Re: [PATCH tip/core/rcu 02/18] rcu: Move rcu_report_exp_rnp() to allow consolidation

[Peter Zijlstra]

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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