RE: [Xen-merge] AMD64 dma-mapping

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

> > If I turn on CONFIG_GART_IOMMU in the Kconfig,
> > enable it in the .config file, and build the
> > kernel, I get errors because
> > include/asm-i386/mach-xen/asm/dma-mapping.h
> > is included instead of 
> > include/asm-x86_64/mach-xen/asm/dma-mapping.h
> > 
> > I can't figure out how or where the build system
> > decides which dma-mapping file to include.  Help
> > would be appreciated.
> 
> The build always uses include/asm, which should be symlink'd 
> to the right architecture's asm-$(ARCH) directory. Are you 
> sure you're building for x86-64? is gart the only thing 
> that's pulling in the wrong dma-mapping.h?

include/asm is correctly linked to include/asm-x86_64

poking around a bit, I found that asm/dma-mapping is
being included from include/linux/dma-mapping.h
If I force the include there to be asm-x86_64/dma-mapping.h,
the code compiles.  That's not an acceptable long-term
solution, obviously.

There are some files in arch/x86_64/kernel that are 
being compiled from arch/i386/kernel (such as swiotlb.c),
but the mainline tree does that too without this problem.

-Mark Langsdorf
AMD, Inc.


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