[RFC 0/2] arm64: Enable vmemmap from device memory

[Anshuman Khandual]

This series enables vmemmap mapping allocation from device memory ranges on
arm64. Before that it enables vmemmap_populate_basepages() to accommodate
struct vmem_altmap based requests.

This series is based on linux next (next-20190613) along with v6 arm64
hot-remove series [1]. 

[1] https://lkml.org/lkml/2019/6/19/3

Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-ia64@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

Anshuman Khandual (2):
  mm/sparsemem: Add vmem_altmap support in vmemmap_populate_basepages()
  arm64/mm: Enable device memory allocation and free for vmemmap mapping

 arch/arm64/mm/mmu.c      | 57 +++++++++++++++++++++++++++++++-----------------
 arch/ia64/mm/discontig.c |  2 +-
 arch/x86/mm/init_64.c    |  4 ++--
 include/linux/mm.h       |  5 +++--
 mm/sparse-vmemmap.c      | 16 +++++++++-----
 5 files changed, 54 insertions(+), 30 deletions(-)

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2.7.4