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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-19 20:29:13 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:26:28 -0700
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /drivers/net/macb.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
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[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>
Diffstat (limited to 'drivers/net/macb.c')
-rw-r--r--drivers/net/macb.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 0c3649be0d0..98bf51afcee 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -575,7 +575,8 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
int i;
dev_dbg(&bp->pdev->dev,
"start_xmit: len %u head %p data %p tail %p end %p\n",
- skb->len, skb->head, skb->data, skb->tail, skb->end);
+ skb->len, skb->head, skb->data,
+ skb_tail_pointer(skb), skb->end);
dev_dbg(&bp->pdev->dev,
"data:");
for (i = 0; i < 16; i++)