* Davidlohr Bueso | 2016-07-20 17:16:12 [-0700]: >Just as with expunge_all and the E2BIG case, could you remove that explicit >barrier (B) and just rely on wake_q_add?
Just did. So we have just a smp_rmb() on the reader side and the comment talks about smb_wmb() and at the spot where we should have the smb_wmb we have a comment why we don't have one :) For my understanding: we need that smp_rmb() to ensure that everything past that cmpxchg() is visible on all other CPUs so we don't have the wakeup before we r_msg reads != -EAGAIN, right? >Thanks, >Davidlohr Sebastian
