add support for the global coherent pool to the dma core

['Christoph Hellwig']

On Wed, Jul 28, 2021 at 10:20:34AM -0500, Brian Cain wrote:
> > this series adds support for using the global coherent (aka uncached)
> > pool to the generic dma-direct code and then switches arm-nommu and
> > hexagon over to it, together with a bunch of cleanups.
> 
> Christoph,
> 
> Thanks for sending this -- I will take a look and give some feedback soon.

Any chance you'll get to this in the next days?  I'd love to merge this
series for the current merge window with a little time in linux-next.