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

David S. Miller
2002-06-10T10:28:01Z

From: Oliver Neukum <oliver@neukum.name>
Date: Mon, 10 Jun 2002 12:00:14 +0200

> You flush either before/after depending upon whether the cpu caches
> are writeback in nature or not, and the cpu is not allowed to touch
> those addresses while the device is doing the DMA.

So we need some kind of cache_aligned macro in our USB data
structures if they contain a buffer. Which macro would we have to use ?

For now use SMP_CACHE_BYTES I guess.