[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>
diff --git a/security/selinux/netlink.c b/security/selinux/netlink.c
index e203883..33f2e06 100644
--- a/security/selinux/netlink.c
+++ b/security/selinux/netlink.c
@@ -66,7 +66,7 @@
static void selnl_notify(int msgtype, void *data)
{
int len;
- unsigned char *tmp;
+ sk_buff_data_t tmp;
struct sk_buff *skb;
struct nlmsghdr *nlh;