diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index a7b04f3..a926cec 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -271,7 +271,7 @@
 		msg_set_bcgap_to(msg, n_ptr->bclink.gap_to);
 		msg_set_bcast_tag(msg, tipc_own_tag);
 
-		if (tipc_bearer_send(&bcbearer->bearer, buf, 0)) {
+		if (tipc_bearer_send(&bcbearer->bearer, buf, NULL)) {
 			bcl->stats.sent_nacks++;
 			buf_discard(buf);
 		} else {
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 64dcb0f..e213a8e 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -45,10 +45,10 @@
 
 #define MAX_ADDR_STR 32
 
-static struct media *media_list = 0;
+static struct media *media_list = NULL;
 static u32 media_count = 0;
 
-struct bearer *tipc_bearers = 0;
+struct bearer *tipc_bearers = NULL;
 
 /**
  * media_name_valid - validate media name
@@ -79,7 +79,7 @@
 		if (!strcmp(m_ptr->name, name))
 			return m_ptr;
 	}
-	return 0;
+	return NULL;
 }
 
 /**
@@ -287,7 +287,7 @@
 		if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
 			return b_ptr;
 	}
-	return 0;
+	return NULL;
 }
 
 /**
@@ -307,7 +307,7 @@
 		if (!strcmp(b_if_name, if_name))
 			return b_ptr;
 	}
-	return 0;
+	return NULL;
 }
 
 /**
@@ -569,7 +569,7 @@
 
 int tipc_block_bearer(const char *name)
 {
-	struct bearer *b_ptr = 0;
+	struct bearer *b_ptr = NULL;
 	struct link *l_ptr;
 	struct link *temp_l_ptr;
 
@@ -666,8 +666,8 @@
 	} else {
 		kfree(tipc_bearers);
 		kfree(media_list);
-		tipc_bearers = 0;
-		media_list = 0;
+		tipc_bearers = NULL;
+		media_list = NULL;
 		res = -ENOMEM;
 	}
 	write_unlock_bh(&tipc_net_lock);
@@ -691,8 +691,8 @@
 	}
 	kfree(tipc_bearers);
 	kfree(media_list);
-	tipc_bearers = 0;
-	media_list = 0;
+	tipc_bearers = NULL;
+	media_list = NULL;
 	media_count = 0;
 }
 
diff --git a/net/tipc/cluster.c b/net/tipc/cluster.c
index ab974ca..9fe45a4 100644
--- a/net/tipc/cluster.c
+++ b/net/tipc/cluster.c
@@ -48,7 +48,7 @@
 			 u32 lower, u32 upper);
 struct sk_buff *tipc_cltr_prepare_routing_msg(u32 data_size, u32 dest);
 
-struct node **tipc_local_nodes = 0;
+struct node **tipc_local_nodes = NULL;
 struct node_map tipc_cltr_bcast_nodes = {0,{0,}};
 u32 tipc_highest_allowed_slave = 0;
 
@@ -61,7 +61,7 @@
 
 	c_ptr = (struct cluster *)kmalloc(sizeof(*c_ptr), GFP_ATOMIC);
 	if (c_ptr == NULL)
-		return 0;
+		return NULL;
 	memset(c_ptr, 0, sizeof(*c_ptr));
 
 	c_ptr->addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
@@ -73,7 +73,7 @@
 	c_ptr->nodes = (struct node **)kmalloc(alloc, GFP_ATOMIC);
 	if (c_ptr->nodes == NULL) {
 		kfree(c_ptr);
-		return 0;
+		return NULL;
 	}
 	memset(c_ptr->nodes, 0, alloc);  
 	if (in_own_cluster(addr))
@@ -91,7 +91,7 @@
 	}
 	else {
 		kfree(c_ptr);
-		c_ptr = 0;
+		c_ptr = NULL;
 	}
 
 	return c_ptr;
@@ -204,7 +204,7 @@
 
 	assert(!in_own_cluster(c_ptr->addr));
 	if (!c_ptr->highest_node)
-		return 0;
+		return NULL;
 
 	/* Start entry must be random */
 	while (mask > c_ptr->highest_node) {
@@ -222,7 +222,7 @@
 		if (tipc_node_has_active_links(c_ptr->nodes[n_num]))
 			return c_ptr->nodes[n_num];
 	}
-	return 0;
+	return NULL;
 }
 
