Merge branch 'stable/for-linus-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb updates from Konrad Rzeszutek Wilk:

 - minor fixes (rate limiting), remove certain functions

 - support for DMA_ATTR_SKIP_CPU_SYNC which is an optimization
   in the DMA API

* 'stable/for-linus-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: Minor fix-ups for DMA_ATTR_SKIP_CPU_SYNC support
  swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC
  swiotlb-xen: Enforce return of DMA_ERROR_CODE in mapping function
  swiotlb: Drop unused functions swiotlb_map_sg and swiotlb_unmap_sg
  swiotlb: Rate-limit printing when running out of SW-IOMMU space