diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 30612497643c08caa8a3bf352b13f784f729f725..b97a907ea5aac52e4ffe410d63cd573cce978ed3 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -230,4 +230,5 @@ static __net_init int loopback_net_init(struct net *net)
 /* Registered in net/core/dev.c */
 struct pernet_operations __net_initdata loopback_net_ops = {
 	.init = loopback_net_init,
+	.async = true,
 };
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 68c06ae7888c8cb5d07053863698b7a478d68d4e..da6f8733c9c5b66636246d4beec04906f804ac86 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -237,6 +237,7 @@ static __net_exit void proc_net_ns_exit(struct net *net)
 static struct pernet_operations __net_initdata proc_net_ns_ops = {
 	.init = proc_net_ns_init,
 	.exit = proc_net_ns_exit,
+	.async = true,
 };
 
 int __init proc_net_init(void)
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 1fdcde96eb656a9e5cc87c9f17c2589942c9f16c..e9ee9ad0a68195304ec7d12e21011de089077721 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -36,6 +36,7 @@ extern int rtnl_is_locked(void);
 
 extern wait_queue_head_t netdev_unregistering_wq;
 extern struct mutex net_mutex;
+extern struct rw_semaphore net_sem;
 
 #ifdef CONFIG_PROVE_LOCKING
 extern bool lockdep_rtnl_is_held(void);
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index f306b2aa15a411f979ee58db1885cb62b6dcd48e..9158ec1ad06f493151502f57c69c42881d8c7272 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -313,6 +313,12 @@ struct pernet_operations {
 	void (*exit_batch)(struct list_head *net_exit_list);
 	unsigned int *id;
 	size_t size;
+	/*
+	 * Indicates above methods are allowed to be executed in parallel
+	 * with methods of any other pernet_operations, i.e. they are not
+	 * need synchronization via net_mutex.
+	 */
+	bool async;
 };
 
 /*
diff --git a/kernel/audit.c b/kernel/audit.c
index 227db99b0f19a8f4797c424fa2957741bccf1ce5..5e49b614d0e67d2614e6ba46b7eb6148a777b7d5 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1526,6 +1526,7 @@ static struct pernet_operations audit_net_ops __net_initdata = {
 	.exit = audit_net_exit,
 	.id = &audit_net_id,
 	.size = sizeof(struct audit_net),
+	.async = true,
 };
 
 /* Initialize audit support at boot time. */
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 9fe6ec8fda28ea732d41cad83fd639a82a41a69c..9539d7ab3ea85e86d3f5d4bc13f5191a37dc0c4e 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -650,6 +650,7 @@ static void uevent_net_exit(struct net *net)
 static struct pernet_operations uevent_net_ops = {
 	.init	= uevent_net_init,
 	.exit	= uevent_net_exit,
+	.async  = true,
 };
 
 static int __init kobject_uevent_init(void)
diff --git a/net/core/dev.c b/net/core/dev.c
index dda9d7b9a840702d13b518507fef7a3723fce017..df5241c8eda1ad1be45a09b5649347f67a7f2763 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -8833,6 +8833,7 @@ static void __net_exit netdev_exit(struct net *net)
 static struct pernet_operations __net_initdata netdev_net_ops = {
 	.init = netdev_init,
 	.exit = netdev_exit,
+	.async = true,
 };
 
 static void __net_exit default_device_exit(struct net *net)
@@ -8933,6 +8934,7 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list)
 static struct pernet_operations __net_initdata default_device_ops = {
 	.exit = default_device_exit,
 	.exit_batch = default_device_exit_batch,
+	.async = true,
 };
 
