Workaround for USB DMA bugs

[Jeremy Rosen]

>I guess if we can ensure a DMA-only pool, simple alignment will work.
>You just can't kmalloc() because you don't know what may follow
something
>that isn't modulo cache line size.  You also have to be careful of
code
>that allocates a large object, then uses part of it for DMA and other
>parts for processor core data.  I'm not sure we want to require
kmalloc()
>to always cache align due to the potential for wasted memory space.

can't we use the __GFP_DMA flag to specify that the area must have
algnment enforced ?
or did I misunderstand the use of this flag ?

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