Workaround for USB DMA bugs

[David Gibson]

On Thu, Apr 04, 2002 at 01:16:46AM -0500, Dan Malek wrote:
>
> Jeremy Rosen wrote:
>
>
> >can't we use the __GFP_DMA flag to specify that the area must have
> >algnment enforced ?
>
> Maybe, but that isn't its intended use.
>
> >or did I misunderstand the use of this flag ?
>
> This flag is used on architectures that have memory only accessible
> from the processor, not from a DMA device, to ensure a DMA device
> gets a memory bank that it can access.

More specifically it's used on x86 for old ISA devices.

--
David Gibson			| For every complex problem there is a
david at gibson.dropbear.id.au	| solution which is simple, neat and
				| wrong.  -- H.L. Mencken
http://www.ozlabs.org/people/dgibson


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