[PATCH v6 0/1] mm/memory-failure: don't allow to unpoison hw corrupted page

[zhenwei pi <pizhenwei@bytedance.com>]

v5 -> v6:
- Suggested by Naoya, declare 'hw_memory_failure' with initial value
  explicitly, also add __read_mostly. Thanks to Naoya&David!
  Leave 'Cc stable' or not to Andrew to decide.

v4 -> v5:
- Add mf_flags 'MF_SW_SIMULATED' to distinguish SW/HW memory failure,
  and use a global variable to record HW memory failure, once HW
  memory failure happens, disable unpoison.

v3 -> v4:
- Add debug entry "hwpoisoned-pages" to show the number of hwpoisoned
  pages.
- Disable unpoison when a read HW memory failure occurs.

v2 -> v3:
- David pointed out that virt_to_kpte() is broken(no pmd_large() test
  on a PMD), so drop this API in this patch, walk kmap instead.

v1 -> v2:
- this change gets protected by mf_mutex
- use -EOPNOTSUPP instead of -EPERM 

v1:
- check KPTE to avoid to unpoison hardware corrupted page

zhenwei pi (1):
  mm/memory-failure: disable unpoison once hw error happens

 Documentation/vm/hwpoison.rst |  3 ++-
 drivers/base/memory.c         |  2 +-
 include/linux/mm.h            |  1 +
 mm/hwpoison-inject.c          |  2 +-
 mm/madvise.c                  |  2 +-
 mm/memory-failure.c           | 12 ++++++++++++
 6 files changed, 18 insertions(+), 4 deletions(-)

-- 
2.20.1