badpage: more resilient bad page pte and rmap

Here's a batch of 8 mm patches, intended for 2.6.29: revisiting
bad_page() and print_bad_pte() and the page_remove_rmap() Eeek BUG.
Diffed to slot in to the mmotm series just before "mmend".

The only clash with later mmotm patches is with Manfred's
mm-debug-dump-pageframes-on-bad_page.patch
which puts a hexdump in there.  Trivial to fix up, but I've never
actually found that patch helpful - perhaps because it isn't an -mm
tree that "Bad page state" reporters are running.  Time to drop it?

 include/linux/page-flags.h |   25 ++------
 include/linux/rmap.h       |    2 
 include/linux/swap.h       |   12 ---
 mm/filemap_xip.c           |    2 
 mm/fremap.c                |    2 
 mm/internal.h              |    1 
 mm/memory.c                |  109 ++++++++++++++++++++++++++---------
 mm/page_alloc.c            |  108 +++++++++++++++++++---------------
 mm/rmap.c                  |   24 -------
 mm/swapfile.c              |    7 +-
 10 files changed, 166 insertions(+), 126 deletions(-)

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