On Fri, Aug 26, 2022 at 01:10:39PM -0400, Alan Stern wrote: > > - some babbling about a missing propagation -- ISTR Linux if stuffed > > full of them, specifically we require stores to auto propagate > > without help from barriers > > Not a missing propagation; a late one. > > Don't understand what you mean by "auto propagate without help from > barriers". Linux hard relies on: CPU0 CPU1 WRITE_ONCE(foo, 1); while (!READ_ONCE(foo)); making forward progress. There were a few 'funny' uarchs that were broken, see for example commit a30718868915f.
