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Subjectuse generic DMA mapping code in powerpc V4
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Hi all,

this series switches the powerpc port to use the generic swiotlb and
noncoherent dma ops, and to use more generic code for the coherent
direct mapping, as well as removing a lot of dead code.

As this series is very large and depends on the dma-mapping tree I've
also published a git tree:

git://git.infradead.org/users/hch/misc.git powerpc-dma.4

Gitweb:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.4

Changes since v3:
- rebase on the powerpc fixes tree
- add a new patch to actually make the baseline amigaone config
configure without warnings
- only use ZONE_DMA for 64-bit embedded CPUs, on pseries an IOMMU is
always present
- fix compile in mem.c for one configuration
- drop the full npu removal for now, will be resent separately
- a few git bisection fixes

The changes since v1 are to big to list and v2 was not posted in public.

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