 /*
diff --git a/net/core/fib_notifier.c b/net/core/fib_notifier.c
index 0c048bdeb0160f1d7f5865e59390f3824c8a1fe8..5ace0705a3f918783eedd080651a5c29312006ed 100644
--- a/net/core/fib_notifier.c
+++ b/net/core/fib_notifier.c
@@ -171,6 +171,7 @@ static void __net_exit fib_notifier_net_exit(struct net *net)
 static struct pernet_operations fib_notifier_net_ops = {
 	.init = fib_notifier_net_init,
 	.exit = fib_notifier_net_exit,
+	.async = true,
 };
 
 static int __init fib_notifier_init(void)
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 98e1066c3d551df066fd7681f197718f75afb251..cb071b8e8d17bbfe7b68132462b937629cc2115b 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -1030,6 +1030,7 @@ static void __net_exit fib_rules_net_exit(struct net *net)
 static struct pernet_operations fib_rules_net_ops = {
 	.init = fib_rules_net_init,
 	.exit = fib_rules_net_exit,
+	.async = true,
 };
 
 static int __init fib_rules_init(void)
diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index e010bb800d7b8964af738d5ccf516bca2018803f..65b51e7787827d07975e6374dd156ea3ab6d3dce 100644
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -349,6 +349,7 @@ static void __net_exit dev_proc_net_exit(struct net *net)
 static struct pernet_operations __net_initdata dev_proc_ops = {
 	.init = dev_proc_net_init,
 	.exit = dev_proc_net_exit,
+	.async = true,
 };
 
 static int dev_mc_seq_show(struct seq_file *seq, void *v)
@@ -405,6 +406,7 @@ static void __net_exit dev_mc_net_exit(struct net *net)
 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 	.init = dev_mc_net_init,
 	.exit = dev_mc_net_exit,
+	.async = true,
 };
 
 int __init dev_proc_init(void)
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 3cad5f51afd3c87ecb5420e8ee5c57741ae644ac..bcab9a938d6f3e229e3a9044c30ad9d9980dd446 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -29,6 +29,7 @@
 
 static LIST_HEAD(pernet_list);
 static struct list_head *first_device = &pernet_list;
+/* Used only if there are !async pernet_operations registered */
 DEFINE_MUTEX(net_mutex);
 
 LIST_HEAD(net_namespace_list);
@@ -41,6 +42,12 @@ struct net init_net = {
 EXPORT_SYMBOL(init_net);
 
 static bool init_net_initialized;
+static unsigned nr_sync_pernet_ops;
+/*
+ * net_sem: protects: pernet_list, net_generic_ids, nr_sync_pernet_ops,
+ * init_net_initialized and first_device pointer.
+ */
+DECLARE_RWSEM(net_sem);
 
 #define MIN_PERNET_OPS_ID	\
 	((sizeof(struct net_generic) + sizeof(void *) - 1) / sizeof(void *))
@@ -65,11 +72,10 @@ static int net_assign_generic(struct net *net, unsigned int id, void *data)
 {
 	struct net_generic *ng, *old_ng;
 
-	BUG_ON(!mutex_is_locked(&net_mutex));
 	BUG_ON(id < MIN_PERNET_OPS_ID);
 
 	old_ng = rcu_dereference_protected(net->gen,
-					   lockdep_is_held(&net_mutex));
+					   lockdep_is_held(&net_sem));
 	if (old_ng->s.len > id) {
 		old_ng->ptr[id] = data;
 		return 0;
@@ -286,7 +292,7 @@ struct net *get_net_ns_by_id(struct net *net, int id)
  */
 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
 {
-	/* Must be called with net_mutex held */
+	/* Must be called with net_sem held */
 	const struct pernet_operations *ops, *saved_ops;
 	int error = 0;
 	LIST_HEAD(net_exit_list);
@@ -303,6 +309,9 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
 		if (error < 0)
 			goto out_undo;
 	}
+	rtnl_lock();
+	list_add_tail_rcu(&net->list, &net_namespace_list);
+	rtnl_unlock();
 out:
 	return error;
 
@@ -331,6 +340,7 @@ static int __net_init net_defaults_init_net(struct net *net)
 
 static struct pernet_operations net_defaults_ops = {
 	.init = net_defaults_init_net,
+	.async = true,
 };
 
 static __init int net_defaults_init(void)
@@ -408,32 +418,32 @@ struct net *copy_net_ns(unsigned long flags,
 
 	net = net_alloc();
 	if (!net) {
-		dec_net_namespaces(ucounts);
-		return ERR_PTR(-ENOMEM);
+		rv = -ENOMEM;
+		goto dec_ucounts;
 	}
-
+	refcount_set(&net->passive, 1);
+	net->ucounts = ucounts;
 	get_user_ns(user_ns);
 
