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[SK_BUFF]: Convert skb->tail to sk_buff_data_t

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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>
This commit is contained in:
Arnaldo Carvalho de Melo
2007-04-19 20:29:13 -07:00
committed by David S. Miller
parent be8bd86321
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
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drivers/isdn/i4l/isdn_net.c
+1 -1
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@@ -881,7 +881,7 @@ isdn_net_log_skb(struct sk_buff * skb, isdn_net_local * lp)
addinfo[0] = '\0';
/* This check stolen from 2.1.72 dev_queue_xmit_nit() */
if (p < skb->data || p >= skb->tail) {
if (p < skb->data || skb->network_header >= skb->tail) {
/* fall back to old isdn_net_log_packet method() */
char * buf = skb->data;