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This is a preparation of struct dma_mapping_ops unification. We use map_page and unmap_page instead of map_single and unmap_single. We will remove map_single and unmap_single hooks in the last patch in this patchset. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>