-	rv = mutex_lock_killable(&net_mutex);
-	if (rv < 0) {
-		net_free(net);
-		dec_net_namespaces(ucounts);
-		put_user_ns(user_ns);
-		return ERR_PTR(rv);
+	rv = down_read_killable(&net_sem);
+	if (rv < 0)
+		goto put_userns;
+	if (nr_sync_pernet_ops) {
+		rv = mutex_lock_killable(&net_mutex);
+		if (rv < 0)
+			goto up_read;
 	}
-
-	net->ucounts = ucounts;
 	rv = setup_net(net, user_ns);
-	if (rv == 0) {
-		rtnl_lock();
-		list_add_tail_rcu(&net->list, &net_namespace_list);
-		rtnl_unlock();
-	}
-	mutex_unlock(&net_mutex);
+	if (nr_sync_pernet_ops)
+		mutex_unlock(&net_mutex);
+up_read:
+	up_read(&net_sem);
 	if (rv < 0) {
-		dec_net_namespaces(ucounts);
+put_userns:
 		put_user_ns(user_ns);
 		net_drop_ns(net);
+dec_ucounts:
+		dec_net_namespaces(ucounts);
 		return ERR_PTR(rv);
 	}
 	return net;
@@ -481,7 +491,9 @@ static void cleanup_net(struct work_struct *work)
 	list_replace_init(&cleanup_list, &net_kill_list);
 	spin_unlock_irq(&cleanup_list_lock);
 
-	mutex_lock(&net_mutex);
+	down_read(&net_sem);
+	if (nr_sync_pernet_ops)
+		mutex_lock(&net_mutex);
 
 	/* Don't let anyone else find us. */
 	rtnl_lock();
@@ -516,11 +528,14 @@ static void cleanup_net(struct work_struct *work)
 	list_for_each_entry_reverse(ops, &pernet_list, list)
 		ops_exit_list(ops, &net_exit_list);
 
+	if (nr_sync_pernet_ops)
+		mutex_unlock(&net_mutex);
+
 	/* Free the net generic variables */
 	list_for_each_entry_reverse(ops, &pernet_list, list)
 		ops_free_list(ops, &net_exit_list);
 
-	mutex_unlock(&net_mutex);
+	up_read(&net_sem);
 
 	/* Ensure there are no outstanding rcu callbacks using this
 	 * network namespace.
@@ -547,8 +562,10 @@ static void cleanup_net(struct work_struct *work)
  */
 void net_ns_barrier(void)
 {
+	down_write(&net_sem);
 	mutex_lock(&net_mutex);
 	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 }
 EXPORT_SYMBOL(net_ns_barrier);
 
@@ -633,6 +650,7 @@ static __net_exit void net_ns_net_exit(struct net *net)
 static struct pernet_operations __net_initdata net_ns_ops = {
 	.init = net_ns_net_init,
 	.exit = net_ns_net_exit,
+	.async = true,
 };
 
 static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {
@@ -875,17 +893,12 @@ static int __init net_ns_init(void)
 
 	rcu_assign_pointer(init_net.gen, ng);
 
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	if (setup_net(&init_net, &init_user_ns))
 		panic("Could not setup the initial network namespace");
 
 	init_net_initialized = true;
-
-	rtnl_lock();
-	list_add_tail_rcu(&init_net.list, &net_namespace_list);
-	rtnl_unlock();
-
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 
 	register_pernet_subsys(&net_ns_ops);
 