 /*
diff --git a/net/tipc/cluster.h b/net/tipc/cluster.h
index 9963642..1b4cd30 100644
--- a/net/tipc/cluster.h
+++ b/net/tipc/cluster.h
@@ -86,7 +86,7 @@
 
 	if (z_ptr)
 		return z_ptr->clusters[1];
-	return 0;
+	return NULL;
 }
 
 #endif
diff --git a/net/tipc/config.c b/net/tipc/config.c
index 3c8e674..48b5de2 100644
--- a/net/tipc/config.c
+++ b/net/tipc/config.c
@@ -683,11 +683,11 @@
 	memset(&mng, 0, sizeof(mng));
 	INIT_LIST_HEAD(&mng.link_subscribers);
 
-	res = tipc_attach(&mng.user_ref, 0, 0);
+	res = tipc_attach(&mng.user_ref, NULL, NULL);
 	if (res)
 		goto failed;
 
-	res = tipc_createport(mng.user_ref, 0, TIPC_CRITICAL_IMPORTANCE,
+	res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 			      NULL, NULL, NULL,
 			      NULL, cfg_named_msg_event, NULL,
 			      NULL, &mng.port_ref);
diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c
index 4f4beef..26ef95d 100644
--- a/net/tipc/dbg.c
+++ b/net/tipc/dbg.c
@@ -81,7 +81,7 @@
 
 	pb->crs = pb->buf = raw;
 	pb->size = sz;
-	pb->next = 0;
+	pb->next = NULL;
 	pb->buf[0] = 0;
 	pb->buf[sz-1] = ~0;
 }
@@ -216,7 +216,7 @@
                         }
                 }
 		pb_next = pb->next;
-		pb->next = 0;
+		pb->next = NULL;
 		pb = pb_next;
 	}
 	spin_unlock_bh(&print_lock);
diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index 1f8d83b..7a25278 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -169,7 +169,7 @@
 
 static void disable_bearer(struct tipc_bearer *tb_ptr)
 {
-	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = 0;
+	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
 }
 
 /**
@@ -285,7 +285,7 @@
 	for (i = 0; i < MAX_ETH_BEARERS ; i++) {
 		if (eth_bearers[i].bearer) {
 			eth_bearers[i].bearer->blocked = 1;
-			eth_bearers[i].bearer = 0;
+			eth_bearers[i].bearer = NULL;
 		}
 		if (eth_bearers[i].dev) {
 			dev_remove_pack(&eth_bearers[i].tipc_packet_type);
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 511872a..bbdca3b 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -573,7 +573,7 @@
 		if (win <= 0)
 			break;
 		list_del_init(&p_ptr->wait_list);
-		p_ptr->congested_link = 0;
+		p_ptr->congested_link = NULL;
 		assert(p_ptr->wakeup);
 		spin_lock_bh(p_ptr->publ.lock);
 		p_ptr->publ.congested = 0;
@@ -1355,7 +1355,7 @@
 	fragm_crs = 0;
 	fragm_rest = 0;
 	sect_rest = 0;
-	sect_crs = 0;
+	sect_crs = NULL;
 	curr_sect = -1;
 
 	/* Prepare reusable fragment header: */
@@ -1549,7 +1549,7 @@
 			msg_dbg(buf_msg(buf), ">DEF-PROT>");
 			l_ptr->unacked_window = 0;
 			buf_discard(buf);
-			l_ptr->proto_msg_queue = 0;
+			l_ptr->proto_msg_queue = NULL;
 			return TIPC_OK;
 		} else {
 			msg_dbg(buf_msg(buf), "|>DEF-PROT>");
@@ -1860,7 +1860,7 @@
 			struct sk_buff **tail,
 			struct sk_buff *buf)
 {
-	struct sk_buff *prev = 0;
+	struct sk_buff *prev = NULL;
 	struct sk_buff *crs = *head;
 	u32 seq_no = msg_seqno(buf_msg(buf));
 
@@ -1953,7 +1953,7 @@
 void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
 			      u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
 {
-	struct sk_buff *buf = 0;
+	struct sk_buff *buf = NULL;
 	struct tipc_msg *msg = l_ptr->pmsg;
         u32 msg_size = sizeof(l_ptr->proto_msg);
 
