On Wednesday 25 April 2007 03:12:51 H. Peter Anvin wrote:

> You can probably find almost any possible bitmask if you look long 
> enough.  Hardware vendors are notorious for this kind of "optimizations".

The nice thing is if this was solved in the IOMMU code then we could drop
(or not initialize) GFP_DMA on systems with that hardware. I guess GFP_DMA32 
would still need to stay for the graphics devices though.

Not sure how much difference it would make though, but at least Christoph 
Lameter
seems to think it would.

-Andi
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