use generic DMA mapping code in powerpc V4

[Rui Salvaterra]

Christoph Hellwig <hch at lst.de> writes:
> Any comments?  I'd like to at least get the ball moving on the easy
> bits.

Hi, Christoph,

I'm sorry, but this series makes nouveau my Power Mac G5 very unhappy.
Dmesg and .config attached.
Let me know if you need anything else to help you debug this, I'm
happy to help with testing.

Thanks,
Rui
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