On Mon, Apr 27, 2009 at 4:09 AM, Liu Dave-R63238 <dave...@freescale.com> wrote:
> You are assuming the PCI memory space is prefetchable( no side effect) > for DMA. > Is it possible that DMA is from non-prefetchable memory space? This should be a safe assumption for this driver. Remember, this driver just does offload memcpy, from one region to another. So the PCI memory that you are reading from should be just a buffer of data, and there should be side-effect of reading it. However, I would like to see a comment at the top of the file warning people that copying from PCI memory will result in prefetched reads. -- Timur Tabi Linux kernel developer at Freescale _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
