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dma_default_coherent was decleared unconditionally at kernel/dma/mapping.c but only decleared when any of non-coherent options is enabled in dma-map-ops.h. Guard the declaration in mapping.c with non-coherent options and provide a fallback definition. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>