@@ -989,6 +1002,9 @@ static int register_pernet_operations(struct list_head *list,
 		rcu_barrier();
 		if (ops->id)
 			ida_remove(&net_generic_ids, *ops->id);
+	} else if (!ops->async) {
+		pr_info_once("Pernet operations %ps are sync.\n", ops);
+		nr_sync_pernet_ops++;
 	}
 
 	return error;
@@ -996,7 +1012,8 @@ static int register_pernet_operations(struct list_head *list,
 
 static void unregister_pernet_operations(struct pernet_operations *ops)
 {
-	
+	if (!ops->async)
+		BUG_ON(nr_sync_pernet_ops-- == 0);
 	__unregister_pernet_operations(ops);
 	rcu_barrier();
 	if (ops->id)
@@ -1025,9 +1042,9 @@ static void unregister_pernet_operations(struct pernet_operations *ops)
 int register_pernet_subsys(struct pernet_operations *ops)
 {
 	int error;
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	error =  register_pernet_operations(first_device, ops);
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 	return error;
 }
 EXPORT_SYMBOL_GPL(register_pernet_subsys);
@@ -1043,9 +1060,9 @@ EXPORT_SYMBOL_GPL(register_pernet_subsys);
  */
 void unregister_pernet_subsys(struct pernet_operations *ops)
 {
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	unregister_pernet_operations(ops);
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 }
 EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
 
@@ -1071,11 +1088,11 @@ EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
 int register_pernet_device(struct pernet_operations *ops)
 {
 	int error;
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	error = register_pernet_operations(&pernet_list, ops);
 	if (!error && (first_device == &pernet_list))
 		first_device = &ops->list;
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 	return error;
 }
 EXPORT_SYMBOL_GPL(register_pernet_device);
@@ -1091,11 +1108,11 @@ EXPORT_SYMBOL_GPL(register_pernet_device);
  */
 void unregister_pernet_device(struct pernet_operations *ops)
 {
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	if (&ops->list == first_device)
 		first_device = first_device->next;
 	unregister_pernet_operations(ops);
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 }
 EXPORT_SYMBOL_GPL(unregister_pernet_device);
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index bc290413a49d5e3c7e115c5d900e087882735397..67f375cfb9829806bb8beb86f15acfa3e76b8c4d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -454,11 +454,11 @@ static void rtnl_lock_unregistering_all(void)
 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 {
 	/* Close the race with cleanup_net() */
-	mutex_lock(&net_mutex);
+	down_write(&net_sem);
 	rtnl_lock_unregistering_all();
 	__rtnl_link_unregister(ops);
 	rtnl_unlock();
-	mutex_unlock(&net_mutex);
+	up_write(&net_sem);
 }
 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 
@@ -4724,6 +4724,7 @@ static void __net_exit rtnetlink_net_exit(struct net *net)
 static struct pernet_operations rtnetlink_net_ops = {
 	.init = rtnetlink_net_init,
 	.exit = rtnetlink_net_exit,
+	.async = true,
 };
 
 void __init rtnetlink_init(void)
diff --git a/net/core/sock.c b/net/core/sock.c
index 04e5e27c9b81d6a0c46c868cbdd58106a11085e4..e90d461748f0fe8a0e15c02f59231d4d6d7a171c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3112,6 +3112,7 @@ static void __net_exit sock_inuse_exit_net(struct net *net)
 static struct pernet_operations net_inuse_ops = {
 	.init = sock_inuse_init_net,
 	.exit = sock_inuse_exit_net,
+	.async = true,
 };
 
 static __init int net_inuse_init(void)
@@ -3385,6 +3386,7 @@ static __net_exit void proto_exit_net(struct net *net)
 static __net_initdata struct pernet_operations proto_net_ops = {
 	.init = proto_init_net,
 	.exit = proto_exit_net,
+	.async = true,
 };
 
 static int __init proto_init(void)
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index 146b50e30659daca3bdc4413d800890ef482f521..aee5642affd93bba82e06570a5c6de7e0b9116f6 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -328,6 +328,7 @@ static void __net_exit diag_net_exit(struct net *net)
 static struct pernet_operations diag_net_ops = {
 	.init = diag_net_init,
 	.exit = diag_net_exit,
+	.async = true,
 };
 
