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Wed, 22 Jul 2026 12:57:11 -0700 (PDT) Received: from ziepe.ca ([216.228.115.8]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3147dc6162csm11833170eec.7.2026.07.22.12.57.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jul 2026 12:57:10 -0700 (PDT) Received: from jgg by NV-9X0Z6D3.localdomain with local (Exim 4.97) (envelope-from ) id 1wmd42-000000002HD-06RY; Wed, 22 Jul 2026 16:57:10 -0300 Date: Wed, 22 Jul 2026 16:57:09 -0300 From: Jason Gunthorpe To: Leon Romanovsky Cc: "Aneesh Kumar K.V (Arm)" , Marek Szyprowski , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Robin Murphy , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Mostafa Saleh , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org Subject: Re: [PATCH v8 00/23] dma-mapping: Track shared DMA state through direct, pool and swiotlb paths Message-ID: References: <20260717180442.110954-1-aneesh.kumar@kernel.org> <20260721124056.GK110966@unreal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260721124056.GK110966@unreal> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260722_125712_281916_E999A514 X-CRM114-Status: UNSURE ( 9.84 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Jul 21, 2026 at 03:40:56PM +0300, Leon Romanovsky wrote: > Why don't we continue the effort to remove "struct page" entirely > from the DMA API internals? > > IMHO, everything not exposed to DMA API users should use > phys_addr_t, including the DMA address pool. The alloc interfaces return a struct page, that is why this stuff is organized like this. Look at dma_alloc_pages() There is also an API that forms a scatterlist that has to be struct page as well Jason