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Subject[PATCH V3 0/3] arm64: Enable vmemmap mapping from device memory
This series enables vmemmap backing memory allocation from device memory
ranges on arm64. But before that, it enables vmemmap_populate_basepages()
and vmemmap_alloc_block_buf() to accommodate struct vmem_altmap based
alocation requests.

This series applies after latest (v14) arm64 memory hot remove series
( on Linux 5.6.

Pending Question:

altmap_alloc_block_buf() does not have any other remaining users in the
tree after this change. Should it be converted into a static function and
it's declaration be dropped from the header (include/linux/mm.h). Avoided
doing so because I was not sure if there are any off-tree users or not.

Changes in V3:

- Dropped comment from free_hotplug_page_range() per Robin
- Modified comment in unmap_hotplug_range() per Robin
- Enabled altmap support in vmemmap_alloc_block_buf() per Robin

Changes in V2: (

- Rebased on latest hot-remove series (v14) adding P4D page table support

Changes in V1: (

- Added an WARN_ON() in unmap_hotplug_range() when altmap is
provided without the page table backing memory being freed

Changes in RFC V2: (

- Changed the commit message on 1/2 patch per Will
- Changed the commit message on 2/2 patch as well
- Rebased on arm64 memory hot remove series (v10)

RFC V1: (

Cc: Catalin Marinas <>
Cc: Will Deacon <>
Cc: Mark Rutland <>
Cc: Paul Walmsley <>
Cc: Palmer Dabbelt <>
Cc: Tony Luck <>
Cc: Fenghua Yu <>
Cc: Dave Hansen <>
Cc: Andy Lutomirski <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Cc: Ingo Molnar <>
Cc: David Hildenbrand <>
Cc: Mike Rapoport <>
Cc: Michal Hocko <>
Cc: "Matthew Wilcox (Oracle)" <>
Cc: "Kirill A. Shutemov" <>
Cc: Andrew Morton <>
Cc: Dan Williams <>
Cc: Pavel Tatashin <>
Cc: Benjamin Herrenschmidt <>
Cc: Paul Mackerras <>
Cc: Michael Ellerman <>

Anshuman Khandual (3):
mm/sparsemem: Enable vmem_altmap support in vmemmap_populate_basepages()
mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block_buf()
arm64/mm: Enable vmem_altmap support for vmemmap mappings

arch/arm64/mm/mmu.c | 59 ++++++++++++++++++++++++++-------------
arch/ia64/mm/discontig.c | 2 +-
arch/powerpc/mm/init_64.c | 10 +++----
arch/riscv/mm/init.c | 2 +-
arch/x86/mm/init_64.c | 12 ++++----
include/linux/mm.h | 8 ++++--
mm/sparse-vmemmap.c | 38 ++++++++++++++++++++-----
7 files changed, 87 insertions(+), 44 deletions(-)


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