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[73.95.159.87]) by smtp.gmail.com with ESMTPSA id t19sm91323213iog.41.2019.08.13.09.48.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Aug 2019 09:48:44 -0700 (PDT) Date: Tue, 13 Aug 2019 09:48:43 -0700 (PDT) From: Paul Walmsley X-X-Sender: paulw@viisi.sifive.com To: Logan Gunthorpe cc: Greentime Hu , Rob Herring , Albert Ou , Andrew Waterman , Palmer Dabbelt , Linux Kernel Mailing List , Stephen Bates , Olof Johansson , greentime.hu@sifive.com, linux-riscv@lists.infradead.org, Michael Clark , Christoph Hellwig , linux-mm@kvack.org Subject: Re: [PATCH v4 2/2] RISC-V: Implement sparsemem In-Reply-To: Message-ID: References: <20190109203911.7887-1-logang@deltatee.com> <20190109203911.7887-3-logang@deltatee.com> <0926a261-520e-4c40-f926-ddd40bb8ce44@deltatee.com> <96156909-1453-d487-ff66-a041d67c74d6@deltatee.com> <5506c875-9387-acc9-a7fe-5b7c10036c40@deltatee.com> User-Agent: Alpine 2.21.9999 (DEB 301 2018-08-15) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII 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: On Tue, 13 Aug 2019, Paul Walmsley wrote: > On Tue, 13 Aug 2019, Logan Gunthorpe wrote: > > > On 2019-08-13 12:04 a.m., Greentime Hu wrote: > > > > > Every architecture with mmu defines their own pfn_valid(). > > > > Not true. Arm64, for example just uses the generic implementation in > > mmzone.h. > > arm64 seems to define their own: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/Kconfig#n899 > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/mm/init.c#n235 > > While there are many architectures which have their own pfn_valid(); > oddly, almost none of them set HAVE_ARCH_PFN_VALID ? (fixed the linux-mm@ address) - Paul