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SubjectRe: PCI DMA to small buffers on cache-incoherent arch
On Mon, Jun 10, 2002 at 12:03:19PM -0700, Roland Dreier wrote:
> >>>>> "Tom" == Tom Rini <> writes:
> Tom> No. We should just make it come out to a nop for arches that
> Tom> don't need it. Otherwise we'll end up with ugly things like:
> Tom> #ifdef CONFIG_NOT_CACHE_COHERENT ... #else ... #endif
> Tom> All over things like USB...
> Good point. How about the following: add a file to each arch named
> say, <asm/dma_buffer.h>, that defines a macro __dma_buffer. This
> macro would be used as follows to mark DMA buffers (example taken from
> <linux/usb.h>):
> Comments?

SMP_CACHE_BYTES is non-sensical on 4xx (and 8xx) since they don't do

Tom Rini (TR1265)
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