Messages in this thread | | | Date | Mon, 10 Jun 2002 03:24:01 -0700 (PDT) | Subject | Re: PCI DMA to small buffers on cache-incoherent arch | From | "David S. Miller" <> |
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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