s390: Implement dma_{alloc,free}_attrs()
The S390 architecture advertises support for HAVE_DMA_ATTRS when PCI is enabled. Patches to unify some of the DMA API would like to rely on the dma_alloc_attrs() and dma_free_attrs() functions to be provided when an architecture supports DMA attributes. Rename dma_alloc_coherent() and dma_free_coherent() to dma_alloc_attrs() and dma_free_attrs() since they are functionally equivalent and alias the former to the latter for compatibility. For consistency with other architectures, also reuse the existing symbol HAVE_DMA_ATTRS defined in arch/Kconfig instead of providing a duplicate. Select it when PCI is enabled. While at it, drop a redundant 'default n' from the PCI Kconfig symbol. Signed-off-by: NThierry Reding <treding@nvidia.com> Acked-By: NSebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
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