[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 <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/atm/lec.c b/net/atm/lec.c
index d339645dc796..a8c6b285e06c 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -283,7 +283,7 @@ static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         DPRINTK("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
-                (long)skb->head, (long)skb->data, (long)skb->tail,
+                (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
                 (long)skb->end);
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
         if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)