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Wed, 22 Jul 2026 12:59:13 -0700 (PDT) Received: from ziepe.ca ([216.228.115.8]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13d13003f12sm14809771c88.2.2026.07.22.12.59.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jul 2026 12:59:12 -0700 (PDT) Received: from jgg by NV-9X0Z6D3.localdomain with local (Exim 4.97) (envelope-from ) id 1wmd60-000000002O0-1hvF; Wed, 22 Jul 2026 16:59:12 -0300 Date: Wed, 22 Jul 2026 16:59:12 -0300 From: Jason Gunthorpe To: Leon Romanovsky Cc: "Aneesh Kumar K.V" , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Robin Murphy , Marek Szyprowski , 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, stable@vger.kernel.org, Michael Kelley Subject: Re: [PATCH v8 01/23] dma-direct: return struct page from dma_direct_alloc_from_pool() Message-ID: References: <20260717180442.110954-1-aneesh.kumar@kernel.org> <20260717180442.110954-2-aneesh.kumar@kernel.org> <20260721115456.GI110966@unreal> <20260721142921.GN110966@unreal> <20260721153321.GO110966@unreal> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260721153321.GO110966@unreal> On Tue, Jul 21, 2026 at 06:33:21PM +0300, Leon Romanovsky wrote: > Something like, but probably void* needs to be phys_addr_t: > > static inline struct page *dma_phys_to_page(void *addr) > { > #ifdef CONFIG_DMA_DIRECT_REMAP > return vmalloc_to_page(addr); > #else > return virt_to_page(addr); > #endif > } I don't like this, we don't know for sure the addr will be in a vmap and this will fail if it isn't. Jason