[PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE

[Anshuman Khandual]

This series enables memory hot remove on arm64, fixes a memblock removal
ordering problem in generic __remove_memory(), enables sysfs memory probe
interface on arm64. It also enables ZONE_DEVICE with struct vmem_altmap
support.

Testing:

Tested hot remove on arm64 for all 4K, 16K, 64K page config options with
all possible VA_BITS and PGTABLE_LEVELS combinations. Tested ZONE_DEVICE
with ARM64_4K_PAGES through a dummy driver.

Build tested on non arm64 platforms. I will appreciate if folks can test
arch_remove_memory() re-ordering in __remove_memory() on other platforms.

Dependency:

V5 series in the thread (https://lkml.org/lkml/2019/2/14/1096) will make
kernel linear mapping loose pgtable_page_ctor() init. When this happens
the proposed functions free_pte|pmd|pud_table() in [PATCH 2/6] will have
to stop calling pgtable_page_dtor().

Anshuman Khandual (5):
  arm64/mm: Enable sysfs based memory hot add interface
  arm64/mm: Enable memory hot remove
  arm64/mm: Enable struct page allocation from device memory
  mm/hotplug: Reorder arch_remove_memory() call in __remove_memory()
  arm64/mm: Enable ZONE_DEVICE

Robin Murphy (1):
  mm/memremap: Rename and consolidate SECTION_SIZE

 arch/arm64/Kconfig               |  13 +++
 arch/arm64/include/asm/pgtable.h |  14 +++
 arch/arm64/mm/mmu.c              | 242 ++++++++++++++++++++++++++++++++++++++-
 include/linux/mmzone.h           |   1 +
 kernel/memremap.c                |  10 +-
 mm/hmm.c                         |   2 -
 mm/memory_hotplug.c              |   3 +-
 7 files changed, 271 insertions(+), 14 deletions(-)

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2.7.4