
Date:   Thu, 16 May 2019 17:29:46 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Oleksandr Natalenko <oleksandr@...hat.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Hugh Dickins <hughd@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Greg KH <greg@...ah.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Timofey Titovets <nefelim4ag@...il.com>,
        Grzegorz Halat <ghalat@...hat.com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH RFC 4/5] mm/ksm, proc: introduce remote merge

On Thu 2019-05-16 12:00 +0200, Jann Horn wrote:
> On Thu, May 16, 2019 at 11:43 AM Oleksandr Natalenko
> <oleksandr@...hat.com> wrote:
[ ... ]
> > +       }
> > +
> > +       down_write(&mm->mmap_sem);
> 
> Should a check for mmget_still_valid(mm) be inserted here? See commit
> 04f5866e41fb70690e28397487d8bd8eea7d712a.

Yes - I'd say this is required here.

Thanks,

-- 
Aaron Tomlin