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

On 05/07/18 20:38, Christoph Hellwig wrote:

On Wed, Jul 04, 2018 at 06:50:12PM +0100, Robin Murphy wrote:

quoted

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.