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 --- net/decnet/dn_route.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/decnet/dn_route.c') diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index bb73bf16630..9678b096b84 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1468,7 +1468,7 @@ static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, struct dn_route *rt = (struct dn_route *)skb->dst; struct rtmsg *r; struct nlmsghdr *nlh; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); long expires; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); @@ -1509,7 +1509,7 @@ static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, if (rt->fl.iif) RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); - nlh->nlmsg_len = skb->tail - b; + nlh->nlmsg_len = skb_tail_pointer(skb) - b; return skb->len; nlmsg_failure: -- cgit v1.2.3