[PATCH v2 0/5] Add support for memmap on memory feature on ppc64

[Aneesh Kumar K.V]

This patch series update memmap on memory feature to fall back to
memmap allocation outside the memory block if the alignment rules are
not met. This makes the feature more useful on architectures like
ppc64 where alignment rules are different with 64K page size.

This patch series is dependent on dax vmemmap optimization series
posted here https://lore.kernel.org/linux-mm/20230616110826.344417-1-aneesh.kumar@linux.ibm.com

Changes from v1:
* update the memblock to store vmemmap_altmap details. This is required
so that when we remove the memory we can find the altmap details which
is needed on some architectures.
* rebase to latest linus tree



Aneesh Kumar K.V (5):
  mm/hotplug: Embed vmem_altmap details in memory block
  mm/hotplug: Allow architecture override for memmap on memory feature
  mm/hotplug: Simplify the handling of MHP_MEMMAP_ON_MEMORY flag
  mm/hotplug: Simplify ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE kconfig
  powerpc/book3s64/memhotplug: Enable memmap on memory for radix

 arch/arm64/Kconfig                            |  4 +-
 arch/arm64/mm/mmu.c                           |  5 +
 arch/powerpc/Kconfig                          |  1 +
 arch/powerpc/mm/book3s64/radix_pgtable.c      | 28 ++++++
 .../platforms/pseries/hotplug-memory.c        |  4 +-
 arch/x86/Kconfig                              |  4 +-
 arch/x86/mm/init_64.c                         |  6 ++
 drivers/acpi/acpi_memhotplug.c                |  3 +-
 drivers/base/memory.c                         | 28 ++++--
 include/linux/memory.h                        | 25 +++--
 include/linux/memory_hotplug.h                | 17 +++-
 include/linux/memremap.h                      | 18 +---
 mm/Kconfig                                    |  3 +
 mm/memory_hotplug.c                           | 94 +++++++++----------
 14 files changed, 151 insertions(+), 89 deletions(-)

-- 
2.41.0