> > That didn't used to work right on the AMD boards when I tried it last as
> > we ended up with a buffer that was mapped by the IOMMU for some reason
> > and that was not below 2GB.
>
> The physical address you mean? If that is still happening then it needs
> to get fixed. The allocation should not succeed if it can't provide
> memory that's inside the DMA mask for the device..
But the allocation can succeed - using GFP_DMA at least you can do it as
you get memory below 2^24 you don't need to map via the IOMMU
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