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[2003:d8:2f0d:f000:eec9:2b8d:4913:f32a]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3a4f009fd7csm19308738f8f.88.2025.06.03.14.16.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Jun 2025 14:16:36 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, David Hildenbrand , Andrew Morton , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Dan Williams Subject: [PATCH v1 0/2] mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio_*() Date: Tue, 3 Jun 2025 23:16:32 +0200 Message-ID: <20250603211634.2925015-1-david@redhat.com> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 96AJGPuSE6fMDFcSH0ccL7f4E_5l5bHt53iynsmMsVw_1748985397 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Based on Linus' master. While working on improving vm_normal_page() and friends, I stumbled over this issues: refcounted "normal" pages must not be marked using pmd_special() / pud_special(). Fortunately, so far there doesn't seem to be serious damage. This is only compile-tested so far. Still looking for an easy way to test PMD/PUD mappings with DAX. Any tests I can easily run? Cc: Andrew Morton Cc: Alistair Popple Cc: Lorenzo Stoakes Cc: "Liam R. Howlett" Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Zi Yan Cc: Baolin Wang Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Dan Williams David Hildenbrand (2): mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio_pmd() mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio_pud() include/linux/mm.h | 15 ++++++++++ mm/huge_memory.c | 72 +++++++++++++++++++++++++++++++++++----------- 2 files changed, 70 insertions(+), 17 deletions(-) base-commit: a9dfb7db96f7bc1f30feae673aab7fdbfbc94e9c -- 2.49.0