@@ -2426,7 +2426,7 @@
 		}
 	}
 exit:
-	*buf = 0;
+	*buf = NULL;
 	buf_discard(tunnel_buf);
 	return 0;
 }
@@ -2586,13 +2586,13 @@
 int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb, 
 			    struct tipc_msg **m)
 {
-	struct sk_buff *prev = 0;
+	struct sk_buff *prev = NULL;
 	struct sk_buff *fbuf = *fb;
 	struct tipc_msg *fragm = buf_msg(fbuf);
 	struct sk_buff *pbuf = *pending;
 	u32 long_msg_seq_no = msg_long_msgno(fragm);
 
-	*fb = 0;
+	*fb = NULL;
 	msg_dbg(fragm,"FRG<REC<");
 
 	/* Is there an incomplete message waiting for this fragment? */
@@ -2670,8 +2670,8 @@
 
 static void link_check_defragm_bufs(struct link *l_ptr)
 {
-	struct sk_buff *prev = 0;
-	struct sk_buff *next = 0;
+	struct sk_buff *prev = NULL;
+	struct sk_buff *next = NULL;
 	struct sk_buff *buf = l_ptr->defragm_buf;
 
 	if (!buf)
@@ -2750,19 +2750,19 @@
 	struct link *l_ptr; 
 
 	if (!link_name_validate(name, &link_name_parts))
-		return 0;
+		return NULL;
 
 	b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
 	if (!b_ptr)
-		return 0;
+		return NULL;
 
 	*node = tipc_node_find(link_name_parts.addr_peer); 
 	if (!*node)
-		return 0;
+		return NULL;
 
 	l_ptr = (*node)->links[b_ptr->identity];
 	if (!l_ptr || strcmp(l_ptr->name, name))
-		return 0;
+		return NULL;
 
 	return l_ptr;
 }
diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
index 830f909..953307a 100644
--- a/net/tipc/name_distr.c
+++ b/net/tipc/name_distr.c
@@ -168,8 +168,8 @@
 void tipc_named_node_up(unsigned long node)
 {
 	struct publication *publ;
-	struct distr_item *item = 0;
-	struct sk_buff *buf = 0;
+	struct distr_item *item = NULL;
+	struct sk_buff *buf = NULL;
 	u32 left = 0;
 	u32 rest;
 	u32 max_item_buf;
@@ -200,7 +200,7 @@
 			    "<%u.%u.%u>\n", tipc_zone(node), 
 			    tipc_cluster(node), tipc_node(node));
 			tipc_link_send(buf, node, node);
-			buf = 0;
+			buf = NULL;
 		}
 	}
 exit:
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 3f4b23b..a865954 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -121,7 +121,7 @@
 		(struct publication *)kmalloc(sizeof(*publ), GFP_ATOMIC);
 	if (publ == NULL) {
 		warn("Memory squeeze; failed to create publication\n");
-		return 0;
+		return NULL;
 	}
 
 	memset(publ, 0, sizeof(*publ));
@@ -168,7 +168,7 @@
 		warn("Memory squeeze; failed to create name sequence\n");
 		kfree(nseq);
 		kfree(sseq);
-		return 0;
+		return NULL;
 	}
 
 	memset(nseq, 0, sizeof(*nseq));
@@ -207,7 +207,7 @@
 		else
 			return &sseqs[mid];
 	}
-	return 0;
+	return NULL;
 }
 
 /**
@@ -263,7 +263,7 @@
 
 		if ((sseq->lower != lower) || (sseq->upper != upper)) {
 			warn("Overlapping publ <%u,%u,%u>\n", type, lower, upper);
-			return 0;
+			return NULL;
 		}
 	} else {
 		u32 inspos;
@@ -278,7 +278,7 @@
 		if ((inspos < nseq->first_free) &&
 		    (upper >= nseq->sseqs[inspos].lower)) {
 			warn("Overlapping publ <%u,%u,%u>\n", type, lower, upper);
-			return 0;
+			return NULL;
 		}
 
 		/* Ensure there is space for new sub-sequence */
@@ -294,7 +294,7 @@
 				nseq->alloc *= 2;
 			} else {
 				warn("Memory squeeze; failed to create sub-sequence\n");
-				return 0;
+				return NULL;
 			}
 		}
 		dbg("Have %u sseqs for type %u\n", nseq->alloc, type);
@@ -319,7 +319,7 @@
 
 	publ = publ_create(type, lower, upper, scope, node, port, key);
 	if (!publ)
-		return 0;
+		return NULL;
 	dbg("inserting publ %x, node=%x publ->node=%x, subscr->node=%x\n",
 	    publ, node, publ->node, publ->subscr.node);
 
