Re: PCI DMA to small buffers on cache-incoherent arch

[Tom Rini]

On Mon, Jun 10, 2002 at 12:03:19PM -0700, Roland Dreier wrote:
> >>>>> "Tom" == Tom Rini <[e-mail]> 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>):
[snip]
> Comments?

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

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/