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Subjecthandle "special" dma allocation in common code
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Hi all,,

this series ensures that the common dma-direct code handles the somewhat
special allocation types requested by the DMA_ATTR_NON_CONSISTENT and
DMA_ATTR_NO_KERNEL_MAPPING flags directly. To do so it also removes three
partial and thus broken implementations of DMA_ATTR_NON_CONSISTENT. Last
but not least it switches arc to use the generic dma remapping code now
that arc doesn't implement any special behavior.

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