On Wed, Apr 14, 2021 at 10:59:23AM -0700, Alexei Starovoitov wrote: > On Wed, Apr 14, 2021 at 10:52 AM Paul E. McKenney <paulmck@xxxxxxxxxx> wrote: > > > > > > > > if (num_online_cpus() > 1) > > > > > > synchronize_rcu(); > > > > In CONFIG_PREEMPT_NONE=y and CONFIG_PREEMPT_VOLUNTARY=y kernels, this > > synchronize_rcu() will be a no-op anyway due to there only being the > > one CPU. Or are these failures all happening in CONFIG_PREEMPT=y kernels, > > and in tests where preemption could result in the observed failures? > > > > Could you please send your .config file, or at least the relevant portions > > of it? > > That's my understanding as well. I assumed Toke has preempt=y. > Otherwise the whole thing needs to be root caused properly. Given that there is only a single CPU, I am still confused about what the tests are expecting the membarrier() system call to do for them. Thanx, Paul
