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Subject[PATCH 0/7] x86 dma_*_coherent rework patchset

this patchset reworks the dma_*_coherent functions in the DMA layer for the x86
architecture. The patch series extends the existing DMA backends with missing
*coherent callbacks and simplifies the generic function to basically only call
the registered backend. This allows future optimizations in hardware specific
IOMMU implementations.
The code ist tested on AMD64 with AMD IOMMU and GART as well as on my old 486
box. It is not yet tested on a Calgary IOMMU system.


git diff --stat tip/master:

arch/x86/kernel/amd_iommu.c | 2 -
arch/x86/kernel/pci-calgary_64.c | 14 +++++
arch/x86/kernel/pci-dma.c | 116 +++----------------------------------
arch/x86/kernel/pci-gart_64.c | 31 ++++++++++
arch/x86/kernel/pci-nommu.c | 45 +++++++++++++++
5 files changed, 100 insertions(+), 108 deletions(-)

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