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Date: Sun, 5 Jul 2026 00:51:24 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Lorenzo Stoakes <ljs@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>, "David Hildenbrand (Arm)"
 <david@kernel.org>, Linus Torvalds <torvalds@linuxfoundation.org>,
 Alexander Viro <viro@zeniv.linux.org.uk>, Christian Brauner
 <brauner@kernel.org>, Jan Kara <jack@suse.cz>, Oleg Nesterov
 <oleg@redhat.com>, Peter Xu <peterx@redhat.com>, vova tokarev
 <vladimirelitokarev@gmail.com>, linux-kernel@vger.kernel.org,
 linux-mm@kvack.org, stable@vger.kernel.org
Subject: Re: [PATCH] userfaultfd: prevent registration of special VMAs
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On Fri, 3 Jul 2026 14:38:56 +0100 Lorenzo Stoakes <ljs@kernel.org> wrote:

> On Fri, Jul 03, 2026 at 04:20:37PM +0300, Mike Rapoport wrote:
> > On Fri, Jul 03, 2026 at 11:11:14AM +0100, Lorenzo Stoakes wrote:
> > > On Thu, Jun 18, 2026 at 11:37:10AM +0200, David Hildenbrand (Arm) wrote:
> > > > > In a way that's an extra check for hugetlb, but it will work.
> > > >
> > > > My point would be that we exclude all special VMAs, except hugetlb (which is
> > > > special but supported ... in its special way).
> > >
> > > Mike - you said you were respinning, it'd help my series if you respan the above
> > > quickly so I could base my change on that :).
> >
> > I sent it already:
> >
> > https://lore.kernel.org/all/20260618095017.2553004-1-rppt@kernel.org
> >
> > and Andrew apparently ook it:
> >
> > https://lore.kernel.org/all/20260618183442.BBCD71F000E9@smtp.kernel.org
> 
> It's not anywhere :)
> 
> Andrew - did you take that thread as signal this should not go in?
> 
> It should definitely go in. I will clean up the mess discussed there separately.

Thanks, yes, I added it then hid it when Linus objected.  I'll unhide
it now.