@@ -394,7 +394,7 @@
 			    i, &nseq->sseqs[i], nseq->sseqs[i].lower,
 			    nseq->sseqs[i].upper);
 		}
-		return 0;
+		return NULL;
 	}
 	dbg("nameseq_remove: seq: %x, sseq %x, <%u,%u> key %u\n",
 	    nseq, sseq, nseq->type, inst, key);
@@ -413,7 +413,7 @@
 		prev->zone_list_next = publ->zone_list_next;
 		sseq->zone_list = publ->zone_list_next;
 	} else {
-		sseq->zone_list = 0;
+		sseq->zone_list = NULL;
 	}
 
 	if (in_own_cluster(node)) {
@@ -431,7 +431,7 @@
 			prev->cluster_list_next = publ->cluster_list_next;
 			sseq->cluster_list = publ->cluster_list_next;
 		} else {
-			sseq->cluster_list = 0;
+			sseq->cluster_list = NULL;
 		}
 	}
 
@@ -450,7 +450,7 @@
 			prev->node_list_next = publ->node_list_next;
 			sseq->node_list = publ->node_list_next;
 		} else {
-			sseq->node_list = 0;
+			sseq->node_list = NULL;
 		}
 	}
 	assert(!publ->node || (publ->node == node));
@@ -535,7 +535,7 @@
 		}
 	}
 
-	return 0;
+	return NULL;
 };
 
 struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
@@ -547,7 +547,7 @@
 	if (lower > upper) {
 		warn("Failed to publish illegal <%u,%u,%u>\n",
 		     type, lower, upper);
-		return 0;
+		return NULL;
 	}
 
 	dbg("Publishing <%u,%u,%u> from %x\n", type, lower, upper, node);
@@ -556,7 +556,7 @@
 		dbg("tipc_nametbl_insert_publ: created %x\n", seq);
 	}
 	if (!seq)
-		return 0;
+		return NULL;
 
 	assert(seq->type == type);
 	return tipc_nameseq_insert_publ(seq, type, lower, upper,
@@ -570,7 +570,7 @@
 	struct name_seq *seq = nametbl_find_seq(type);
 
 	if (!seq)
-		return 0;
+		return NULL;
 
 	dbg("Withdrawing <%u,%u> from %x\n", type, lower, node);
 	publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
@@ -594,7 +594,7 @@
 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 {
 	struct sub_seq *sseq;
-	struct publication *publ = 0;
+	struct publication *publ = NULL;
 	struct name_seq *seq;
 	u32 ref;
 
@@ -740,12 +740,12 @@
 	if (table.local_publ_count >= tipc_max_publications) {
 		warn("Failed publish: max %u local publication\n", 
 		     tipc_max_publications);
-		return 0;
+		return NULL;
 	}
 	if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
 		warn("Failed to publish reserved name <%u,%u,%u>\n",
 		     type, lower, upper);
-		return 0;
+		return NULL;
 	}
 
 	write_lock_bh(&tipc_nametbl_lock);
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 074891a..cd03286 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -116,7 +116,7 @@
 */
 
 rwlock_t tipc_net_lock = RW_LOCK_UNLOCKED;
-struct network tipc_net = { 0 };
+struct network tipc_net = { NULL };
 
 struct node *tipc_net_select_remote_node(u32 addr, u32 ref) 
 {
@@ -181,7 +181,7 @@
 		tipc_zone_delete(tipc_net.zones[z_num]);
 	}
 	kfree(tipc_net.zones);
-	tipc_net.zones = 0;
+	tipc_net.zones = NULL;
 }
 
 static void net_route_named_msg(struct sk_buff *buf)
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 6d65010..9f23845 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -155,7 +155,7 @@
 	u32 i;
 	u32 highest_prio = 0;
 
-        active[0] = active[1] = 0;
+        active[0] = active[1] = NULL;
 
 	for (i = 0; i < MAX_BEARERS; i++) {
                 struct link *l_ptr = n_ptr->links[i];
@@ -240,7 +240,7 @@
 
