netfilter: reduce hook array sizes

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.

See individual patches for changes since v2.

Florian Westphal (5):
netfilter: add defines for arp/decnet max hooks
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
netfilter: reduce NF_MAX_HOOKS define

 include/linux/netfilter.h             |    6 +++++
 include/linux/netfilter_defs.h        |   12 ++++++++++-
 include/net/netns/netfilter.h         |   16 ++++++++++-----
 include/uapi/linux/netfilter_arp.h    |    3 ++
 include/uapi/linux/netfilter_decnet.h |    4 ++-
 net/Kconfig                           |    1 
 net/bridge/netfilter/Kconfig          |    2 +
 net/ipv4/netfilter/Kconfig            |    2 +
 net/netfilter/Kconfig                 |    6 +++++
 net/netfilter/core.c                  |   36 +++++++++++++++++++++++++++-------
 net/netfilter/nf_queue.c              |    2 +
 11 files changed, 76 insertions(+), 14 deletions(-)