[PATCH v2 00/16] Add support for DAX vmemmap optimization for ppc64

[Aneesh Kumar K.V]

This patch series implements changes required to support DAX vmemmap
optimization for ppc64. The vmemmap optimization is only enabled with radix MMU
translation and 1GB PUD mapping with 64K page size. The patch series also split
hugetlb vmemmap optimization as a separate Kconfig variable so that
architectures can enable DAX vmemmap optimization without enabling hugetlb
vmemmap optimization. This should enable architectures like arm64 to enable DAX
vmemmap optimization while they can't enable hugetlb vmemmap optimization. More
details of the same are in patch "mm/vmemmap optimization: Split hugetlb and
devdax vmemmap optimization"

Changes from V1:
* Fix make htmldocs warning
* Fix vmemmap allocation bugs with different alignment values.
* Correctly check for section validity to before we free vmemmap area

Aneesh Kumar K.V (16):
  powerpc/mm/book3s64: Use pmdp_ptep helper instead of typecasting.
  powerpc/book3s64/mm: mmu_vmemmap_psize is used by radix
  powerpc/book3s64/mm: Fix DirectMap stats in /proc/meminfo
  powerpc/book3s64/mm: Use PAGE_KERNEL instead of opencoding
  powerpc/mm/dax: Fix the condition when checking if altmap vmemap can
    cross-boundary
  mm/hugepage pud: Allow arch-specific helper function to check huge
    page pud support
  mm: Change pudp_huge_get_and_clear_full take vm_area_struct as arg
  mm/vmemmap: Improve vmemmap_can_optimize and allow architectures to
    override
  mm/vmemmap: Allow architectures to override how vmemmap optimization
    works
  mm: Add __HAVE_ARCH_PUD_SAME similar to __HAVE_ARCH_P4D_SAME
  mm/huge pud: Use transparent huge pud helpers only with
    CONFIG_TRANSPARENT_HUGEPAGE
  mm/vmemmap optimization: Split hugetlb and devdax vmemmap optimization
  powerpc/book3s64/mm: Enable transparent pud hugepage
  powerpc/book3s64/vmemmap: Switch radix to use a different vmemmap
    handling function
  powerpc/book3s64/radix: Add support for vmemmap optimization for radix
  powerpc/book3s64/radix: Remove mmu_vmemmap_psize

 Documentation/mm/vmemmap_dedup.rst            |   1 +
 Documentation/powerpc/index.rst               |   1 +
 Documentation/powerpc/vmemmap_dedup.rst       | 101 +++
 arch/loongarch/Kconfig                        |   2 +-
 arch/powerpc/Kconfig                          |   1 +
 arch/powerpc/include/asm/book3s/64/pgtable.h  | 156 ++++-
 arch/powerpc/include/asm/book3s/64/radix.h    |  47 ++
 .../include/asm/book3s/64/tlbflush-radix.h    |   2 +
 arch/powerpc/include/asm/book3s/64/tlbflush.h |   8 +
 arch/powerpc/include/asm/pgtable.h            |   3 +
 arch/powerpc/mm/book3s64/pgtable.c            |  78 +++
 arch/powerpc/mm/book3s64/radix_pgtable.c      | 577 ++++++++++++++++--
 arch/powerpc/mm/book3s64/radix_tlb.c          |   7 +
 arch/powerpc/mm/init_64.c                     |  39 +-
 arch/powerpc/platforms/Kconfig.cputype        |   1 +
 arch/riscv/Kconfig                            |   2 +-
 arch/x86/Kconfig                              |   3 +-
 drivers/nvdimm/pfn_devs.c                     |   2 +-
 fs/Kconfig                                    |   2 +-
 include/linux/mm.h                            |  32 +-
 include/linux/pgtable.h                       |  11 +-
 include/trace/events/thp.h                    |  17 +
 mm/Kconfig                                    |   5 +-
 mm/debug_vm_pgtable.c                         |   2 +-
 mm/huge_memory.c                              |   2 +-
 mm/mm_init.c                                  |   2 +-
 mm/mremap.c                                   |   2 +-
 mm/sparse-vmemmap.c                           |   3 +
 28 files changed, 1032 insertions(+), 77 deletions(-)
 create mode 100644 Documentation/powerpc/vmemmap_dedup.rst

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2.40.1