net: don't use INIT_RCU_HEAD

call_rcu() will unconditionally rewrite RCU head anyway.
Applies to 
	struct neigh_parms
	struct neigh_table
	struct net
	struct cipso_v4_doi
	struct in_ifaddr
	struct in_device
	rt->u.dst

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 1 insertions, 14 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 1dc728b38589..b337a937ea52 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1340,7 +1340,6 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
         if (p) {
                 p->tbl            = tbl;
                 atomic_set(&p->refcnt, 1);
-                INIT_RCU_HEAD(&p->rcu_head);
                 p->reachable_time =
                                 neigh_rand_reach_time(p->base_reachable_time);
 
@@ -1412,7 +1411,6 @@ void neigh_table_init_no_netlink(struct neigh_table *tbl)
         tbl->parms.net = &init_net;
 #endif
         atomic_set(&tbl->parms.refcnt, 1);
-        INIT_RCU_HEAD(&tbl->parms.rcu_head);
         tbl->parms.reachable_time =
                           neigh_rand_reach_time(tbl->parms.base_reachable_time);
 
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index f1d07b5c1e17..861b4cbf40db 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -47,7 +47,6 @@ static __net_init int setup_net(struct net *net)
                 goto out;
 
         ng->len = INITIAL_NET_GEN_PTRS;
-        INIT_RCU_HEAD(&ng->rcu);
         rcu_assign_pointer(net->gen, ng);
 
         error = 0;
@@ -446,7 +445,6 @@ int net_assign_generic(struct net *net, int id, void *data)
          */
 
         ng->len = id;
-        INIT_RCU_HEAD(&ng->rcu);
         memcpy(&ng->ptr, &old_ng->ptr, old_ng->len);
 
         rcu_assign_pointer(net->gen, ng);
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 490e035c6d90..4bcec7f77251 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -490,7 +490,6 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
         }
 
         atomic_set(&doi_def->refcount, 1);
-        INIT_RCU_HEAD(&doi_def->rcu);
 
         spin_lock(&cipso_v4_doi_list_lock);
         if (cipso_v4_doi_search(doi_def->doi) != NULL)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 56fce3ab6c55..0bff576d2918 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -112,13 +112,7 @@ static inline void devinet_sysctl_unregister(struct in_device *idev)
 
 static struct in_ifaddr *inet_alloc_ifa(void)
 {
-        struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
-
-        if (ifa) {
-                INIT_RCU_HEAD(&ifa->rcu_head);
-        }
-
-        return ifa;
+        return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
 }
 
 static void inet_rcu_free_ifa(struct rcu_head *head)
@@ -161,7 +155,6 @@ static struct in_device *inetdev_init(struct net_device *dev)
         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
         if (!in_dev)
                 goto out;
-        INIT_RCU_HEAD(&in_dev->rcu_head);
         memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
                         sizeof(in_dev->cnf));
         in_dev->cnf.sysctl = NULL;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ffb2c5705432..e59b4dcf6778 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1386,7 +1386,6 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
 
                                 /* Copy all the information. */
                                 *rt = *rth;
-                                INIT_RCU_HEAD(&rt->u.dst.rcu_head);
                                 rt->u.dst.__use         = 1;
                                 atomic_set(&rt->u.dst.__refcnt, 1);
                                 rt->u.dst.child         = NULL;