Re: [PATCH 0/3] Add API for weak DMA masks

[Christoph Hellwig]

On Thu, May 01, 2008 at 05:47:26PM +0200, Michael Buesch wrote:
> We've discussed that and this behaviour is not acceptable, as the driver
> must know about a possible fallback in case it can do 32bit DMA
> more efficiently than 64bit DMA, for example.

That's what we have dma_get_required_mask() for.  See
Documentation/DMA-API.txt.

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