                         err("Attempt to create third link to %s\n",
 			    addr_string_fill(addr_string, n_ptr->addr));
-                        return 0;
+                        return NULL;
                 }
 
                 if (!n_ptr->links[bearer_id]) {
@@ -253,12 +253,12 @@
                     l_ptr->b_ptr->publ.name, 
 		    addr_string_fill(addr_string, l_ptr->addr));
         }
-	return 0;
+	return NULL;
 }
 
 void tipc_node_detach_link(struct node *n_ptr, struct link *l_ptr)
 {
-	n_ptr->links[l_ptr->b_ptr->identity] = 0;
+	n_ptr->links[l_ptr->b_ptr->identity] = NULL;
 	tipc_net.zones[tipc_zone(l_ptr->addr)]->links--;
 	n_ptr->link_cnt--;
 }
@@ -424,7 +424,7 @@
 
 	/* Notify subscribers */
 	list_for_each_entry_safe(ns, tns, &n_ptr->nsub, nodesub_list) {
-                ns->node = 0;
+                ns->node = NULL;
 		list_del_init(&ns->nodesub_list);
 		tipc_k_signal((Handler)ns->handle_node_down,
 			      (unsigned long)ns->usr_handle);
@@ -443,7 +443,7 @@
 	u32 router_addr;
 
         if (!tipc_addr_domain_valid(addr))
-                return 0;
+                return NULL;
 
 	/* Look for direct link to destination processsor */
 	n_ptr = tipc_node_find(addr);
@@ -452,7 +452,7 @@
 
 	/* Cluster local system nodes *must* have direct links */
 	if (!is_slave(addr) && in_own_cluster(addr))
-		return 0;
+		return NULL;
 
 	/* Look for cluster local router with direct link to node */
 	router_addr = tipc_node_select_router(n_ptr, selector);
@@ -462,7 +462,7 @@
 	/* Slave nodes can only be accessed within own cluster via a 
 	   known router with direct link -- if no router was found,give up */
 	if (is_slave(addr))
-		return 0;
+		return NULL;
 
 	/* Inter zone/cluster -- find any direct link to remote cluster */
 	addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
@@ -475,7 +475,7 @@
 	if (router_addr) 
                 return tipc_node_select(router_addr, selector);
 
-        return 0;
+        return NULL;
 }
 
 /**
diff --git a/net/tipc/node.h b/net/tipc/node.h
index 29f7ae6..781126e 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -121,7 +121,7 @@
 		if (c_ptr)
 			return c_ptr->nodes[tipc_node(addr)];
 	}
-	return 0;
+	return NULL;
 }
 
 static inline struct node *tipc_node_select(u32 addr, u32 selector)
diff --git a/net/tipc/node_subscr.c b/net/tipc/node_subscr.c
index afeea12..cff4068 100644
--- a/net/tipc/node_subscr.c
+++ b/net/tipc/node_subscr.c
@@ -47,7 +47,7 @@
 void tipc_nodesub_subscribe(struct node_subscr *node_sub, u32 addr, 
 		       void *usr_handle, net_ev_handler handle_down)
 {
-	node_sub->node = 0;
+	node_sub->node = NULL;
 	if (addr == tipc_own_addr)
 		return;
 	if (!tipc_addr_node_valid(addr)) {
diff --git a/net/tipc/port.c b/net/tipc/port.c
index 72aae52..294375c 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -54,8 +54,8 @@
 
 #define MAX_REJECT_SIZE 1024
 
-static struct sk_buff *msg_queue_head = 0;
-static struct sk_buff *msg_queue_tail = 0;
+static struct sk_buff *msg_queue_head = NULL;
+static struct sk_buff *msg_queue_tail = NULL;
 
 spinlock_t tipc_port_list_lock = SPIN_LOCK_UNLOCKED;
 static spinlock_t queue_lock = SPIN_LOCK_UNLOCKED;
@@ -258,11 +258,11 @@
 	p_ptr->publ.usr_handle = usr_handle;
 	INIT_LIST_HEAD(&p_ptr->wait_list);
 	INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
-	p_ptr->congested_link = 0;
+	p_ptr->congested_link = NULL;
 	p_ptr->max_pkt = MAX_PKT_DEFAULT;
 	p_ptr->dispatcher = dispatcher;
 	p_ptr->wakeup = wakeup;
-	p_ptr->user_port = 0;
+	p_ptr->user_port = NULL;
 	k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 	spin_lock_bh(&tipc_port_list_lock);
 	INIT_LIST_HEAD(&p_ptr->publications);
@@ -276,9 +276,9 @@
 int tipc_deleteport(u32 ref)
 {
 	struct port *p_ptr;
-	struct sk_buff *buf = 0;
+	struct sk_buff *buf = NULL;
 
