On Tue, Dec 20, 2022 at 02:01:30PM -0500, Mathieu Desnoyers wrote: > On 2022-12-20 13:29, Joel Fernandes wrote: > > > > > I do want to finish my memory barrier studies of SRCU over the holidays since I have been deep in the hole with that already. Back to the post flip memory barrier here since I think now even that might not be needed… > > I strongly suspect the memory barrier after flip is useless for the same > reasons I mentioned explaining why the barrier before the flip is useless. > > However, we need to double-check that we have memory barriers at the > beginning and end of synchronize_srcu, and between load of "unlock" counters > and load of "lock" counters. > > Where is the barrier at the beginning of synchronize_srcu ? rcu_seq_snap() ? > > Thanks, > > Mathieu > > -- > Mathieu Desnoyers > EfficiOS Inc. > https://www.efficios.com >
