[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>

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 31bab72..6420bae 100644 (file)
--- 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