bootmem rewrite v2

Hi Andrew,

to your request I broke up this big diff into more reviewable smaller
chunks.  They apply to -mmotm (modulo the conflicts I ran into, but
they seemed unrelated).

So, here is another version of my attempt to cleanly rewrite the
bootmem allocator.  More details in the respective patch changelogs.

Compile- and runtime tested on x86 32bit UMA.

	Hannes

 arch/alpha/mm/numa.c     |    2 +-
 arch/arm/plat-omap/fb.c  |    4 +-
 arch/avr32/mm/init.c     |    3 +-
 arch/ia64/mm/discontig.c |   19 +-
 arch/m32r/mm/discontig.c |    3 +-
 arch/m32r/mm/init.c      |    4 +-
 arch/mn10300/mm/init.c   |    6 +-
 arch/sh/mm/init.c        |    2 +-
 include/linux/bootmem.h  |   82 ++--
 mm/bootmem.c             |  918 +++++++++++++++++++++++++---------------------
 10 files changed, 552 insertions(+), 491 deletions(-)