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[2003:cb:c734:b800:12c4:65cd:348a:aee6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38dbde1dfaesm13124217f8f.90.2025.02.10.10.43.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Feb 2025 10:43:23 -0800 (PST) Message-ID: Date: Mon, 10 Feb 2025 19:43:20 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 15/20] huge_memory: Add vmf_insert_folio_pud() To: Alistair Popple , akpm@linux-foundation.org, dan.j.williams@intel.com, linux-mm@kvack.org Cc: Alison Schofield , lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com, chenhuacai@kernel.org, kernel@xen0n.name, loongarch@lists.linux.dev References: From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 851FD8000B X-Rspamd-Server: rspam07 X-Stat-Signature: 6yabrdedqodj8xbr9kni1utax1hea8gj X-HE-Tag: 1739213010-24078 X-HE-Meta: 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 fll0GE3o 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 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 04.02.25 23:48, Alistair Popple wrote: > Currently DAX folio/page reference counts are managed differently to > normal pages. To allow these to be managed the same as normal pages > introduce vmf_insert_folio_pud. This will map the entire PUD-sized folio > and take references as it would for a normally mapped page. > > This is distinct from the current mechanism, vmf_insert_pfn_pud, which > simply inserts a special devmap PUD entry into the page table without > holding a reference to the page for the mapping. > > Signed-off-by: Alistair Popple > Reviewed-by: Dan Williams > Nit: patch subject should start with "mm/huge_memory:" Acked-by: David Hildenbrand -- Cheers, David / dhildenb