[NET]: Eliminate unused argument from sk_stream_alloc_pskb

The 3rd argument is always zero (according to grep :) Eliminate
it and merge the function with sk_stream_alloc_skb.

This saves 44 more bytes, and together with the previous patch
we have:

add/remove: 1/0 grow/shrink: 0/8 up/down: 183/-751 (-568)
function                                     old     new   delta
sk_stream_alloc_skb                            -     183    +183
ip_rt_init                                   529     525      -4
arp_ignore                                   112     107      -5
__inet_lookup_listener                       284     274     -10
tcp_sendmsg                                 2583    2481    -102
tcp_sendpage                                1449    1300    -149
tso_fragment                                 417     258    -159
tcp_fragment                                1149     988    -161
__tcp_push_pending_frames                   1998    1837    -161

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sock.h

@@ -1192,15 +1192,7 @@ static inline void sk_stream_moderate_sndbuf(struct sock *sk)
 	}
 }
 
-struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
-		int size, int mem, gfp_t gfp);
-
-static inline struct sk_buff *sk_stream_alloc_skb(struct sock *sk,
-						  int size,
-						  gfp_t gfp)
-{
-	return sk_stream_alloc_pskb(sk, size, 0, gfp);
-}
+struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp);
 
 static inline struct page *sk_stream_alloc_page(struct sock *sk)
 {

net/ipv4/tcp.c

@@ -629,8 +629,7 @@ ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos,
 	return ret;
 }
 
-struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
-		int size, int mem, gfp_t gfp)
+struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp)
 {
 	struct sk_buff *skb;
 
@@ -639,7 +638,6 @@ struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
 
 	skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp);
 	if (skb) {
-		skb->truesize += mem;
 		if (sk_stream_wmem_schedule(sk, skb->truesize)) {
 			/*
 			 * Make sure that we have exactly size bytes
@@ -692,8 +690,7 @@ static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffse
 			if (!sk_stream_memory_free(sk))
 				goto wait_for_sndbuf;
 
-			skb = sk_stream_alloc_pskb(sk, 0, 0,
-						   sk->sk_allocation);
+			skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation);
 			if (!skb)
 				goto wait_for_memory;
 
@@ -873,8 +870,8 @@ int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 				if (!sk_stream_memory_free(sk))
 					goto wait_for_sndbuf;
 
-				skb = sk_stream_alloc_pskb(sk, select_size(sk),
-							   0, sk->sk_allocation);
+				skb = sk_stream_alloc_skb(sk, select_size(sk),
+						sk->sk_allocation);
 				if (!skb)
 					goto wait_for_memory;
 

net/ipv4/tcp_output.c

@@ -1180,7 +1180,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
 	if (skb->len != skb->data_len)
 		return tcp_fragment(sk, skb, len, mss_now);
 
-	buff = sk_stream_alloc_pskb(sk, 0, 0, GFP_ATOMIC);
+	buff = sk_stream_alloc_skb(sk, 0, GFP_ATOMIC);
 	if (unlikely(buff == NULL))
 		return -ENOMEM;