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

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