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Subject[patch 17/85] x86: default to SWIOTLB=y on x86_64
2.6.27-stable review patch.  If anyone has any objections, please let us know.


From: Joerg Roedel <>

commit a1afd01c175324656d0e8f1c82ea94b474953c04 upstream.

Impact: fixes korg bugzilla 11980

A kernel for a 64bit x86 system should always contain the swiotlb code
in case it is booted on a machine without any hardware IOMMU supported
by the kernel and more than 4GB of RAM. This patch changes Kconfig to
always compile swiotlb into the kernel for x86_64.

Signed-off-by: Joerg Roedel <>
Signed-off-by: Ingo Molnar <>
Signed-off-by: Greg Kroah-Hartman <>

arch/x86/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -567,7 +567,7 @@ config AMD_IOMMU

# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
- bool
+ def_bool y if X86_64
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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