From: Jon Mason Date: Sat, 25 Mar 2006 15:31:34 +0000 (+0100) Subject: [PATCH] x86_64: Make GART_IOMMU kconfig help text more specific (trivial) X-Git-Tag: v2.6.17-rc1~679 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d05f4de414c98348219b633401ad9c9a5348a8b;p=linux-2.6 [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 Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 31bab721cb..6420baeb8c 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