Hi Alan, Thanks for your comment. On Tue, Aug 30, 2011 at 12:33 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > Nevertheless, it remains true that you want to add a memory barrier > instruction simply in order to speed up a cache writeback, not to force > any sort of ordering. This needs to be explained carefully in the code > (not just in the patch description!) and it needs to be done in a way > that won't affect other architectures. OK, will do it. > Also, as you mentioned before, you may want to do the same thing in > qh_link_async() just after the > > head->hw->hw_next = dma; > > line. Delays in flushing that write would also slow down performance. Will do it too. thanks, -- Ming Lei -- 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
