mm: prepare for ksm swapping

Here's a series of six miscellaneous mm patches against 2.6.32-rc5-mm1,
intended to follow my earlier swap_info patches, or slot in just before
mmend in the mmotm series.

Apart from the sixth, they have some relevance to the KSM-page swapping
patches, following after a few days.  They clear away some mm cruft,
to let that series concentrate on ksm.c; but should stand on their own.

 include/linux/ksm.h        |    5 -
 include/linux/mm.h         |   17 +++
 include/linux/page-flags.h |    8 -
 include/linux/rmap.h       |    8 +
 mm/Kconfig                 |   14 --
 mm/internal.h              |   26 ++---
 mm/memory-failure.c        |    2 
 mm/memory.c                |    4 
 mm/migrate.c               |   11 --
 mm/mlock.c                 |    2 
 mm/page_alloc.c            |    4 
 mm/rmap.c                  |  174 +++++++++++------------------------
 mm/swapfile.c              |    2 
 13 files changed, 110 insertions(+), 167 deletions(-)

Hugh
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