RFC: switch to use the generic remapping dma-allocator

[Christoph Hellwig <hch@lst.de>]

Hi all,

currently parisc has it's own implementation of the dma-coherent
allocator that sets up PTEs with the uncached bit.  I can't see any
reason why using vmap to do the same kind of setup shouldn't work.
This small series shows how that could work, but due to a lack of
actual parisc hardware it is compile tested only and not only needs
a careful review but also actual testing on hardware.

Diffstat:
 arch/parisc/Kconfig               |    4 
 arch/parisc/include/asm/pgtable.h |    1 
 arch/parisc/kernel/pci-dma.c      |  446 +-------------------------------------
 include/linux/dma-map-ops.h       |    1 
 kernel/dma/Kconfig                |    3 
 kernel/dma/direct.c               |    4 
 6 files changed, 24 insertions(+), 435 deletions(-)