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

[David S. Miller]

   From: Oliver Neukum <[e-mail]>
   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.