Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6

* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
  [PATCH] Use early clobber in semaphores
  [PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it
  [PATCH] Re-positioning the bss segment
  [PATCH] Use ARRAY_SIZE in setup.c
  [PATCH] i386: replace intermediate array-size definitions with ARRAY_SIZE()
  [PATCH] x86: Clean up x86 NMI sysctls
  [PATCH] Refactor some duplicated code in mpparse.c
  [PATCH] Document iommu=panic
  [PATCH] Fix broken indentation in iommu_setup
  [PATCH] Allow disabling DAC using command line options
  [PATCH] Add proper sparse __user casts to __copy_to_user_inatomic
  [PATCH] i386: Update defconfig
  [PATCH] Update defconfig

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 4303e0c12476..74b77f9e91bc 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -199,6 +199,11 @@ IOMMU
    allowed  overwrite iommu off workarounds for specific chipsets.
    soft  Use software bounce buffering (default for Intel machines)
    noaperture Don't touch the aperture for AGP.
+   allowdac Allow DMA >4GB
+            When off all DMA over >4GB is forced through an IOMMU or bounce
+            buffering.
+   nodac    Forbid DMA >4GB
+   panic    Always panic when IOMMU overflows
 
   swiotlb=pages[,force]