Re: [PATCH 28/44] sparc: remove arch specific dma_supported implementations

From: Christoph Hellwig
Date: Fri Jun 16 2017 - 04:47:11 EST

On Fri, Jun 09, 2017 at 12:22:48AM +1000, Julian Calaby wrote:
> I'm guessing there's a few places that have DMA ops but DMA isn't
> actually supported. Why not have a common method for this, maybe
> "dma_not_supported"?

It's not common at all. Except for sbus all dma API user first
call set_dma_mask which ends up in the dma_supported call. sbus
is the weird outlier here.