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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2007-04-19 20:29:13 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:26:28 -0700 |
| commit | 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch) | |
| tree | 5a267e40f9b94014be38dad5de0a52b6628834e0 /net/netlink | |
| parent | [VLAN] vlan_dev: Use skb_reset_network_header(). (diff) | |
| download | linux-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz linux-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.zip | |
[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 'net/netlink')
| -rw-r--r-- | net/netlink/af_netlink.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 50dc5edb7752..fdb6eb13cbcb 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -785,7 +785,7 @@ static inline struct sk_buff *netlink_trim(struct sk_buff *skb, skb_orphan(skb); - delta = skb->end - skb->tail; + delta = skb->end - skb_tail_pointer(skb); if (delta * 2 < skb->truesize) return skb; |