Commit 5d05f4de authored by Jon Mason's avatar Jon Mason Committed by Linus Torvalds

[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: default avatarJon Mason <jdmason@us.ibm.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ba22f135
......@@ -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.
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 northbridge IOMMU
and a software emulation used on other systems.
If unsure, say Y.
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
......
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