* David Woodhouse <dwmw2@infradead.org> wrote:

> This contains a few iommu-related fixes -- it restores DMA remapping 
> on newer Intel hardware, which was disabled by the interrupt remapping 
> patches, adds IA64 support for the Intel IOMMU, and some other small 
> fixes.
> 
>  MAINTAINERS                      |    7 +
>  arch/x86/kernel/amd_iommu_init.c |    2 +-
>  arch/x86/kernel/pci-dma.c        |   16 ---
>  drivers/pci/dmar.c               |  119 +++++++++++++-----
>  drivers/pci/intel-iommu.c        |  250 ++++++++++++++++++++------------------
>  drivers/pci/quirks.c             |   14 ++
>  include/asm-x86/iommu.h          |    4 +
>  include/linux/dma_remapping.h    |   27 ++--
>  include/linux/intel-iommu.h      |   66 ++++++++---
>  9 files changed, 305 insertions(+), 200 deletions(-)

hm, i just updated to v2.6.28-rc1, and these changes broke the x86 
32-bit build:

  arch/x86/kernel/built-in.o: In function `dma_supported':
  (.text+0x5797): undefined reference to `forbid_dac'
  arch/x86/kernel/built-in.o: In function `iommu_setup':
  pci-dma.c:(.init.text+0x326c): undefined reference to `forbid_dac'
  pci-dma.c:(.init.text+0x328b): undefined reference to `forbid_dac'
  pci-dma.c:(.init.text+0x32aa): undefined reference to `forbid_dac'

seems to be caused by:

  5b6985c: intel-iommu: IA64 support

config attached. (allnoconfig seems to trigger it too)

	Ingo