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net/sched: Replace call_rcu_bh() and rcu_barrier_bh()

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Now that call_rcu()'s callback is not invoked until after bh-disable
regions of code have completed (in addition to explicitly marked
RCU read-side critical sections), call_rcu() can be used in place
of call_rcu_bh().  Similarly, rcu_barrier() can be used in place o
frcu_barrier_bh().  This commit therefore makes these changes.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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>
This commit is contained in:
Paul E. McKenney 2018-11-06 19:40:39 -08:00
parent b401ec1848
commit ae0e33494a
2 changed files with 5 additions and 5 deletions
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2
net/sched/sch_api.c
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@ -540,7 +540,7 @@ void qdisc_put_stab(struct qdisc_size_table *tab)
if (--tab->refcnt == 0) {
list_del(&tab->list);
call_rcu_bh(&tab->rcu, stab_kfree_rcu);
call_rcu(&tab->rcu, stab_kfree_rcu);
}
}
EXPORT_SYMBOL(qdisc_put_stab);

8
net/sched/sch_generic.c
View File

@ -1372,7 +1372,7 @@ void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
if (!tp_head) {
RCU_INIT_POINTER(*miniqp->p_miniq, NULL);
/* Wait for flying RCU callback before it is freed. */
rcu_barrier_bh();
rcu_barrier();
return;
}
@ -1380,10 +1380,10 @@ void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
&miniqp->miniq1 : &miniqp->miniq2;
/* We need to make sure that readers won't see the miniq
* we are about to modify. So wait until previous call_rcu_bh callback
* we are about to modify. So wait until previous call_rcu callback
* is done.
*/
rcu_barrier_bh();
rcu_barrier();
miniq->filter_list = tp_head;
rcu_assign_pointer(*miniqp->p_miniq, miniq);
@ -1392,7 +1392,7 @@ void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
* block potential new user of miniq_old until all readers
* are not seeing it.
*/
call_rcu_bh(&miniq_old->rcu, mini_qdisc_rcu_func);
call_rcu(&miniq_old->rcu, mini_qdisc_rcu_func);
}
EXPORT_SYMBOL(mini_qdisc_pair_swap);