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Subject[PATCH] use select for GART_IOMMU to enable AGP

On Thu, 23 Mar 2006, Andrew Morton wrote:

> We suspect the culprit is git-intelfb, which does
> config FB_INTEL
> tristate "Intel 830M/845G/852GM/855GM/865G support (EXPERIMENTAL)"
> - depends on FB && EXPERIMENTAL && PCI && X86_32
> + depends on FB && EXPERIMENTAL && PCI && X86
> select AGP
> select AGP_INTEL
> It's rather nasty that this can break the build.
> It also seems plain wrong to me that a "select AGP" can force CONFIG_AGP=y
> into CONFIG_AGP=m. There's no sense in that.

select and default don't really mix very well, a default is only active if
nothing else enables the symbol, but select already enables here AGP, so
the AGP default isn't needed/used anymore.
It's somewhat related to the other default behaviour, without changing
that I don't see a clean and simple way to change this right now.
The easiest solution is to simply remove the default and let GART_IOMMU
select AGP too.

bye, Roman

The AGP default doesn't work well with other selects, so use a select for
GART_IOMMU as well. Remove a redundant default for SWIOTLB as well.

Signed-off-by: Roman Zippel <>


arch/x86_64/Kconfig | 5 ++---
drivers/char/agp/Kconfig | 3 +--
2 files changed, 3 insertions(+), 5 deletions(-)

Index: linux-2.6-mm/arch/x86_64/Kconfig
--- linux-2.6-mm.orig/arch/x86_64/Kconfig 2006-03-24 01:58:56.000000000 +0100
+++ linux-2.6-mm/arch/x86_64/Kconfig 2006-03-24 12:58:23.000000000 +0100
@@ -389,6 +389,7 @@ config GART_IOMMU
bool "K8 GART IOMMU support"
default y
select SWIOTLB
+ select AGP
depends on PCI
Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
@@ -414,11 +415,9 @@ config CALGARY_IOMMU
will make the right choice by iteself.
If unsure, say Y.

-# need this always enabled with GART_IOMMU for the VIA workaround
+# need this always selected by GART_IOMMU for the VIA workaround
config SWIOTLB
- default y
- depends on GART_IOMMU

config X86_MCE
bool "Machine check support" if EMBEDDED
Index: linux-2.6-git/drivers/char/agp/Kconfig
--- linux-2.6-git.orig/drivers/char/agp/Kconfig 2006-03-24 01:59:00.000000000 +0100
+++ linux-2.6-git/drivers/char/agp/Kconfig 2006-03-24 12:59:27.000000000 +0100
@@ -1,7 +1,6 @@
config AGP
- tristate "/dev/agpgart (AGP Support)" if !GART_IOMMU
+ tristate "/dev/agpgart (AGP Support)"
depends on ALPHA || IA64 || PPC || X86
- default y if GART_IOMMU
AGP (Accelerated Graphics Port) is a bus system mainly used to
connect graphics cards to the rest of the system.
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