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Alpha doesn't need struct *page and can perform mapping based on physical addresses. So convert it to implement new .map_phys callback. As part of this change, remove useless BUG_ON() as DMA mapping layer ensures that right direction is provided. Tested-by: Magnus Lindholm <linmag7@gmail.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20251015-remove-map-page-v5-7-3bbfe3a25cdf@kernel.org