unexport swiotlb_active v2

[Christoph Hellwig]

Hi all,

this little series removes the last swiotlb API exposed to modules.

Changes since v1:
 - add a patch from Juergen to export if the e820 table indicates Xen PV
   PCI is enabled
 - slightly reorganize the logic to check if swiotlb is needed for
   Xen/x86
 - drop the already merged nouveau patch

Diffstat:
 arch/x86/include/asm/xen/swiotlb-xen.h |    6 ------
 arch/x86/kernel/pci-dma.c              |   29 +++++++----------------------
 arch/x86/xen/setup.c                   |    6 ++++++
 drivers/pci/xen-pcifront.c             |    6 ------
 include/xen/xen.h                      |    6 ++++++
 kernel/dma/swiotlb.c                   |    1 -
 6 files changed, 19 insertions(+), 35 deletions(-)