From 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 19 Apr 2007 20:29:13 -0700 Subject: [SK_BUFF]: Convert skb->tail to sk_buff_data_t So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes on 64bit architectures, allowing us to combine the 4 bytes hole left by the layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4 64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN... :-) Many calculations that previously required that skb->{transport,network, mac}_header be first converted to a pointer now can be done directly, being meaningful as offsets or pointers. Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- include/linux/netlink.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/netlink.h') diff --git a/include/linux/netlink.h b/include/linux/netlink.h index a9d3ad5bc80f..68a632b372ec 100644 --- a/include/linux/netlink.h +++ b/include/linux/netlink.h @@ -229,7 +229,7 @@ __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) (cb)->nlh->nlmsg_seq, type, len, flags) #define NLMSG_END(skb, nlh) \ -({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \ +({ (nlh)->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)(nlh); \ (skb)->len; }) #define NLMSG_CANCEL(skb, nlh) \ -- cgit v1.2.3