[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
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -364,13 +364,15 @@
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