On Sat, 5 Apr 2008, Andrea Arcangeli wrote: > > + rcu_assign_pointer(mm->emm_notifier, e); > > + mm_unlock(mm); > > My mm_lock solution makes all rcu serialization an unnecessary > overhead so you should remove it like I already did in #v11. If it > wasn't the case, then mm_lock wouldn't be a definitive fix for the > race.
There still could be junk in the cache of one cpu. If you just read the new pointer but use the earlier content pointed to then you have a problem. So a memory fence / barrier is needed to guarantee that the contents pointed to are fetched after the pointer. _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
