[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/drivers/usb/net/gl620a.c b/drivers/usb/net/gl620a.c
index d257a8e026d6..031cf5ca4dbb 100644
--- a/drivers/usb/net/gl620a.c
+++ b/drivers/usb/net/gl620a.c
@@ -157,7 +157,7 @@ genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
                 if ((headroom < (4 + 4*1)) || (tailroom < padlen)) {
                         skb->data = memmove(skb->head + (4 + 4*1),
                                              skb->data, skb->len);
-                        skb->tail = skb->data + skb->len;
+                        skb_set_tail_pointer(skb, skb->len);
                 }
         } else {
                 struct sk_buff  *skb2;