Commit 96e92021 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Make use of rcu_preempt_has_tasks() 



Given that there is now arcu_preempt_has_tasks() function that checks
to see if the ->blkd_tasks list is non-empty, this commit makes use of it.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent a8f4cbad

kernel/rcu/tree_plugin.h

+3 −3
Original line number Diff line number Diff line
@@ -540,7 +540,7 @@ static int rcu_print_task_stall(struct rcu_node *rnp) 
static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)

{

	WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp));

	if (!list_empty(&rnp->blkd_tasks))

	if (rcu_preempt_has_tasks(rnp))

		rnp->gp_tasks = rnp->blkd_tasks.next;

	WARN_ON_ONCE(rnp->qsmask);

}
@@ -706,7 +706,7 @@ sync_rcu_preempt_exp_init(struct rcu_state *rsp, struct rcu_node *rnp) 


	raw_spin_lock_irqsave(&rnp->lock, flags);

	smp_mb__after_unlock_lock();

	if (list_empty(&rnp->blkd_tasks)) {

	if (!rcu_preempt_has_tasks(rnp)) {

		raw_spin_unlock_irqrestore(&rnp->lock, flags);

	} else {

		rnp->exp_tasks = rnp->blkd_tasks.next;
@@ -985,7 +985,7 @@ void exit_rcu(void) 


static void rcu_initiate_boost_trace(struct rcu_node *rnp)

{

	if (list_empty(&rnp->blkd_tasks))

	if (!rcu_preempt_has_tasks(rnp))

		rnp->n_balk_blkd_tasks++;

	else if (rnp->exp_tasks == NULL && rnp->gp_tasks == NULL)

		rnp->n_balk_exp_gp_tasks++;