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b=Rez6gWytpa46FR5MaQj+eFH7x+37KxShAIV9jQ4YyOYt6s8w5g8GgQtNu940wrHOX hnpReiw6vr9TsK2VaGWJKo0vSkacJRDktv8nbsI6CRaDG16Vp01fkHT93/GaR4sjQp agbeoqpaPFI82E5mBj4t0emDIiJs7SwLNBrasu8E= Date: Mon, 24 Nov 2025 10:08:16 -0800 From: Andrew Morton To: "David Hildenbrand (Red Hat)" Cc: Balbir Singh , Catalin Marinas , "David Hildenbrand (Red Hat)" , Jan Polensky , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, will@kernel.org Subject: Re: [PATCH] mm/huge_memory: restrict __GFP_ZEROTAGS to HW tagging architectures Message-Id: <20251124100816.a4f16b6a84bae7c97dfc21fb@linux-foundation.org> In-Reply-To: References: <20251031170133.280742-1-catalin.marinas@arm.com> <20251109003613.1461433-1-japo@linux.ibm.com> <690ce196-58cb-4252-ab72-967e1e1574cf@gmail.com> <9ab7f5c8-a2fd-497b-a32e-4def84e0be26@nvidia.com> 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-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3B777180012 X-Stat-Signature: 1nh1p8w6u5um5b961bz4pc48hn1cgiic X-Rspam-User: X-HE-Tag: 1764007698-679452 X-HE-Meta: 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 kAkA/5pX durK1JXfqGrv7Qdm9sP03djoiOyNCzjHxXayDJHheuxJBKNbiIE8pPqtV9LGj6A92NcCle/XYr/I32R6f95WKFINZjh+2/p6uXVlBEyjO5yabI9MkS4KrWISEEx5QyumDPNerUX9RimyTxQH0XUe2iAJH5fbYHGHFdNXZAFwN9/6iEyNqcRllX6uxhGWrBoi62wYazstbXi4gR2Qo6bEuuGmAG6yG6izeftarRWMSw3SgS12MNxrFjLq4WaNdsfbQe29h6mEN0dUK1Yc6T34UzuxLYeh+K7fon/1rAo4iUn7LN0cyJgfzXIWcijIRhMmfC1z4nvYpks+4qJb7h9tN4EtTyk3Fz+hXvQB0S6N+e3LD4azSuUxX3XoD1IvzV9CH1ERl X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 24 Nov 2025 11:57:09 +0100 "David Hildenbrand (Red Hat)" wrote: > > I've run into the issue where due to init being set to false if zero_tags was set, > > the system does not clear the zero_folio. I just spent a lot of time debugging it :) > > > > Catalin, were you going to send out this patch as a fix to be included in mm-unstable? > > I've for now reverted your __GFP_ZEROTAGS change to get_huge_zero_folio() for my testing > > > > I am on the current mm-new branch. > > We have a fix upstream now: > > commit 5bebe8de19264946d398ead4e6c20c229454a552 > Author: Linus Torvalds > Date: Tue Nov 18 08:21:27 2025 -0800 > > mm/huge_memory: Fix initialization of huge zero folio > > > Andrew could consider picking it up as well temporarily to fix the issue > until we rebase on top of the new kernel. Sure, I added 5bebe8de19264946d398ead4e6c20c229454a552 to mm-new as a temp thing.