[RFC PATCH 2/2] dma-mapping: Clean up dma_get_required_mask() hooks

[Robin Murphy]

On 05/07/18 20:38, Christoph Hellwig wrote:
> On Wed, Jul 04, 2018 at 06:50:12PM +0100, Robin Murphy wrote:
>> As for the other mask-related hooks, standardise the arch override into
>> a Kconfig option, and also pull the generic implementation into the DMA
>> mapping code rather than having it hide away in the platform bus code.
> 
> Heh, I have a somewhat similar patch in my queue.  I didn't want it out
> because dma_get_required_mask is rather ill defined at the moment and
> I wanted to clean that up first.  But I guess I could apply this first
> and clean up later.
> 
> I just fear you might be wanting to add an arm64 user, so I'd really like
> to understand why and how.

Nah, this guy is just pure cleanup since it also fell out of my 'git 
grep ARCH_HAS_DMA'

Robin.