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b=XsDoAPbDuJawip0mO7VPHOcAtC8umkEX+3mruYsdiHMQTMSnCjk6khCQQhBFOVU2q szsII3oJXeXPXn/TD1fBgYjrRriwN7ffC0ijh8PvFS/JWshQeFdlZKBesvFDDo5JNp ebFxkePURnK0zM1B3jsYHT4MNNEkTpuSUbDOJ0wqE7eJfaQfSWxRo0vWoC5QTabCIW I9ZALOcwRGl2VBpOZP15lKg6qpE8NWgViVA291vGz6q0ajZOlvg0o3swDvw0f3PyCc eOMz086l52tHH0De4Ngoa9ZI+DYKXoJrjaUifAz9HtEFirAu5kGY4AnRE4k3HNrj2S wF50L1Ci27E9g== Date: Mon, 8 Jul 2024 12:35:25 +0100 From: Will Deacon To: Alistair Popple Cc: dan.j.williams@intel.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, 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, david@redhat.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-mm@kvack.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com Subject: Re: [PATCH 13/13] mm: Remove devmap related functions and page table bits Message-ID: <20240708113524.GD11567@willie-the-truck> References: <47c26640cd85f3db2e0a2796047199bb984d1b3f.1719386613.git-series.apopple@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47c26640cd85f3db2e0a2796047199bb984d1b3f.1719386613.git-series.apopple@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Stat-Signature: pqwi8sk5ajkyzeqfn7z3zb4qa7iueoyn X-Rspamd-Queue-Id: 6390E4001B X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1720438535-454922 X-HE-Meta: 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 N3aI3Mg0 LpdAqmOtroF/3k/gXHec25va0Bl2ofGdoajSc6KOJvGpR8gSGCCsON+PlHADtHvGmAJZL+UAJDFBRD/9q3EY0sh86dZToGFTHHRh1VigY8Z6CvYIiFdXj9XZd62Vmk/uGqIfIeWGnmXDz+Jzh3LnsgvSkwe5cpAknTxemeoG9J4UQuvD7MjhGuNrUlhWtUbTH0HIFdftzoeW3Agb6smbGg3y8l44UDhxyE31MWBZnbLvPmKl0eIOw9dYx7eFzb1dBQINM+zcBSlQfExU= 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 Thu, Jun 27, 2024 at 10:54:28AM +1000, 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 > --- > Documentation/mm/arch_pgtable_helpers.rst | 6 +-- > arch/arm64/Kconfig | 1 +- > arch/arm64/include/asm/pgtable-prot.h | 1 +- > arch/arm64/include/asm/pgtable.h | 24 +-------- Not only do you exclusively remove code, but you also give us back a pte bit! What's not to like? Acked-by: Will Deacon # arm64 Will