net/sched: Replace rcu_swap_protected() with rcu_replace_pointer()

This commit replaces the use of rcu_swap_protected() with the more
intuitively appealing rcu_replace_pointer() as a step towards removing
rcu_swap_protected().

Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@mail.gmail.com/
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
[ paulmck: From rcu_replace() to rcu_replace_pointer() per Ingo Molnar. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>

net/sched/act_api.c

@@ -88,7 +88,7 @@ struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
 					 struct tcf_chain *goto_chain)
 {
 	a->tcfa_action = action;
-	rcu_swap_protected(a->goto_chain, goto_chain, 1);
+	goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
 	return goto_chain;
 }
 EXPORT_SYMBOL(tcf_action_set_ctrlact);

net/sched/act_csum.c

@@ -101,8 +101,8 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&p->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(p->params, params_new,
-			   lockdep_is_held(&p->tcf_lock));
+	params_new = rcu_replace_pointer(p->params, params_new,
+					 lockdep_is_held(&p->tcf_lock));
 	spin_unlock_bh(&p->tcf_lock);
 
 	if (goto_ch)

net/sched/act_ct.c

@@ -722,7 +722,8 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&c->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(c->params, params, lockdep_is_held(&c->tcf_lock));
+	params = rcu_replace_pointer(c->params, params,
+				     lockdep_is_held(&c->tcf_lock));
 	spin_unlock_bh(&c->tcf_lock);
 
 	if (goto_ch)

net/sched/act_ctinfo.c

@@ -257,8 +257,8 @@ static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&ci->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, actparm->action, goto_ch);
-	rcu_swap_protected(ci->params, cp_new,
-			   lockdep_is_held(&ci->tcf_lock));
+	cp_new = rcu_replace_pointer(ci->params, cp_new,
+				     lockdep_is_held(&ci->tcf_lock));
 	spin_unlock_bh(&ci->tcf_lock);
 
 	if (goto_ch)

net/sched/act_ife.c

@@ -594,7 +594,7 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 		spin_lock_bh(&ife->tcf_lock);
 	/* protected by tcf_lock when modifying existing action */
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(ife->params, p, 1);
+	p = rcu_replace_pointer(ife->params, p, 1);
 
 	if (exists)
 		spin_unlock_bh(&ife->tcf_lock);

net/sched/act_mirred.c

@@ -178,8 +178,8 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 			goto put_chain;
 		}
 		mac_header_xmit = dev_is_mac_header_xmit(dev);
-		rcu_swap_protected(m->tcfm_dev, dev,
-				   lockdep_is_held(&m->tcf_lock));
+		dev = rcu_replace_pointer(m->tcfm_dev, dev,
+					  lockdep_is_held(&m->tcf_lock));
 		if (dev)
 			dev_put(dev);
 		m->tcfm_mac_header_xmit = mac_header_xmit;

net/sched/act_mpls.c

@@ -258,7 +258,7 @@ static int tcf_mpls_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&m->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
+	p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
 	spin_unlock_bh(&m->tcf_lock);
 
 	if (goto_ch)

net/sched/act_police.c

@@ -191,9 +191,9 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
 		police->tcfp_ptoks = new->tcfp_mtu_ptoks;
 	spin_unlock_bh(&police->tcfp_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(police->params,
-			   new,
-			   lockdep_is_held(&police->tcf_lock));
+	new = rcu_replace_pointer(police->params,
+				  new,
+				  lockdep_is_held(&police->tcf_lock));
 	spin_unlock_bh(&police->tcf_lock);
 
 	if (goto_ch)

net/sched/act_sample.c

@@ -102,8 +102,8 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 	s->rate = rate;
 	s->psample_group_num = psample_group_num;
-	rcu_swap_protected(s->psample_group, psample_group,
-			   lockdep_is_held(&s->tcf_lock));
+	psample_group = rcu_replace_pointer(s->psample_group, psample_group,
+					    lockdep_is_held(&s->tcf_lock));
 
 	if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
 		s->truncate = true;

net/sched/act_skbedit.c

@@ -206,8 +206,8 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&d->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(d->params, params_new,
-			   lockdep_is_held(&d->tcf_lock));
+	params_new = rcu_replace_pointer(d->params, params_new,
+					 lockdep_is_held(&d->tcf_lock));
 	spin_unlock_bh(&d->tcf_lock);
 	if (params_new)
 		kfree_rcu(params_new, rcu);

net/sched/act_tunnel_key.c

@@ -381,8 +381,8 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&t->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(t->params, params_new,
-			   lockdep_is_held(&t->tcf_lock));
+	params_new = rcu_replace_pointer(t->params, params_new,
+					 lockdep_is_held(&t->tcf_lock));
 	spin_unlock_bh(&t->tcf_lock);
 	tunnel_key_release_params(params_new);
 	if (goto_ch)

net/sched/act_vlan.c

@@ -220,7 +220,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
 
 	spin_lock_bh(&v->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
-	rcu_swap_protected(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
+	p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
 	spin_unlock_bh(&v->tcf_lock);
 
 	if (goto_ch)