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Subjectmove swiotlb noncoherent dma support from arm64 to generic code V2
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Hi all,

this series starts with various swiotlb cleanups, then adds support for
non-cache coherent devices to the generic swiotlb support, and finally
switches arm64 to use the generic code.

Given that this series depends on patches in the dma-mapping tree, or
pending for it I've also published a git tree here:

git://git.infradead.org/users/hch/misc.git swiotlb-noncoherent.2

Gitweb:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-noncoherent.2

Changes since v1:
- make sure arm64 always calls dma_direct_alloc_pages to avoid
circular calling conventions
- add a patch in to stop dipping into the swiotlb pool for coherent
allocations - this just depletes the swiotlb pool for no good reason

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