[PATCH] drm/etnaviv: select CMA and DMA_CMA if available

[Russell King - ARM Linux]

On Fri, Jul 14, 2017 at 04:38:01PM +0200, Lucas Stach wrote:
> While this is no build dependency, etnaviv will only work correctly on most
> systems if CMA and DMA_CMA are enabled. Select both options if available to
> avoid users ending up with a non-working GPU due to a lacking kernel config.

How does merely selecting CMA solve this problem?  Does CMA guarantee
that GPU command buffers will always be allocated in the lower 2G of
physical address space?

I suspect that's what you hope will happen, rather than a guarantee.

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