[PATCH 2.6.28-rc3] x86: make CONFIG_SWIOTLB configurable

[Constantin Baranov]

Make it possible to enable individually the CONFIG_SWIOTLB option.
This is useful for Intel x86_64 systems without DMAR support.

Signed-off-by: Constantin Baranov <const@xxxxxxxx>
---
Tested on my system based on Gigabyte GA-EP45-DS3 mainboard
(P45 chipset) with 8 GiB of RAM.
Currently I need to enable either CONFIG_GART_IOMMU or
CONFIG_AMD_IOMMU for proper work. Both are AMD specific.
When the patch applied, just CONFIG_SWIOTLB is sufficient.

 arch/x86/Kconfig |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- linux-2.6.28-rc3/arch/x86/Kconfig	2008-11-04 17:32:29.846408880 +0400
+++ linux-2.6.28-rc3-swiotlb/arch/x86/Kconfig	2008-11-04 18:11:47.796408084 +0400
@@ -566,7 +566,9 @@ config AMD_IOMMU
 
 # need this always selected by IOMMU for the VIA workaround
 config SWIOTLB
-	bool
+	bool "Support for software bounce buffers"
+	depends on X86_64 && EXPERIMENTAL
+	default n
 	help
 	  Support for software bounce buffers used on x86-64 systems
 	  which don't have a hardware IOMMU (e.g. the current generation
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