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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Balbir Singh , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org Subject: Re: [PATCH v6 1/5] mm/zone_device: Reinitialize large zone device private folios Message-Id: <20260116143432.50b98d6dc965b94f3b915333@linux-foundation.org> In-Reply-To: <20260116111325.1736137-2-francois.dugast@intel.com> References: <20260116111325.1736137-1-francois.dugast@intel.com> <20260116111325.1736137-2-francois.dugast@intel.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=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 74C3918000A X-Stat-Signature: ytbsz9qaae1bhmhjd8e55nxpgqaxeguu X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1768602875-725142 X-HE-Meta: U2FsdGVkX19GSqkAJ7tY2Um/+X6LLDZyH+AcDXU8PGk62bKGJzFD+5uCPgK5N9DoK3A2HIQndvwtQWEmQBXcDK6Gn8so20g7maTSiwDJDq4ZvYrWks6P3+i2sn2W+12yF4s/ZljFAxI53C3YmE8VXVtrwGf3tm29xL0RJYlWWJ8F+E6CqqiJAL4cIez1PFmFNKMCvbMLNPjdPkdImg+Rcy2DYNKyVaQ5k10VAH3SJXMtpeqjnXODglccFSxKXYmjFwSbaiVLRi4pLaPiRbxPNZlx159XZgyj/pHh+iGKdRu5rJO6Q1za3tKK5yD1+2ONHiLuZLWW7RVzT1RfgJkJbe3lWyGa5z6qFc/e6YJndyvna0pQwuX1RS1dKyD48obPb6iGAeFNFo/krvg/QpgeZY0Piu7BzVvUzhode4aaMAYWHuwMXtSqFkk0eJ7+FL/CtCOPoXMvE6ZPyFjFFVeFkBudreOW16R6BoFAx9jLLeWYQ8b0h2w/zJfr3QuV7DRxREVzTP4Walj+nkUibnOm+dCifDtwf9mS/zTcM/MVdOkkFDtoWRZfuPAaRJ9iV8GD7ppMFuqv6+BGydDYeVA2YY165h0B7uxw7yFG/qQgSztYonIYA5NMrR5mqrgw2xrEvsW9YddPe9ZEqJCtVAHmNivdY5Mr79XQkI/x9XEdjB0nVUyM0wnSU1M4/Lkvkh3vjmlu3RtGPZAvzsyeMQUUhho5FrNfQawi+4E2L4e7gipCuKqKRP9g6TcGQ9LhBTfBc45bujxbD86oMwi6PFIhOhfxctGF1aEzOnHdUGlFjPDNlsLtT+BaG2PJNQW5RxcxlZRUwuYGDx7Z65aRZ3ephESvrbp6qCJ0rrL8cSp2lcABqZCXxQ1Ze/I2OLz6C+XZjevb6rWi0bQazvH0Vx3+ebbGm4yfekFI9xy2OA6Ln+bZcSUvMTClNjE+214tvpM+jTUxKmaySSSVk99mLyc gBbI3Fmv hgVgl 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 Fri, 16 Jan 2026 12:10:16 +0100 Francois Dugast wrote: > Reinitialize metadata for large zone device private folios in > zone_device_page_init prior to creating a higher-order zone device > private folio. This step is necessary when the folio’s order changes > dynamically between zone_device_page_init calls to avoid building a > corrupt folio. As part of the metadata reinitialization, the dev_pagemap > must be passed in from the caller because the pgmap stored in the folio > page may have been overwritten with a compound head. > > Without this fix, individual pages could have invalid pgmap fields and > flags (with PG_locked being notably problematic) due to prior different > order allocations, which can, and will, result in kernel crashes. Is it OK to leave 6.18.x without this fixed?