[PATCH 0/4] mm: hugetlb: fix some CMA-related issues

[Qi Zheng <qi.zheng@linux.dev>]

From: Qi Zheng <zhengqi.arch@bytedance.com>

Hi all,

This series fixes four CMA-related issues in HugeTLB reservation and
allocation:

 - Avoid ineffective CMA reservations on 32-bit x86 kernels running on
   CPUs that advertise 1 GiB page support.
 - Honor PF_MEMALLOC_PIN to avoid allocating CMA-backed folios during
   long-term pinning.
 - Skip CMA allocation when the caller disallows direct reclaim.
 - Enforce cpuset restrictions on surplus allocations, preserving memory
   policy semantics and handling concurrent cpuset changes without
   discarding folios that remain eligible.

Thanks,
Qi

Qi Zheng (4):
  x86: hugetlb: disable default CMA reservations on 32-bit kernel
  mm: hugetlb: skip CMA allocations under PF_MEMALLOC_PIN
  mm: hugetlb: skip CMA when direct reclaim is disallowed
  mm: hugetlb: respect cpuset restrictions for surplus allocations

 arch/x86/mm/hugetlbpage.c |  2 +-
 mm/hugetlb.c              | 38 +++++++++++++++++++++++++++++++-------
 mm/hugetlb_cma.c          |  5 ++++-
 3 files changed, 36 insertions(+), 9 deletions(-)


base-commit: 2637bdec0535a2044cd830eba9a79363651d9043
-- 
2.54.0