[PATCH tip/core/rcu 31/41] net/sched: Replace call_rcu_bh() and rcu_barrier_bh()

Paul E. McKenney
2018-11-11T19:46:53Z

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>
---
net/sched/sch_api.c | 2 +-
net/sched/sch_generic.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index ca3b0f46de53..016e628c6ac9 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -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);
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index de1663f7d3ad..66ba2ce2320f 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -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);

--
2.17.1