[PATCH 2/2] Eliminate unused argument from sk_stream_alloc_pskb

[PATCH 2/2] Eliminate unused argument from sk_stream_alloc_pskb

[Pavel Emelyanov]

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

Question: is this 2.6.24 material (good space saving) or should I
rework this against 2.6.25 (it applies with fuzzes, but seems to
compile)?

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>

---

diff --git a/include/net/sock.h b/include/net/sock.h
index 492dc4a..a469ed8 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1230,15 +1230,7 @@ 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)
 {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 0dfda20..1965c37 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -501,8 +501,7 @@ static inline void tcp_push(struct sock *sk, int flags, int mss_now,
 	}
 }
 
-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;
 
@@ -511,7 +510,6 @@ 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
@@ -564,8 +562,7 @@ new_segment:
 			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;
 
@@ -745,8 +742,8 @@ new_segment:
 				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;
 
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index e5130a7..132e16b 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1183,7 +1183,7 @@ 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;
 
-- 
1.5.3.4

Re: [PATCH 2/2] Eliminate unused argument from sk_stream_alloc_pskb

[Herbert Xu]

On Mon, Nov 26, 2007 at 08:17:27PM +0300, Pavel Emelyanov wrote:
> 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

Also applied to net-2.6.25.  Thanks.

> Question: is this 2.6.24 material (good space saving) or should I
> rework this against 2.6.25 (it applies with fuzzes, but seems to
> compile)?

I guess I've answered this question :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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