 static int __init sock_diag_init(void)
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index f2d0462611c35b16aaca6d060e78e5e5af9aa2a4..d714f65782b7c3dc6d944ca572882b59b24f96f8 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -572,6 +572,7 @@ static __net_exit void sysctl_core_net_exit(struct net *net)
 static __net_initdata struct pernet_operations sysctl_core_ops = {
 	.init = sysctl_core_net_init,
 	.exit = sysctl_core_net_exit,
+	.async = true,
 };
 
 static __init int sysctl_core_init(void)
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index f98e2f0db841b1ff9c75ab7cab2f7e95c0e20654..e8c7fad8c3290452ffa948da2a268f2e5d1b92f3 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1735,6 +1735,7 @@ static __net_exit void ipv4_mib_exit_net(struct net *net)
 static __net_initdata struct pernet_operations ipv4_mib_ops = {
 	.init = ipv4_mib_init_net,
 	.exit = ipv4_mib_exit_net,
+	.async = true,
 };
 
 static int __init init_ipv4_mibs(void)
@@ -1788,6 +1789,7 @@ static __net_exit void inet_exit_net(struct net *net)
 static __net_initdata struct pernet_operations af_inet_ops = {
 	.init = inet_init_net,
 	.exit = inet_exit_net,
+	.async = true,
 };
 
 static int __init init_inet_pernet_ops(void)
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index f28f06c91eadc03446830357ae9bac332b8f60c9..7dc9de8444a909f8343b45efcc39082a2537ee98 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1447,6 +1447,7 @@ static void __net_exit arp_net_exit(struct net *net)
 static struct pernet_operations arp_net_ops = {
 	.init = arp_net_init,
 	.exit = arp_net_exit,
+	.async = true,
 };
 
 static int __init arp_proc_init(void)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 40f001782c1b37314ecd197ab65cb3adc68f50c7..5ae0d1f097ca591c208af33e63d1fe1975ba0ab5 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2469,6 +2469,7 @@ static __net_exit void devinet_exit_net(struct net *net)
 static __net_initdata struct pernet_operations devinet_ops = {
 	.init = devinet_init_net,
 	.exit = devinet_exit_net,
+	.async = true,
 };
 
 static struct rtnl_af_ops inet_af_ops __read_mostly = {
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index f05afaf3235c0500a9087eae6365b7001aa64663..ac71c3d496c02d385eeb48506175b0d627b8580d 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1362,6 +1362,7 @@ static void __net_exit fib_net_exit(struct net *net)
 static struct pernet_operations fib_net_ops = {
 	.init = fib_net_init,
 	.exit = fib_net_exit,
+	.async = true,
 };
 
 void __init ip_fib_init(void)
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 1617604c92847d5b0d058fac40dc3707f22348a5..cc56efa64d5cca59f5ce2db91f83ce60da52ed36 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -1257,6 +1257,7 @@ static int __net_init icmp_sk_init(struct net *net)
 static struct pernet_operations __net_initdata icmp_sk_ops = {
        .init = icmp_sk_init,
        .exit = icmp_sk_exit,
+       .async = true,
 };
 
 int __init icmp_init(void)
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index f2402581fef1b559c0952e142a682d596d4be5b5..c2743763777e4ebcadd569c677c1ebdc80405f01 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -3028,6 +3028,7 @@ static void __net_exit igmp_net_exit(struct net *net)
 static struct pernet_operations igmp_net_ops = {
 	.init = igmp_net_init,
 	.exit = igmp_net_exit,
+	.async = true,
 };
 #endif
 
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index bbf1b94942c0ed53d1ddb87e4ee63833c08f2684..5e843ae5e468ee78afdb00db84caac29469856d2 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -885,6 +885,7 @@ static void __net_exit ipv4_frags_exit_net(struct net *net)
 static struct pernet_operations ip4_frags_ops = {
 	.init = ipv4_frags_init_net,
 	.exit = ipv4_frags_exit_net,
+	.async = true,
 };
 
