Drivers that use kfree in destructor are easily converted
to use free_netdev.

1. Fix bad reservation in xfrm_state_check_space()
2. Macroize formula for reservation, use the macro over all the places
   in IP.

- Changed dst named metrics, to RTAX_MAX metrics array.
- Add inline shorthands to access them
- Add update_pmtu and get_mss to DST ops.
- Add path component to DST, it is DST itself by default.

- Use s6_XXX instead of in6_u.s6_XXX
- Use macros not magic numbers
- Avoid __constant_{hton,ntoh}{l,s} in runtime code.

This makes some more things in the ipv6 code static.  Some of them may
be wrong (or for futures) bu it looks pretty OK to me (and it builds).

- do not make path mtu discovery, when it is disabled :-)

  - me/Al Viro: fix bdget() oops with block device modules that don't
  clean up after they exit
  - Alan Cox: continued merging (drivers, license tags)
  - David Miller: sparc update, network fixes
  - Christoph Hellwig: work around broken drivers that add a gendisk more
  than once
  - Jakub Jelinek: handle more ELF loading special cases
  - Trond Myklebust: NFS client and lockd reclaimer cleanups/fixes
  - Greg KH: USB updates
  - Mikael Pettersson: sparate out local APIC / IO-APIC config options

  - Merge with Alan
  - Trond Myklebust: NFS fixes - kmap and root inode special case
  - Al Viro: more superblock cleanups, inode leak in rd.c, minix
  directories in page cache
  - Paul Mackerras: clean up rubbish from sl82c105.c
  - Neil Brown: md/raid cleanups, NFS filehandles
  - Johannes Erdfelt: USB update (usb-2.0 support, visor fix, Clie fix,
  pl2303 driver update)
  - David Miller: sparc and net update
  - Eric Biederman: simplify and correct bootdata allocation - don't
  overwrite ramdisks
  - Tim Waugh: support multiple SuperIO devices, parport doc updates

  - Johannes Erdfelt: OHCI hash-chain corruption fix, USB updates
  - Richard Henderson, Ivan Kokshaysky: alpha PCI iommu fixes
  - Tim Waugh: parport changelogs and printk levels
  - Andrew Morton: vmalloc off-by-one (overly sensitive) test
  - Al Viro: VFS layer cleanups
  - Cort Dougan: PPC updates (big bootloader re-org)
  - Alan Cox: more merges, remove phillips camera conversion code
  - Andrea Arkangeli: alpha fixups
  - OGAWA Hirofumi: big-sector support with FAT
  - Neil Brown: more md fixes

  - Al Viro: sanity-check user arguments, zero-terminated strings etc.
  - Urban Widmark: smbfs update (server/client cache coherency etc)
  - Rik van Riel, Marcelo Tosatti: VM updates
  - Cort Dougan: PPC updates
  - Neil Brown: raid1/5 failed drive fixups, NULL ptr checking, md error cleanup
  - Neil Brown: knfsd fix for 64-bit architectures, and filehandle resolveir
  - Ken Brownfield: workaround for menuconfig CPU selection glitch
  - David Miller: sparc64 MM setup fix, arpfilter forward port
  - Keith Owens: Remove obsolete IPv6 provider based addressing
  - Jari Ruusu: block_write error case cleanup fix
  - Jeff Garzik: netdriver update

  - Johannes Erdfelt: USB updates
  - David Howells: more rw-sem stuff
  - David Miller: network callback cleanups and fixes
  - Jan Harkes: make Coda use the proper VFS layer interfaces, so that it can use
  "non-traditional-unix" filesystems without inode numbers for backing store.

  - Mike Phillips: olympic driver update
  - Alan Cox: continued resyncing (lots of small stuff, big NTFS merge from Anton)
  - Martin Dalecki: cleanup (remove unused and unnecessary get_hardblocksize)
  - Chris Mason: fix potential reiserfs journal overflow
  - Jeff Garzik: network driver updates
  - David Miller: sparc fixes, some network cleanups

  - Hui-Fen Hsu: sis900 driver update
  - NIIBE Yutaka: Super-H update
  - Alan Cox: more resyncs (ARM down, but more to go)
  - David Miller: network zerocopy, Sparc sync, qlogic,FC fix, etc.
  - David Miller/me: get rid of various drivers hacks to do mmap
  alignment behind the back of the VM layer. Create a real
  protocol for it.