mm: hugetlb: allocate frozen gigantic folio

Introduce alloc_contig_frozen_pages() and cma_alloc_frozen_compound()
which avoid atomic operation about page refcount, and then convert to
allocate frozen gigantic folio by the new helpers in hugetlb to cleanup
the alloc_gigantic_folio().

v3:
- Fix built warn/err, found by lkp test
- Address some David's comments,
  - Force on frozen part and drop the optimization part
  - Rename split_non_compound_pages() to __split_pages()
  - Adding back debug print/WARN_ON if no cma range found or the
    pfn range of page is not full match the cma range.

v2:
- Optimize gigantic folio allocation speed
- Using HPAGE_PUD_ORDER in debug_vm_pgtable
- Address some David's comments,
  - kill folio_alloc_gigantic()
  - add generic cma_alloc_frozen{_compound}() instead of
    cma_{alloc,free}_folio

Kefeng Wang (6):
  mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page()
  mm: page_alloc: add __split_page()
  mm: page_alloc: add alloc_contig_{range_frozen,frozen_pages}()
  mm: cma: add __cma_release()
  mm: cma: add cma_alloc_frozen{_compound}()
  mm: hugetlb: allocate frozen pages in alloc_gigantic_folio()

 include/linux/cma.h   |  26 ++----
 include/linux/gfp.h   |  52 +++++------
 mm/cma.c              | 109 +++++++++++-----------
 mm/debug_vm_pgtable.c |  38 ++++----
 mm/hugetlb.c          |  58 +++---------
 mm/hugetlb_cma.c      |  27 +++---
 mm/hugetlb_cma.h      |  10 +--
 mm/internal.h         |   6 ++
 mm/page_alloc.c       | 204 ++++++++++++++++++++++++++++--------------
 9 files changed, 271 insertions(+), 259 deletions(-)

-- 
2.27.0