[mm-unstable PATCH v5 0/8] mm, hwpoison: enable 1GB hugepage support (v5)

[Naoya Horiguchi <naoya.horiguchi@linux.dev>]

Here is v5 of "enabling memory error handling on 1GB hugepage" patchset.

I applied feedbacks provided for v4, thank you very much.

Change overview (see changelog in individual patches for details):

- rebased onto mm-everything-2022-07-08-01-43.
- removed the patch "mm/hugetlb: separate path for hwpoison entry in
  copy_hugetlb_page_range()" because it's separately handled and already
  in mm-hotfixes.

- v1: https://lore.kernel.org/linux-mm/20220602050631.771414-1-naoya.horiguchi@linux.dev/T/#u
- v2: https://lore.kernel.org/linux-mm/20220623235153.2623702-1-naoya.horiguchi@linux.dev/T/#u
- v3: https://lore.kernel.org/linux-mm/20220630022755.3362349-1-naoya.horiguchi@linux.dev/T/#u
- v4: https://lore.kernel.org/linux-mm/20220704013312.2415700-1-naoya.horiguchi@linux.dev/T/#u

Thanks,
Naoya Horiguchi
---
Summary:

Naoya Horiguchi (8):
      mm/hugetlb: check gigantic_page_runtime_supported() in return_unused_surplus_pages()
      mm/hugetlb: make pud_huge() and follow_huge_pud() aware of non-present pud entry
      mm, hwpoison, hugetlb: support saving mechanism of raw error pages
      mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage
      mm, hwpoison: set PG_hwpoison for busy hugetlb pages
      mm, hwpoison: make __page_handle_poison returns int
      mm, hwpoison: skip raw hwpoison page in freeing 1GB hugepage
      mm, hwpoison: enable memory error handling on 1GB hugepage

 arch/x86/mm/hugetlbpage.c |   8 ++-
 include/linux/hugetlb.h   |  18 ++++-
 include/linux/mm.h        |   2 +-
 include/linux/swapops.h   |   9 +++
 include/ras/ras_event.h   |   1 -
 mm/hugetlb.c              |  67 +++++++++++++++----
 mm/memory-failure.c       | 165 +++++++++++++++++++++++++++++++++++++---------
 7 files changed, 222 insertions(+), 48 deletions(-)