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> > if (pwq->plugged) { > > pwq->plugged = false; > > - if (pwq_activate_first_inactive(pwq, true)) > > + if (pwq_activate_first_inactive(pwq, true)) { > > + if (!list_empty(&pwq->inactive_works)) { > > + struct worker_pool *pool = pwq->pool; > > + struct wq_node_nr_active *nna = > > + wq_node_nr_active(wq, pool->node); > > + > > + raw_spin_lock(&nna->lock); > > + if (list_empty(&pwq->pending_node)) > > + list_add_tail(&pwq->pending_node, > > + &nna->pending_pwqs); > > + raw_spin_unlock(&nna->lock); > > + } > > It's a bit gnarly to open code locking and list operation. Would just > calling pwq_activate_first_inactive(pwq, false) one more time work here? > That'd trigger tryinc_node_nr_active() failure in pwq_tryinc_nr_active() and > the addition to the pending list. As this is quite subtle, it'd be nice to > have some comment - it's compensating for the missed pwq_tryinc_nr_active() > call due to plugging, right? Yeah, I think that will work. Let me verify with my reproducer and adjust the patch accordingly. +1 on the comment as well—very subtle. Took a few days of reverse-engineering work queues to track down. Matt > > Thanks. > > -- > tejun