o net: create struct sock_common and use in struct sock & tcp_tw_bucket

With this the data dependency is reduced to just making sure that the first
member of both struct sock and struct tcp_tw_bucket are a struct sock_common.

Also makes it easier to grep for struct sock and struct tcp_tw_bucket usage in
the tree as all the members in those structs are prefixed, respectively, with
sk_ and tw_, like struct inode (i_), struct block_device (bd_), etc.

Checked namespace with make tags/ctags, just one colision with the macros for
the struct sock members, with a wanrouter struct, fixed that
s/sk_state/state_sk/g in the wanrouter struct.

Checked as well if the names of the members in both structs collided with some
macro, none found.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 50fdde2d8a9f..0bc21b4e19eb 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -229,7 +229,7 @@ struct tcp6_sock {
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 #define __ipv6_only_sock(sk)	(inet6_sk(sk)->ipv6only)
-#define ipv6_only_sock(sk)	((sk)->family == PF_INET6 && __ipv6_only_sock(sk))
+#define ipv6_only_sock(sk)	((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 #else
 #define __ipv6_only_sock(sk)	0
 #define ipv6_only_sock(sk)	0