The patchset addresses several issues related to unaccepted memory.

It replaces "mm: fix endless reclaim on machines with unaccepted
memory" commit which is in mm-unstable now.

The most severe issue is a kswapd hang, which is fixed by patch 1/8.

Pach 2/8 preparatory cleanup.

Patch 3/8 ensures that __alloc_pages_bulk() will not exhaust all
accepted memory without accepting more.

Patches 4/8-6/8 are preparations for patch 7/8, which fixes
alloc_config_page() on machines with unaccepted memory. This allows, for
example, the allocation of gigantic pages at runtime.

Patch 8/8 enable the kernel to accept memory up to the promo watermark.

I believe only the first patch deserves backporting.

Please review. Any feedback is welcome.

Kirill A. Shutemov (8):
  mm: Fix endless reclaim on machines with unaccepted memory
  mm: Reduce deferred struct page init ifdeffery
  mm: Accept memory in __alloc_pages_bulk().
  mm: Introduce PageUnaccepted() page type
  mm: Rework accept memory helpers
  mm: Add a helper to accept page
  mm: page_isolation: Handle unaccepted memory isolation
  mm: Accept to promo watermark

 arch/x86/boot/compressed/misc.c               |   2 +-
 arch/x86/boot/compressed/misc.h               |   2 +-
 drivers/firmware/efi/libstub/efistub.h        |   2 +-
 .../firmware/efi/libstub/unaccepted_memory.c  |   3 +-
 drivers/firmware/efi/unaccepted_memory.c      |  18 +--
 include/linux/mm.h                            |  12 +-
 include/linux/page-flags.h                    |   8 ++
 mm/internal.h                                 |   8 ++
 mm/memblock.c                                 |   2 +-
 mm/mm_init.c                                  |   2 +-
 mm/page_alloc.c                               | 128 ++++++++++--------
 mm/page_isolation.c                           |   8 ++
 tools/testing/memblock/internal.h             |   2 +-
 13 files changed, 122 insertions(+), 75 deletions(-)

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2.43.0