net: sched: using kfree_rcu() to simplify the code

Wei Yongjun · davem330 · commit 6e07902f56fa · 2019-02-18T16:34:51.000-08:00
The callback function of call_rcu() just calls a kfree(), so we
can use kfree_rcu() instead of call_rcu() + callback function.

Signed-off-by: Wei Yongjun &lt;weiyongjun1@huawei.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
@@ -526,19 +526,14 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
 	return stab;
 }
 
-static void stab_kfree_rcu(struct rcu_head *head)
-{
-	kfree(container_of(head, struct qdisc_size_table, rcu));
-}
-
 void qdisc_put_stab(struct qdisc_size_table *tab)
 {
 	if (!tab)
 		return;
 
 	if (--tab->refcnt == 0) {
 		list_del(&tab->list);
-		call_rcu(&tab->rcu, stab_kfree_rcu);
+		kfree_rcu(tab, rcu);
 	}
 }
 EXPORT_SYMBOL(qdisc_put_stab);

Original file line number	Diff line number	Diff line change
`@@ -526,19 +526,14 @@ static struct qdisc_size_table qdisc_get_stab(struct nlattr opt,`
`526`	`526`	`return stab;`
`527`	`527`	`}`
`528`	`528`
`529`		`-static void stab_kfree_rcu(struct rcu_head *head)`
`530`		`-{`
`531`		`- kfree(container_of(head, struct qdisc_size_table, rcu));`
`532`		`-}`
`533`		`-`
`534`	`529`	`void qdisc_put_stab(struct qdisc_size_table *tab)`
`535`	`530`	`{`
`536`	`531`	`if (!tab)`
`537`	`532`	`return;`
`538`	`533`
`539`	`534`	`if (--tab->refcnt == 0) {`
`540`	`535`	`list_del(&tab->list);`
`541`		`- call_rcu(&tab->rcu, stab_kfree_rcu);`
	`536`	`+ kfree_rcu(tab, rcu);`
`542`	`537`	`}`
`543`	`538`	`}`
`544`	`539`	`EXPORT_SYMBOL(qdisc_put_stab);`