From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Fri, 20 Apr 2007 03:29:13 +0000 (-0700)
Subject: [SK_BUFF]: Convert skb->tail to sk_buff_data_t
X-Git-Tag: v2.6.22-rc1~1128^2~258
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26;p=pandora-kernel.git

[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>
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