 void __init ipfrag_init(void)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index b05689bbba311d0e8d1b2f30f3c8766e0f28e553..7c7ac9d32e77961a4fa7b5a4a05fe785b6a6810d 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -3327,6 +3327,7 @@ static void __net_exit ipmr_net_exit(struct net *net)
 static struct pernet_operations ipmr_net_ops = {
 	.init = ipmr_net_init,
 	.exit = ipmr_net_exit,
+	.async = true,
 };
 
 int __init ip_mr_init(void)
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index b8f0db54b1978c800c1f606e0d06a015499a2972..0164def9c80847560a29811022eec453d58eeab0 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -1204,6 +1204,7 @@ static void __net_exit ping_v4_proc_exit_net(struct net *net)
 static struct pernet_operations ping_v4_net_ops = {
 	.init = ping_v4_proc_init_net,
 	.exit = ping_v4_proc_exit_net,
+	.async = true,
 };
 
 int __init ping_proc_init(void)
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index dc5edc8f7564d15634fc5528896bb83f1e1ea009..fdabc70283b646fe496a87228f380493eb8fd8ee 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -549,6 +549,7 @@ static __net_exit void ip_proc_exit_net(struct net *net)
 static __net_initdata struct pernet_operations ip_proc_ops = {
 	.init = ip_proc_init_net,
 	.exit = ip_proc_exit_net,
+	.async = true,
 };
 
 int __init ip_misc_proc_init(void)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 9b367fc48d7dde553ae5972481d813c7d313ddb9..54648d20bf0f87e1b9a2cceb7bb18a31c8df319a 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -1156,6 +1156,7 @@ static __net_exit void raw_exit_net(struct net *net)
 static __net_initdata struct pernet_operations raw_net_ops = {
 	.init = raw_init_net,
 	.exit = raw_exit_net,
+	.async = true,
 };
 
 int __init raw_proc_init(void)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 49cc1c1df1bac0c9046f8d34db02c4bef18079e4..9376ed69ffeb50a1bd6b1c6c0497d42b75f854d1 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -417,6 +417,7 @@ static void __net_exit ip_rt_do_proc_exit(struct net *net)
 static struct pernet_operations ip_rt_proc_ops __net_initdata =  {
 	.init = ip_rt_do_proc_init,
 	.exit = ip_rt_do_proc_exit,
+	.async = true,
 };
 
 static int __init ip_rt_proc_init(void)
@@ -2994,6 +2995,7 @@ static __net_exit void sysctl_route_net_exit(struct net *net)
 static __net_initdata struct pernet_operations sysctl_route_ops = {
 	.init = sysctl_route_net_init,
 	.exit = sysctl_route_net_exit,
+	.async = true,
 };
 #endif
 
@@ -3007,6 +3009,7 @@ static __net_init int rt_genid_init(struct net *net)
 
 static __net_initdata struct pernet_operations rt_genid_ops = {
 	.init = rt_genid_init,
+	.async = true,
 };
 
 static int __net_init ipv4_inetpeer_init(struct net *net)
@@ -3032,6 +3035,7 @@ static void __net_exit ipv4_inetpeer_exit(struct net *net)
 static __net_initdata struct pernet_operations ipv4_inetpeer_ops = {
 	.init	=	ipv4_inetpeer_init,
 	.exit	=	ipv4_inetpeer_exit,
+	.async	=	true,
 };
 
 #ifdef CONFIG_IP_ROUTE_CLASSID
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 93e172118a94d33297545135978c0ab6d21ad97b..89683d868b37132297fe8ad9d52180b0c9a0fbfe 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -1219,6 +1219,7 @@ static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 	.init = ipv4_sysctl_init_net,
 	.exit = ipv4_sysctl_exit_net,
+	.async = true,
 };
 
 static __init int sysctl_ipv4_init(void)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f8ad397e285e9b8db0b04f8abc30a42f22294ef9..ac16795486ea8678676e52bfc41ee240aabea0b3 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2387,6 +2387,7 @@ static void __net_exit tcp4_proc_exit_net(struct net *net)
 static struct pernet_operations tcp4_net_ops = {
 	.init = tcp4_proc_init_net,
 	.exit = tcp4_proc_exit_net,
+	.async = true,
 };
 
