Christoph Hellwig 13bf5ced93 dma-mapping: add a Kconfig symbol to indicate arch_dma_prep_coherent presence ...

Add a Kconfig symbol that indicates an architecture provides a
arch_dma_prep_coherent implementation, and provide a stub otherwise.

This will allow the generic dma-iommu code to use it while still
allowing to be built for cache coherent architectures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

2019-05-06 15:04:40 +02:00

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