Re: [PATCH 3/3] x86/iommu: use __GFP_ZERO instead of memset forGART

[Ingo Molnar]

another thing:

How hard would it be to add an CONFIG_IOMMU_DEBUG option that forces as 
many DMA requests to go via the IOMMU as possible?

This slows things down of course so it's only for debugging - but it 
also makes sure that we utilize the IOMMU code to the maximum - which is 
not normally the case.

Would be nice to have it .config driven (default-disabled), so that 
-tip's randconfig testing can stumble upon it every now and then. I've 
got GART test-systems - this way we could find certain types of IOMMU 
breakages sooner.

	Ingo
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