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For architectures that do not use per-device dma ops we need to export
the dma_map_ops structure returned from get_arch_dma_ops().
Fixes: 10314e09 ("riscv: add swiotlb support")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Andreas Schwab <schwab@suse.de>