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These days, the DMA mapping code must bounce buffers for any unsupported address. If the driver needs to optimize for natively supported ranges, then it should use dma_get_required_mask. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Marc Gonzalez <marc.w.gonzalez@free.fr> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>