 int __init tcp4_proc_init(void)
@@ -2573,6 +2574,7 @@ static struct pernet_operations __net_initdata tcp_sk_ops = {
        .init	   = tcp_sk_init,
        .exit	   = tcp_sk_exit,
        .exit_batch = tcp_sk_exit_batch,
+       .async	   = true,
 };
 
 void __init tcp_v4_init(void)
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 03b51cdcc731f5d85cbe51337f864bc8abc40135..aa6fea9f332844450cb474f2bd0ba58103304656 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -1024,6 +1024,7 @@ static void __net_exit tcp_net_metrics_exit_batch(struct list_head *net_exit_lis
 static __net_initdata struct pernet_operations tcp_net_metrics_ops = {
 	.init		=	tcp_net_metrics_init,
 	.exit_batch	=	tcp_net_metrics_exit_batch,
+	.async		=	true,
 };
 
 void __init tcp_metrics_init(void)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index bfaefe560b5ce32bbf383469d8f77795d1322ed9..ac5fac0e59b1ee56a4e141b6c44420c200700a46 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2757,6 +2757,7 @@ static void __net_exit udp4_proc_exit_net(struct net *net)
 static struct pernet_operations udp4_net_ops = {
 	.init = udp4_proc_init_net,
 	.exit = udp4_proc_exit_net,
+	.async = true,
 };
 
 int __init udp4_proc_init(void)
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index f96614e9b9a5d866e6ed01f7624f097c408a84ce..72f2c3806408c78650a51a1dbb54304eab68be3b 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -104,6 +104,7 @@ static void __net_exit udplite4_proc_exit_net(struct net *net)
 static struct pernet_operations udplite4_net_ops = {
 	.init = udplite4_proc_init_net,
 	.exit = udplite4_proc_exit_net,
+	.async = true,
 };
 
 static __init int udplite4_proc_init(void)
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 05017e2c849c12b43715fe4944759a3c91880ee8..753f526cf9dbe339a977afb7d1ec11711e19764a 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -365,6 +365,7 @@ static void __net_exit xfrm4_net_exit(struct net *net)
 static struct pernet_operations __net_initdata xfrm4_net_ops = {
 	.init	= xfrm4_net_init,
 	.exit	= xfrm4_net_exit,
+	.async	= true,
 };
 
 static void __init xfrm4_policy_init(void)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e1846b97ee695e809cefb856835b59b45e4b34a1..8c17f8d8d5d92c6e9bd256aa5c9dcc796209febf 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -6550,6 +6550,7 @@ static void __net_exit addrconf_exit_net(struct net *net)
 static struct pernet_operations addrconf_ops = {
 	.init = addrconf_init_net,
 	.exit = addrconf_exit_net,
+	.async = true,
 };
 
 static struct rtnl_af_ops inet6_ops __read_mostly = {
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 0f6b8172fb9ab1bed02439b130b306b42e22adf6..d72cc786c7b746444c1252781c0b830b857b32af 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -629,6 +629,7 @@ static void __net_exit netfilter_net_exit(struct net *net)
 static struct pernet_operations netfilter_net_ops = {
 	.init = netfilter_net_init,
 	.exit = netfilter_net_exit,
+	.async = true,
 };
 
 int __init netfilter_init(void)
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index c2c1b16b75388516f7f455e4c389d8b1f85fdbce..1ba3da51050d9c5362db4d4fbbeaf2f992365fc2 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -577,6 +577,7 @@ static void __net_exit nf_log_net_exit(struct net *net)
 static struct pernet_operations nf_log_net_ops = {
 	.init = nf_log_net_init,
 	.exit = nf_log_net_exit,
+	.async = true,
 };
 
 int __init netfilter_log_init(void)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 3c8af14330b50f39266129ba9622df4a22ce007b..63cb55d3c2fd470cc8a3dd8245d490734c4938d1 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -253,6 +253,7 @@ static struct pernet_operations netlink_tap_net_ops = {
 	.exit = netlink_tap_exit_net,
 	.id   = &netlink_tap_net_id,
 	.size = sizeof(struct netlink_tap_net),
+	.async = true,
 };
 
