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Message-Id: <20191022191215.25781-9-paulmck@kernel.org>
Date: Tue, 22 Oct 2019 12:12:14 -0700
From: paulmck@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org,
jiangshanlai@...il.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
"Paul E. McKenney" <paulmck@...nel.org>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH tip/core/rcu 09/10] net/sched: Replace rcu_swap_protected() with rcu_replace()
From: "Paul E. McKenney" <paulmck@...nel.org>
This commit replaces the use of rcu_swap_protected() with the more
intuitively appealing rcu_replace() 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@...ux-foundation.org>
[ paulmck: From rcu_replace() to rcu_replace_pointer() per Ingo Molnar. ]
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Cong Wang <xiyou.wangcong@...il.com>
Cc: Jiri Pirko <jiri@...nulli.us>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: <netdev@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>
---
net/sched/act_api.c | 2 +-
net/sched/act_csum.c | 4 ++--
net/sched/act_ct.c | 3 ++-
net/sched/act_ctinfo.c | 4 ++--
net/sched/act_ife.c | 2 +-
net/sched/act_mirred.c | 4 ++--
net/sched/act_mpls.c | 2 +-
net/sched/act_police.c | 6 +++---
net/sched/act_sample.c | 4 ++--
net/sched/act_skbedit.c | 4 ++--
net/sched/act_tunnel_key.c | 4 ++--
net/sched/act_vlan.c | 2 +-
12 files changed, 21 insertions(+), 20 deletions(-)
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 2558f00..3d51573 100644
--- a/net/sched/act_api.c
+++ b/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);
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index d3cfad8..87dddba 100644
--- a/net/sched/act_csum.c
+++ b/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)
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index fcc4602..2d5ab23 100644
--- a/net/sched/act_ct.c
+++ b/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)
diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c
index 0dbcfd1..c599818 100644
--- a/net/sched/act_ctinfo.c
+++ b/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)
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index 3a31e24..2ea2e16 100644
--- a/net/sched/act_ife.c
+++ b/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);
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 9ce073a..0c2f737 100644
--- a/net/sched/act_mirred.c
+++ b/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;
diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
index e168df0..5b3031c 100644
--- a/net/sched/act_mpls.c
+++ b/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)
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 89c04c5..caa91cf 100644
--- a/net/sched/act_police.c
+++ b/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)
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index 514456a..4deeaf2 100644
--- a/net/sched/act_sample.c
+++ b/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;
diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index 6a8d333..c38cc39 100644
--- a/net/sched/act_skbedit.c
+++ b/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);
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 2f83a79..20d7ca4 100644
--- a/net/sched/act_tunnel_key.c
+++ b/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)
diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index 08aaf71..7aca1f0 100644
--- a/net/sched/act_vlan.c
+++ b/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)
--
2.9.5
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