[5.15/6.1-stable PATCH] Copy-on-write hwpoison recovery

[Jane Chu <jane.chu@oracle.com>]

I was able to reproduce crash on 5.15.y kernel during COW, and
when the grandchild process attempts a write to a private page
inherited from the child process and the private page contains
a memory uncorrectable error. The way to reproduce is described
in Tony's patch, using his ras-tools/einj_mem_uc.
And the patch series fixed the panic issue in 5.15.y.

Followed here is the backport of Tony patch series to stable 5.15
and stable 6.1. Both backport have encountered trivial conflicts
due to missing dependencies, details are provided in each patch.

Please let me know whether the backport is acceptable.

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 | 24 ++++++++++++++++++++++++
 include/linux/mm.h      |  5 ++++-
 mm/memory.c             | 33 +++++++++++++++++++++++----------
 3 files changed, 51 insertions(+), 11 deletions(-)

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2.18.4