On Tue, Jul 25, 2017 at 03:29:45PM +0900, Byungchul Park wrote: > _No_, as I already said. > > > (/me copy paste from older email) > > > > That gives: > > > > xhist[ 0] = A1 > > xhist[ 1] = B1 > > ... > > xhist[63] = B63 > > > > then we wrap and have: > > > > xhist[0] = B64 > > > > then we rewind to 1 and invalidate to arrive at: > > We invalidate xhist[_0_], as I already said. > > > xhist[ 0] = B64 > > xhist[ 1] = NULL <-- idx > > xhist[ 2] = B2 > > ... > > xhist[63] = B63 > > > > > > Then we do D and get > > > > xhist[ 0] = B64 > > xhist[ 1] = D <-- idx > > xhist[ 2] = B2 > > ... > > xhist[63] = B63 > > We should get > > xhist[ 0] = NULL > xhist[ 1] = D <-- idx > xhist[ 2] = B2 > ... > xhist[63] = B63 > > By the way, did not you get my reply? I did exactly same answer. > Perhaps You have not received or read my replies. > > > And now there is nothing that will invalidate B*, after all, the > > gen_id's are all after C's stamp, and the same_context_xhlock() test > > will also pass because they're all from IRQ context (albeit not the > > same, but it cannot tell). > > It will stop at xhist[0] because it has been invalidated. > > > Does this explain? Or am I still missing something? > > Could you read the following reply? Not enough? > > https://lkml.org/lkml/2017/7/13/214 > > I am sorry if my english makes you hard to understand. But I already > answered all you asked.
Ah, I think I see. It works because you commit backwards and terminate on the invalidate. Yes I had seen your emails, but the penny hadn't dropped, the light bulb didn't switch on, etc.. sometimes I'm a little dense and need a little more help. Thanks, I'll go look at your latest posting now.
