Recover from poison consumption while copying pages
in the kernel for a copy-on-write fault.

Changes since v3:

1) Miaohe Lin [off-list ref] pointed out that a recent change
by Alexander Potapenko [off-list ref] to copy_user_highpage()
added a call to kmsan_unpoison_memory().  Same is needed in my cloned
copy_mc_user_highpage() ... at least in the successful case where the
page was copied with no machine checks.

2) Picked up some additional Reviewed-by and Tested-by tags.

Tony Luck (2):
  mm, hwpoison: Try to recover from copy-on write faults
  mm, hwpoison: When copy-on-write hits poison, take page offline

 include/linux/highmem.h | 26 ++++++++++++++++++++++++++
 include/linux/mm.h      |  5 ++++-
 mm/memory.c             | 32 ++++++++++++++++++++++----------
 3 files changed, 52 insertions(+), 11 deletions(-)


base-commit: 30a0b95b1335e12efef89dd78518ed3e4a71a763
-- 
2.37.3