-	tipc_withdraw(ref, 0, 0);
+	tipc_withdraw(ref, 0, NULL);
 	p_ptr = tipc_port_lock(ref);
 	if (!p_ptr) 
 		return -EINVAL;
@@ -329,7 +329,7 @@
 
 	p_ptr = tipc_port_lock(ref);
 	if (!p_ptr)
-		return 0;
+		return NULL;
 	handle = p_ptr->publ.usr_handle;
 	tipc_port_unlock(p_ptr);
 	return handle;
@@ -475,7 +475,7 @@
 
 	/* send self-abort message when rejecting on a connected port */
 	if (msg_connected(msg)) {
-		struct sk_buff *abuf = 0;
+		struct sk_buff *abuf = NULL;
 		struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 
 		if (p_ptr) {
@@ -510,7 +510,7 @@
 static void port_timeout(unsigned long ref)
 {
 	struct port *p_ptr = tipc_port_lock(ref);
-	struct sk_buff *buf = 0;
+	struct sk_buff *buf = NULL;
 
 	if (!p_ptr || !p_ptr->publ.connected)
 		return;
@@ -540,7 +540,7 @@
 static void port_handle_node_down(unsigned long ref)
 {
 	struct port *p_ptr = tipc_port_lock(ref);
-	struct sk_buff* buf = 0;
+	struct sk_buff* buf = NULL;
 
 	if (!p_ptr)
 		return;
@@ -555,7 +555,7 @@
 	u32 imp = msg_importance(&p_ptr->publ.phdr);
 
 	if (!p_ptr->publ.connected)
-		return 0;
+		return NULL;
 	if (imp < TIPC_CRITICAL_IMPORTANCE)
 		imp++;
 	return port_build_proto_msg(p_ptr->publ.ref,
@@ -575,7 +575,7 @@
 	u32 imp = msg_importance(&p_ptr->publ.phdr);
 
 	if (!p_ptr->publ.connected)
-		return 0;
+		return NULL;
 	if (imp < TIPC_CRITICAL_IMPORTANCE)
 		imp++;
 	return port_build_proto_msg(port_peerport(p_ptr),
@@ -594,8 +594,8 @@
 	struct tipc_msg *msg = buf_msg(buf);
 	struct port *p_ptr = tipc_port_lock(msg_destport(msg));
 	u32 err = TIPC_OK;
-	struct sk_buff *r_buf = 0;
-	struct sk_buff *abort_buf = 0;
+	struct sk_buff *r_buf = NULL;
+	struct sk_buff *abort_buf = NULL;
 
 	msg_dbg(msg, "PORT<RECV<:");
 
@@ -804,7 +804,7 @@
 
 	spin_lock_bh(&queue_lock);
 	buf = msg_queue_head;
-	msg_queue_head = 0;
+	msg_queue_head = NULL;
 	spin_unlock_bh(&queue_lock);
 
 	while (buf) {
@@ -991,8 +991,8 @@
 {
 	struct port *p_ptr;
 	struct user_port *up_ptr;
-	tipc_continue_event cb = 0;
-	void *uh = 0;
+	tipc_continue_event cb = NULL;
+	void *uh = NULL;
 
 	p_ptr = tipc_port_lock(ref);
 	if (p_ptr) {
@@ -1016,7 +1016,7 @@
 void tipc_acknowledge(u32 ref, u32 ack)
 {
 	struct port *p_ptr;
-	struct sk_buff *buf = 0;
+	struct sk_buff *buf = NULL;
 
 	p_ptr = tipc_port_lock(ref);
 	if (!p_ptr)
@@ -1062,7 +1062,7 @@
 	if (up_ptr == NULL) {
 		return -ENOMEM;
 	}
-	ref = tipc_createport_raw(0, port_dispatcher, port_wakeup, importance);
+	ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
 	p_ptr = tipc_port_lock(ref);
 	if (!p_ptr) {
 		kfree(up_ptr);
@@ -1273,7 +1273,7 @@
 int tipc_shutdown(u32 ref)
 {
 	struct port *p_ptr;
-	struct sk_buff *buf = 0;
+	struct sk_buff *buf = NULL;
 
 	p_ptr = tipc_port_lock(ref);
 	if (!p_ptr)
diff --git a/net/tipc/ref.c b/net/tipc/ref.c
index 5a13c2d..33bbf50 100644
--- a/net/tipc/ref.c
+++ b/net/tipc/ref.c
@@ -61,7 +61,7 @@
  * because entry 0's reference field has the form XXXX|1--1.
  */
 
