On Fri, Oct 30, 2015 at 01:55:56PM +0100, Christian Borntraeger wrote:
> It not trivial without understanding the dma mask details. Do I read
> the x86 implementation right, that it limits the dma to 32 bit? Then
> we cannot collapse both implementations. Or maybe we can hide this in
> dma_capable. Dont know

No, DMA is not limited to 32bit on x86. Each device has its own
dma_mask, and the requested address+size is checked against it. The
DMA_BIT_MASK(32) check is only to there to print a warning when a 32bit
capable device trys to access memory above 4GB.


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