dma-pool fixes

[Christoph Hellwig]

On Fri, Jul 31, 2020 at 12:04:28PM -0700, David Rientjes wrote:
> On Fri, 31 Jul 2020, Christoph Hellwig wrote:
> 
> > > Hi Nicolas, Christoph,
> > > 
> > > Just out of curiosity, I'm wondering if we can restore the earlier
> > > behaviour and make DMA atomic allocation configured thru platform
> > > specific device tree instead?
> > > 
> > > Or if you can allow a more hackish approach to restore the earlier
> > > logic, using of_machine_is_compatible() just for my device for the
> > > time being. Meanwhile I'm checking with other developers running the
> > > mainline kernel on sdm845 phones like OnePlus 6/6T, if they see this
> > > issue too.
> > 
> > If we don't find a fix for your platform I'm going to send Linus a
> > last minute revert this weekend, to stick to the no regressions policy.
> > I still hope we can fix the issue for real.
> > 
> 
> What would be the scope of this potential revert?

I've just looked into that and it seems like we need to revert everything
pool related back ot "dma-pool: add additional coherent pools to map to gfp
mask".