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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-19 23:29:13 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 01:26:28 -0400
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /drivers/atm/idt77252.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
[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/atm/idt77252.c')
-rw-r--r--drivers/atm/idt77252.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index b4b80140c398..1e49799cd6cf 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -1816,7 +1816,8 @@ push_rx_skb(struct idt77252_dev *card, struct sk_buff *skb, int queue)
1816 u32 handle; 1816 u32 handle;
1817 u32 addr; 1817 u32 addr;
1818 1818
1819 skb->data = skb->tail = skb->head; 1819 skb->data = skb->head;
1820 skb_reset_tail_pointer(skb);
1820 skb->len = 0; 1821 skb->len = 0;
1821 1822
1822 skb_reserve(skb, 16); 1823 skb_reserve(skb, 16);