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swiotlb doesn't use swiotlb_arch_address_needs_mapping(); it uses dma_capalbe(). We can remove unnecessary swiotlb_arch_address_needs_mapping(). We can remove swiotlb_addr_needs_map() and is_buffer_dma_capable() in swiotlb_pci_addr_needs_map() too; dma_capable() handles the features that both provide. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Becky Bruce <beckyb@kernel.crashing.org>