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[217.140.110.172]) by mx.google.com with ESMTP id qc1si6918683ejb.59.2019.07.01.02.44.21 for ; Mon, 01 Jul 2019 02:44:21 -0700 (PDT) Received-SPF: pass (google.com: domain of catalin.marinas@arm.com designates 217.140.110.172 as permitted sender) client-ip=217.140.110.172; Authentication-Results: mx.google.com; spf=pass (google.com: domain of catalin.marinas@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=catalin.marinas@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E1E752B; Mon, 1 Jul 2019 02:44:20 -0700 (PDT) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 727AD3F718; Mon, 1 Jul 2019 02:44:19 -0700 (PDT) Date: Mon, 1 Jul 2019 10:44:17 +0100 From: Catalin Marinas To: Nicholas Piggin Cc: "linux-mm @ kvack . org" , "linux-arm-kernel @ lists . infradead . org" , "linuxppc-dev @ lists . ozlabs . org" , Andrew Morton , Anshuman Khandual , Christophe Leroy , Ard Biesheuvel , Mark Rutland , Will Deacon , Steven Price Subject: Re: [PATCH v2 1/3] arm64: mm: Add p?d_large() definitions Message-ID: <20190701094417.GB21774@arrakis.emea.arm.com> References: <20190701064026.970-1-npiggin@gmail.com> <20190701064026.970-2-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190701064026.970-2-npiggin@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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 Mon, Jul 01, 2019 at 04:40:24PM +1000, Nicholas Piggin wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information will be provided by the > p?d_large() functions/macros. > > For arm64, we already have p?d_sect() macros which we can reuse for > p?d_large(). > > pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3 > or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is > configured this way then architecturally it isn't allowed to have a > large page that this level, and any code using these page walking macros > is implicitly relying on the page size/number of levels being the same as > the kernel. So it is safe to reuse this for p?d_large() as it is an > architectural restriction. > > Cc: Catalin Marinas > Cc: Will Deacon > Signed-off-by: Steven Price Acked-by: Catalin Marinas