-struct ref_table tipc_ref_table = { 0 };
+struct ref_table tipc_ref_table = { NULL };
 
 static rwlock_t ref_table_lock = RW_LOCK_UNLOCKED;
 
@@ -86,7 +86,7 @@
 	write_lock_bh(&ref_table_lock);
 	index_mask = sz - 1;
 	for (i = sz - 1; i >= 0; i--) {
-		table[i].object = 0;
+		table[i].object = NULL;
 		table[i].lock = SPIN_LOCK_UNLOCKED;
 		table[i].data.next_plus_upper = (start & ~index_mask) + i - 1;
 	}
@@ -108,7 +108,7 @@
 		return;
 
 	vfree(tipc_ref_table.entries);
-	tipc_ref_table.entries = 0;
+	tipc_ref_table.entries = NULL;
 }
 
 /**
@@ -173,7 +173,7 @@
 	assert(entry->data.reference == ref);
 
 	/* mark entry as unused */
-	entry->object = 0;
+	entry->object = NULL;
 	if (tipc_ref_table.first_free == 0)
 		tipc_ref_table.first_free = index;
 	else
diff --git a/net/tipc/ref.h b/net/tipc/ref.h
index 4f8f9f40..6d20006 100644
--- a/net/tipc/ref.h
+++ b/net/tipc/ref.h
@@ -92,7 +92,7 @@
 			return r->object;
 		spin_unlock_bh(&r->lock);
 	}
-	return 0;
+	return NULL;
 }
 
 /**
@@ -125,7 +125,7 @@
 		if (likely(r->data.reference == ref))
 			return r->object;
 	}
-	return 0;
+	return NULL;
 }
 
 #endif
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 67253bf..d1347d7 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -178,7 +178,7 @@
 	if (unlikely(protocol != 0))
 		return -EPROTONOSUPPORT;
 
-	ref = tipc_createport_raw(0, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
+	ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
 	if (unlikely(!ref))
 		return -ENOMEM;
 
@@ -265,7 +265,7 @@
 		sock_lock(tsock);
 		buf = skb_dequeue(&sk->sk_receive_queue);
 		if (!buf)
-			tsock->p->usr_handle = 0;
+			tsock->p->usr_handle = NULL;
 		sock_unlock(tsock);
 		if (!buf)
 			break;
@@ -319,7 +319,7 @@
 		return -ERESTARTSYS;
 	
 	if (unlikely(!uaddr_len)) {
-		res = tipc_withdraw(tsock->p->ref, 0, 0);
+		res = tipc_withdraw(tsock->p->ref, 0, NULL);
 		goto exit;
 	}
 
@@ -1226,7 +1226,7 @@
 {
    struct tipc_sock *tsock = tipc_sk(sock->sk);
    struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
-   struct msghdr m = {0,};
+   struct msghdr m = {NULL,};
    struct sk_buff *buf;
    struct tipc_msg *msg;
    int res;
@@ -1251,7 +1251,7 @@
    /* Send a 'SYN-' to destination */
 
    m.msg_name = dest;
-   if ((res = send_msg(0, sock, &m, 0)) < 0) {
+   if ((res = send_msg(NULL, sock, &m, 0)) < 0) {
 	   sock->state = SS_DISCONNECTING;
 	   return res;
    }
@@ -1367,9 +1367,9 @@
 
 		msg_dbg(msg,"<ACC<: ");
                 if (!msg_data_sz(msg)) {
-                        struct msghdr m = {0,};
+                        struct msghdr m = {NULL,};
 
