[NET]: Annotate __skb_checksum_complete() and friends.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index b797a37..a689660 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -162,11 +162,11 @@
 	return 0;
 }
 
-unsigned int nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
+__sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
 			    unsigned int dataoff, u_int8_t protocol)
 {
 	struct iphdr *iph = skb->nh.iph;
-	unsigned int csum = 0;
+	__sum16 csum = 0;
 
 	switch (skb->ip_summed) {
 	case CHECKSUM_COMPLETE:
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6ab3423..9304034 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3790,9 +3790,9 @@
 	return err;
 }
 
-static int __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb)
+static __sum16 __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb)
 {
-	int result;
+	__sum16 result;
 
 	if (sock_owned_by_user(sk)) {
 		local_bh_enable();
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 0ca8dea..dadf802 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1544,7 +1544,7 @@
 	return sk;
 }
 
-static int tcp_v4_checksum_init(struct sk_buff *skb)
+static __sum16 tcp_v4_checksum_init(struct sk_buff *skb)
 {
 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
 		if (!tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,