From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: [PATCH tip/core/rcu 31/41] net/sched: Replace call_rcu_bh() and rcu_barrier_bh() Date: Sun, 11 Nov 2018 11:44:00 -0800 Message-ID: <20181111194410.6368-31-paulmck@linux.ibm.com> References: <20181111194104.GA4787@linux.ibm.com> Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" , Jamal Hadi Salim , Cong Wang , Jiri Pirko , "David S. Miller" , netdev@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:50468 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727173AbeKLFds (ORCPT ); Mon, 12 Nov 2018 00:33:48 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wABJiEP9048116 for ; Sun, 11 Nov 2018 14:44:21 -0500 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0b-001b2d01.pphosted.com with ESMTP id 2npdvs8pjr-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sun, 11 Nov 2018 14:44:21 -0500 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 11 Nov 2018 19:44:20 -0000 In-Reply-To: <20181111194104.GA4787@linux.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 Cc: Jamal Hadi Salim Cc: Cong Wang Cc: Jiri Pirko Cc: "David S. Miller" Cc: --- 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