[PATCH] x86_64: Make GART_IOMMU kconfig help text more specific (trivial)

Have the GART_IOMMU help text specify that this is the hardware IOMMU in
amd64 processors.  This will be significant if/when other IOMMUs are
added to the x86-64 architecture. :-)

Also, note that the previous help text stated that IOMMU was needed for
>3GB memory instead of >4GB.  This is fixed in the newer version.

Signed-off-by: Jon Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 7 deletions

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 31bab721cb71..6420baeb8c1f 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -364,13 +364,15 @@ config GART_IOMMU
         select SWIOTLB
         depends on PCI
         help
-          Support the IOMMU. Needed to run systems with more than 3GB of memory
-          properly with 32-bit PCI devices that do not support DAC (Double Address
-          Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
-          Normally the kernel will take the right choice by itself.
-          This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
-          and a software emulation used on other systems.
-          If unsure, say Y.
+          Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
+          and for the bounce buffering software IOMMU.
+          Needed to run systems with more than 3GB of memory properly with
+          32-bit PCI devices that do not support DAC (Double Address Cycle).
+          The IOMMU can be turned off at runtime with the iommu=off parameter.
+          Normally the kernel will take the right choice by itself.
+          This option includes a driver for the AMD Opteron/Athlon64 IOMMU
+          northbridge and a software emulation used on other systems without
+          hardware IOMMU.  If unsure, say Y.
 
 # need this always enabled with GART_IOMMU for the VIA workaround
 config SWIOTLB