-                        send_packet(0, newsock, &m, 0);      
+                        send_packet(NULL, newsock, &m, 0);
                         advance_queue(tsock);
                 } else {
 			sock_lock(tsock);
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 5ff38b9..3ec4e2b 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -381,7 +381,7 @@
 				   struct tipc_name_seq const *dest)
 {
 	struct subscriber *subscriber;
-	struct iovec msg_sect = {0, 0};
+	struct iovec msg_sect = {NULL, 0};
 	spinlock_t *subscriber_lock;
 
 	dbg("subscr_named_msg_event: orig = %x own = %x,\n",
@@ -413,13 +413,13 @@
 	tipc_createport(topsrv.user_ref,
 			(void *)(unsigned long)subscriber->ref,
 			importance,
-			0,
-			0,
+			NULL,
+			NULL,
 			subscr_conn_shutdown_event,
-			0,
-			0,
+			NULL,
+			NULL,
 			subscr_conn_msg_event,
-			0,
+			NULL,
 			&subscriber->port_ref);
 	if (subscriber->port_ref == 0) {
 		warn("Memory squeeze; failed to create subscription port\n");
@@ -461,22 +461,22 @@
 	INIT_LIST_HEAD(&topsrv.subscriber_list);
 
 	spin_lock_bh(&topsrv.lock);
-	res = tipc_attach(&topsrv.user_ref, 0, 0);
+	res = tipc_attach(&topsrv.user_ref, NULL, NULL);
 	if (res) {
 		spin_unlock_bh(&topsrv.lock);
 		return res;
 	}
 
  	res = tipc_createport(topsrv.user_ref,
- 			      0,
+ 			      NULL,
  			      TIPC_CRITICAL_IMPORTANCE,
- 			      0,
- 			      0,
- 			      0,
- 			      0,
+ 			      NULL,
+ 			      NULL,
+ 			      NULL,
+ 			      NULL,
  			      subscr_named_msg_event,
- 			      0,
- 			      0,
+ 			      NULL,
+ 			      NULL,
  			      &topsrv.setup_port);
  	if (res)
 		goto failed;
diff --git a/net/tipc/user_reg.c b/net/tipc/user_reg.c
index 106200d..3f3f933 100644
--- a/net/tipc/user_reg.c
+++ b/net/tipc/user_reg.c
@@ -65,7 +65,7 @@
 #define MAX_USERID 64
 #define USER_LIST_SIZE ((MAX_USERID + 1) * sizeof(struct tipc_user))
 
-static struct tipc_user *users = 0;
+static struct tipc_user *users = NULL;
 static u32 next_free_user = MAX_USERID + 1;
 static spinlock_t reg_lock = SPIN_LOCK_UNLOCKED;
 
@@ -149,7 +149,7 @@
 			reg_callback(&users[id]);
 	}
 	kfree(users);
-	users = 0;
+	users = NULL;
 }
 
 /**
diff --git a/net/tipc/zone.c b/net/tipc/zone.c
index 7c11f7f..2803e1b 100644
--- a/net/tipc/zone.c
+++ b/net/tipc/zone.c
@@ -44,11 +44,11 @@
 
 struct _zone *tipc_zone_create(u32 addr)
 {
-	struct _zone *z_ptr = 0;
+	struct _zone *z_ptr = NULL;
 	u32 z_num;
 
 	if (!tipc_addr_domain_valid(addr))
-		return 0;
+		return NULL;
 
 	z_ptr = (struct _zone *)kmalloc(sizeof(*z_ptr), GFP_ATOMIC);
 	if (z_ptr != NULL) {
@@ -114,10 +114,10 @@
 	u32 c_num;
 
 	if (!z_ptr)
-		return 0;
+		return NULL;
 	c_ptr = z_ptr->clusters[tipc_cluster(addr)];
 	if (!c_ptr)
-		return 0;
+		return NULL;
 	n_ptr = tipc_cltr_select_node(c_ptr, ref);
 	if (n_ptr)
 		return n_ptr;
@@ -126,12 +126,12 @@
 	for (c_num = 1; c_num <= tipc_max_clusters; c_num++) {
 		c_ptr = z_ptr->clusters[c_num];
 		if (!c_ptr)
-			return 0;
+			return NULL;
 		n_ptr = tipc_cltr_select_node(c_ptr, ref);
 		if (n_ptr)
 			return n_ptr;
 	}
-	return 0;
+	return NULL;
 }
 
 u32 tipc_zone_select_router(struct _zone *z_ptr, u32 addr, u32 ref)