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b=1r3H7rexoiQDRjGFt+Qjs33P1gVqh+LD73TOTn/BTY0t13tL4G1XibQWtwbBNLJiy /AbaYonfCEjLrKKi9OkCqN7wL49L3MbO1BuGftrDMhCvBcwuagImS8gD8y1Sf6ehPP UGSpFne62asm/Cvv+3d9/HGQrxu5PpvI24+a2L/o= Date: Sun, 5 Jul 2026 00:51:24 -0700 From: Andrew Morton To: Lorenzo Stoakes Cc: Mike Rapoport , "David Hildenbrand (Arm)" , Linus Torvalds , Alexander Viro , Christian Brauner , Jan Kara , Oleg Nesterov , Peter Xu , vova tokarev , linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org Subject: Re: [PATCH] userfaultfd: prevent registration of special VMAs Message-Id: <20260705005124.307e2379ab03109e5f77bd1c@linux-foundation.org> In-Reply-To: References: <5a993689-f730-406d-8515-8bb6025cc851@kernel.org> <41ef0dce-e973-4947-b5e3-150fdb07f1a6@kernel.org> <11bae87d-73e6-4946-a41f-c5542fb40b75@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B40D240003 X-Stat-Signature: q73nmepk8on54iq8w93uhwbo5cjkxp8k X-HE-Tag: 1783237886-701015 X-HE-Meta: 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 77eSgYrE u06nFG4IUIu7+iv3yutSIU1v87IzvDbhSWHADRNjnay0pawB4ubp7wvGv8qVTMlYSRsB4jADp/X3HZnxWMmORVt0I/SMcjYqRPtLZTGDiABFzRTncqaAzJqHuPznNFbbgJxszXxLXONdtI/oMeHSqyCRvLMUBW7IGMW3EtGtXpCBm2ETjf+QxLCjsivT08mMWLbyAztiUbd4ePqSAeHlqjDkgYRUDyM+gIzezsg/vAi18mZCVtFxwYRSlKx2eCkVfMI5gBkG2o8JTJ5H8Ygq70upn0w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 3 Jul 2026 14:38:56 +0100 Lorenzo Stoakes 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.