hwpoison fixes and stress testing filters

Hi,

I'd like to submit the following patches for review. They mainly falls into two catalogs:

- hwpoison fixes and cleanups we collected over time

[PATCH 01/24] page-types: add standard GPL license head [PATCH 02/24] migrate: page could be locked by hwpoison, dont BUG() [PATCH 03/24] HWPOISON: remove the anonymous entry [PATCH 04/24] HWPOISON: return ENXIO on invalid pfn [PATCH 05/24] HWPOISON: avoid grabbing page for two times [PATCH 06/24] HWPOISON: abort on failed unmap
[PATCH 07/24] HWPOISON: comment the possible set_page_dirty() race [PATCH 08/24] HWPOISON: comment dirty swapcache pages [PATCH 09/24] HWPOISON: introduce delete_from_lru_cache() [PATCH 10/24] HWPOISON: remove the free buddy page handler [PATCH 11/24] HWPOISON: detect free buddy pages explicitly

- conditional hwpoison injection filters for stress testing

[PATCH 12/24] HWPOISON: make it possible to unpoison pages
[PATCH 13/24] HWPOISON: introduce struct hwpoison_control
[PATCH 14/24] HWPOISON: return 0 if page is assured to be isolated [PATCH 15/24] HWPOISON: add fs/device filters
[PATCH 16/24] HWPOISON: limit hwpoison injector to known page types [PATCH 17/24] mm: export stable page flags
[PATCH 18/24] HWPOISON: add page flags filter
[PATCH 19/24] memcg: rename and export try_get_mem_cgroup_from_page() [PATCH 20/24] memcg: add accessor to mem_cgroup.css
[PATCH 21/24] cgroup: define empty css_put() when !CONFIG_CGROUPS [PATCH 22/24] HWPOISON: add memory cgroup filter
[PATCH 23/24] HWPOISON: add an interface to switch off/on all the page filters [PATCH 24/24] HWPOISON: show corrupted file info

 Documentation/vm/page-types.c     |   15 -
 fs/proc/page.c                    |   45 ---
 include/linux/cgroup.h            |    3 
 include/linux/kernel-page-flags.h |   46 +++
 include/linux/memcontrol.h        |   13 
 include/linux/mm.h                |    1 
 include/linux/page-flags.h        |    4 
 mm/Kconfig                        |    3 
 mm/hwpoison-inject.c              |   89 +++++-
 mm/internal.h                     |   12 
 mm/madvise.c                      |    1 
 mm/memcontrol.c                   |   16 -
 mm/memory-failure.c               |  392 ++++++++++++++++++++++------
 mm/memory.c                       |    4 
 mm/migrate.c                      |    2 
 mm/page_alloc.c                   |   21 +
 16 files changed, 532 insertions(+), 135 deletions(-)

Thanks,
Fengguang