commit 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26
author Arnaldo Carvalho de Melo <acme@redhat.com> Thu Apr 19 20:29:13 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Wed Apr 25 22:26:28 2007 -0700
tree 5a267e40f9b94014be38dad5de0a52b6628834e0
parent be8bd86321fa7f06359d866ef61fb4d2f3e9dce9

[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>