On 1/20/21 6:43 AM, Jarkko Sakkinen wrote: >> So why do you need the synchronize_srcu() call when this process sees an >> empty mm_list already? >> >> Thx. > The other process aka some process using the enclave calls list_del_rcu() > (and synchronize_srcu()), which starts a new grace period. If we don't > do it, then the cleanup_srcu() will race with that grace period. To me, this is only a partial explanation. That goal of synchronize_srcu() is to wait for the completion of a *previous* grace period: one that might have observed the old state of the list. Could you explain the *actual* effects of the misplaced synchronize_srcu()? If the race _occurs_, what is the side-effect?