 static bool netlink_filter_tap(const struct sk_buff *skb)
@@ -2723,6 +2724,7 @@ static void __init netlink_add_usersock_entry(void)
 static struct pernet_operations __net_initdata netlink_net_ops = {
 	.init = netlink_net_init,
 	.exit = netlink_net_exit,
+	.async = true,
 };
 
 static inline u32 netlink_hash(const void *data, u32 len, u32 seed)
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 6f02499ef00725abb6d249a61fd005dbdd413ac0..a6f63a5faee7c83145ea1fcc02e9fd6514e6a897 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1035,6 +1035,7 @@ static void __net_exit genl_pernet_exit(struct net *net)
 static struct pernet_operations genl_pernet_ops = {
 	.init = genl_pernet_init,
 	.exit = genl_pernet_exit,
+	.async = true,
 };
 
 static int __init genl_init(void)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 616cb9c18f88edd759dfb461051670c225978afa..2c5a6fe5d7497632e45db71b5dae0aef90354711 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4557,6 +4557,7 @@ static void __net_exit packet_net_exit(struct net *net)
 static struct pernet_operations packet_net_ops = {
 	.init = packet_net_init,
 	.exit = packet_net_exit,
+	.async = true,
 };
 
 
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index eba6682727dd9c238da4b48d915a768933be12de..4886ea4a7d6e790660d4d0a86ba021c88c488a4d 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1454,6 +1454,7 @@ static struct pernet_operations tcf_action_net_ops = {
 	.exit = tcf_action_net_exit,
 	.id = &tcf_action_net_id,
 	.size = sizeof(struct tcf_action_net),
+	.async = true,
 };
 
 static int __init tc_action_init(void)
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index d512f49ee83c29143c5aea7315c9d4f2304c71bf..27e672c12492022a79b676216fe774294a5cb1aa 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -2128,6 +2128,7 @@ static void __net_exit psched_net_exit(struct net *net)
 static struct pernet_operations psched_net_ops = {
 	.init = psched_net_init,
 	.exit = psched_net_exit,
+	.async = true,
 };
 
 static int __init pktsched_init(void)
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 9aed6fe1bf1ad67057d5ec001806729cd5988a94..f424539829b764f29adfe53d0886cbfd3db53d4d 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -89,6 +89,7 @@ static void __net_exit sysctl_net_exit(struct net *net)
 static struct pernet_operations sysctl_pernet_ops = {
 	.init = sysctl_net_init,
 	.exit = sysctl_net_exit,
+	.async = true,
 };
 
 static struct ctl_table_header *net_header;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 7236984162422d31435c7ed4b8cf44fbceb745fb..e3eb8806b3e48cd3196bfd0d952929abee0e23d4 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2913,6 +2913,7 @@ static void __net_exit unix_net_exit(struct net *net)
 static struct pernet_operations unix_net_ops = {
 	.init = unix_net_init,
 	.exit = unix_net_exit,
+	.async = true,
 };
 
 static int __init af_unix_init(void)
diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c
index 9efbfc753347bfeac4793111806036c97aaa6435..bc7064486b152d548f7b9c3f4e2a874d7c6e73dd 100644
--- a/net/wireless/wext-core.c
+++ b/net/wireless/wext-core.c
@@ -390,6 +390,7 @@ static void __net_exit wext_pernet_exit(struct net *net)
 static struct pernet_operations wext_pernet_ops = {
 	.init = wext_pernet_init,
 	.exit = wext_pernet_exit,
+	.async = true,
 };
 
 static int __init wireless_nlevent_init(void)
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 7a23078132cf523e83a489d61222bc44f5394c4c..77d9d1ab05ce17838dba0322a0e222add2ed1dc2 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2982,6 +2982,7 @@ static void __net_exit xfrm_net_exit(struct net *net)
 static struct pernet_operations __net_initdata xfrm_net_ops = {
 	.init = xfrm_net_init,
 	.exit = xfrm_net_exit,
+	.async = true,
 };
 
 void __init xfrm_init(void)