On Wed, 03 Mar 2010 16:10:32 +1100 Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 2010-03-03 at 12:47 +0900, FUJITA Tomonori wrote: > > The ways to improve the approach (introducing PG_arch_2 or marking a > > page clean on dma_unmap_* with DMA_FROM_DEVICE like ia64 does) is up > > to architectures. > > How does the above work ? IE, the dma unmap will flush the D side but > not the I side ... or is the ia64 flush primitive magic enough to do > both ? On ia64 platform, I (and D) cache is coherent with the memory that you did DMA to, I think. But better to ask an ia64 guru. :) -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
