[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>
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 78993dad..b5524f3 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -366,7 +366,7 @@
fh->cb = cb;
fh->port = port;
if (sock->type != SOCK_DGRAM) {
- skb->tail = skb->data;
+ skb_reset_tail_pointer(skb);
skb->len = 0;
} else if (res < 0)
goto out_free;