This patchset adds a trivial helper function, is_buffer_dma_capable()
and cleans up some IOMMU implementations. This function is to to see
if a memory region is DMA-capable or not with the arguments, the
dma_mask (or coherent_dma_mask) of a device and the address and size
of a memory region. It's useful for IOMMUs that don't do virtual
mappings at all times.

The patch for swiotlb is a bug fix (the rest are just
cleanups). Currently, swiotlb doesn't take account of the size of a
memory region to see if if the memory region is DMA-capable.

=
 arch/x86/kernel/pci-gart_64.c |   16 +++-------------
 arch/x86/kernel/pci-nommu.c   |   10 ++++++----
 include/linux/dma-mapping.h   |    5 +++++
 lib/swiotlb.c                 |   15 ++++++++-------
 4 files changed, 22 insertions(+), 24 deletions(-)


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