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[2003:d8:2f31:700:3851:c66a:b6b9:3490]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a568a54a36sm13644198f8f.15.2025.06.17.02.36.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Jun 2025 02:36:47 -0700 (PDT) Message-ID: <911e7b40-e30e-477f-a4e5-df34df1d0e14@redhat.com> Date: Tue, 17 Jun 2025 11:36:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 11/14] mm: Remove devmap related functions and page table bits To: Alistair Popple , akpm@linux-foundation.org Cc: linux-mm@kvack.org, gerald.schaefer@linux.ibm.com, dan.j.williams@intel.com, jgg@ziepe.ca, willy@infradead.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, zhang.lyra@gmail.com, debug@rivosinc.com, bjorn@kernel.org, balbirs@nvidia.com, lorenzo.stoakes@oracle.com, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-cxl@vger.kernel.org, dri-devel@lists.freedesktop.org, John@Groves.net, m.szyprowski@samsung.com, Will Deacon , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Jason Gunthorpe References: From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D3E5B80003 X-Stat-Signature: egyrhkhwnj4tdxdz7yk1dcyybfdxhqtk X-Rspam-User: X-HE-Tag: 1750153011-285820 X-HE-Meta: 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 CHpoecyR 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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 16.06.25 13:58, Alistair Popple wrote: > Now that DAX and all other reference counts to ZONE_DEVICE pages are > managed normally there is no need for the special devmap PTE/PMD/PUD > page table bits. So drop all references to these, freeing up a > software defined page table bit on architectures supporting it. > > Signed-off-by: Alistair Popple > Acked-by: Will Deacon # arm64 > Suggested-by: Chunyan Zhang > Reviewed-by: Björn Töpel > Reviewed-by: Jason Gunthorpe > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb