use generic DMA mapping code in powerpc V4

[Christoph Hellwig]

On Thu, Nov 29, 2018 at 01:05:23PM +0100, Christian Zigotzky wrote:
> I compiled a test kernel from the following Git today.
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.4
>
> Command: git clone git://git.infradead.org/users/hch/misc.git -b 
> powerpc-dma.4 a
>
> Unfortunately I get some DMA error messages and the PASEMI ethernet doesn't 
> work anymore.

What kind of machine is this (and your other one)?  Can you send me
(or point me to) the .config files?