Re: [PATCH 8/9] ARM: integrate CMA with DMA-mapping subsystem

Arnd Bergmann
2011-08-16T13:15:39Z

On Tuesday 16 August 2011, Marek Szyprowski wrote:
> On Friday, August 12, 2011 5:01 PM Arnd Bergmann wrote:

> > How about something like
> >
> > if (arch_is_coherent() || nommu())
> > ret = alloc_simple_buffer();
> > else if (arch_is_v4_v5())
> > ret = alloc_remap();
> > else if (gfp & GFP_ATOMIC)
> > ret = alloc_from_pool();
> > else
> > ret = alloc_from_contiguous();
> >
> > This also allows a natural conversion to dma_map_ops when we get there.
>
> Ok. Is it ok to enable CMA permanently for ARMv6+? If CMA is left conditional
> the dma pool code will be much more complicated, because it will need to support
> both CMA and non-CMA cases.

I think that is ok, yes.

Arnd