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Use the dma_need_sync helper instead of (not always entirely correctly) poking into the dma-mapping internals. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200629130359.2690853-5-hch@lst.de