[PATCH 00/12] mempolicy: cleanups leading to NUMA mpol without vma

[Hugh Dickins]

Here is a series of patches based on v6.6-rc3: mostly cleanups in
mm/mempolicy.c, but finally removing the pseudo-vma from shmem folio
allocation, and removing the mmap_lock around folio migration for
mbind and migrate_pages syscalls.

Applies cleanly to any v6.6-rc so far, but not quite to mm-unstable or
linux-next: a couple of rejects in mm/mempolicy.c (clashing with the
vma_start_write() in do_mbind() and the foliation in mpol_misplaced())
and in mm/swap_state.c (clashing with zswap mods).  Adjustments will
also be needed if hugetlb page->index changes to PAGE_SIZE: interleave
has to co-operate with that.  After some review, a v2 will probably be
issued, based then on mm-unstable.

01/12 hugetlbfs: drop shared NUMA mempolicy pretence
02/12 kernfs: drop shared NUMA mempolicy hooks
03/12 mempolicy: fix migrate_pages(2) syscall return
04/12 mempolicy trivia: delete those ancient pr_debug()s
05/12 mempolicy trivia: slightly more consistent naming
06/12 mempolicy trivia: use pgoff_t in shared mempolicy tree
07/12 mempolicy: mpol_shared_policy_init() without pseudo-vma
08/12 mempolicy: remove confusing MPOL_MF_LAZY dead code
09/12 mm: add page_rmappable_folio() wrapper
10/12 mempolicy: alloc_pages_mpol() for NUMA policy without vma
11/12 mempolicy: mmap_lock is not needed while migrating folios
12/12 mempolicy: migration attempt to match interleave nodes

 fs/hugetlbfs/inode.c           |  41 +-
 fs/kernfs/file.c               |  49 --
 fs/proc/task_mmu.c             |   5 +-
 include/linux/gfp.h            |  10 +-
 include/linux/huge_mm.h        |  13 +
 include/linux/hugetlb.h        |  11 -
 include/linux/mempolicy.h      |  36 +-
 include/linux/mm.h             |   2 +-
 include/uapi/linux/mempolicy.h |   2 +-
 ipc/shm.c                      |  21 +-
 mm/hugetlb.c                   |  38 +-
 mm/mempolicy.c                 | 952 ++++++++++++++++-------------------
 mm/page_alloc.c                |   8 +-
 mm/shmem.c                     | 102 ++--
 mm/swap.h                      |   9 +-
 mm/swap_state.c                |  86 ++--
 16 files changed, 617 insertions(+), 768 deletions(-)

Hugh