On Wed, Oct 07, 2015 at 01:50:46PM +0200, Peter Zijlstra wrote:
> @@ -1512,10 +1554,8 @@ rcu_start_future_gp(struct rcu_node *rnp, struct
> rcu_data *rdp,
> * hold it, acquire the root rcu_node structure's lock in order to
> * start one (if needed).
> */
> - if (rnp != rnp_root) {
> - raw_spin_lock(&rnp_root->lock);
> - smp_mb__after_unlock_lock();
> - }
> + if (rnp != rnp_root)
> + raw_spin_lock_rcu_node(rnp);
rnp_root
> @@ -2312,8 +2343,7 @@ static void rcu_report_unblock_qs_rnp(struct rcu_state
> *rsp,
> gps = rnp->gpnum;
> mask = rnp->grpmask;
> raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
> - raw_spin_lock(&rnp_p->lock); /* irqs already disabled. */
> - smp_mb__after_unlock_lock();
> + raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */
rnp_p
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