netlink: Rename pid to portid to avoid confusion

It is a frequent mistake to confuse the netlink port identifier with a
process identifier.  Try to reduce this confusion by renaming fields
that hold port identifiers portid instead of pid.

I have carefully avoided changing the structures exported to
userspace to avoid changing the userspace API.

I have successfully built an allyesconfig kernel with this change.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index eb6a636..0b01715 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -470,10 +470,10 @@
 static int ip6addrlbl_fill(struct sk_buff *skb,
 			   struct ip6addrlbl_entry *p,
 			   u32 lseq,
-			   u32 pid, u32 seq, int event,
+			   u32 portid, u32 seq, int event,
 			   unsigned int flags)
 {
-	struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq, event,
+	struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
 					 sizeof(struct ifaddrlblmsg), flags);
 	if (!nlh)
 		return -EMSGSIZE;
@@ -503,7 +503,7 @@
 		    net_eq(ip6addrlbl_net(p), net)) {
 			if ((err = ip6addrlbl_fill(skb, p,
 						   ip6addrlbl_table.seq,
-						   NETLINK_CB(cb->skb).pid,
+						   NETLINK_CB(cb->skb).portid,
 						   cb->nlh->nlmsg_seq,
 						   RTM_NEWADDRLABEL,
 						   NLM_F_MULTI)) <= 0)
@@ -574,7 +574,7 @@
 	}
 
 	err = ip6addrlbl_fill(skb, p, lseq,
-			      NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
+			      NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
 			      RTM_NEWADDRLABEL, 0);
 
 	ip6addrlbl_put(p);
@@ -585,7 +585,7 @@
 		goto out;
 	}
 
-	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
+	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 out:
 	return err;
 }