netfilter: reduce hook array sizes to what is needed

This series further reduces size of the hook arrays by only resevering space for the hooks that are implemented/supported (e.g., arp only supports 3 different hook points as it lacks PRE/POST_ROUTING).

Furthermore, add #ifdef guard to not declare arp/bridge/decnet hooks unless they are needed.

At least Fedora has CONFIG_DECNET=n so this even reduces size for some distro kernels.

I ran a few randconfig builds last night and it did not catch any build errors.

Florian Westphal (3):
netfilter: reduce hook array sizes to what is needed
netfilter: don't allocate space for decnet hooks unless needed
netfilter: don't allocate space for arp/bridge hooks unless needed

 include/linux/netfilter.h     |    6 ++++++
 include/net/netns/netfilter.h |   19 ++++++++++++++-----
 net/Kconfig                   |    1 +
 net/bridge/netfilter/Kconfig  |    2 ++
 net/ipv4/netfilter/Kconfig    |    2 ++
 net/netfilter/Kconfig         |    6 ++++++
 net/netfilter/core.c          |   22 ++++++++++++++++++++++
 net/netfilter/nf_queue.c      |    2 ++
 8 files changed, 55 insertions(+), 5 deletions(-)