[PATCH v3 0/6] Fix and enable pmem as RAM device on arm64

[Jia He <justin.he@arm.com>]

This fixies a few issues when I tried to enable pmem as RAM device on arm64.

To use memory_add_physaddr_to_nid as a fallback nid, it would be better
implement a general version (__weak) in mm/memory_hotplug. After that, arm64/
sh/s390 can simply use the general version, and PowerPC/ia64/x86 will use
arch specific version.

Tested on ThunderX2 host/qemu "-M virt" guest with a nvdimm device. The 
memblocks from the dax pmem device can be either hot-added or hot-removed
on arm64 guest. Also passed the compilation test on x86.

Changes:
v3: - introduce general version memory_add_physaddr_to_nid, refine the arch
      specific one
    - fix an uninitialization bug in v2 device-dax patch
v2: https://lkml.org/lkml/2020/7/7/71
    - Drop unnecessary patch to harden try_offline_node
    - Use new solution(by David) to fix dev->target_node=-1 during probing
    - Refine the mem_hotplug_begin/done patch

v1: https://lkml.org/lkml/2020/7/5/381


Jia He (6):
  mm/memory_hotplug: introduce default dummy
    memory_add_physaddr_to_nid()
  arm64/mm: use default dummy memory_add_physaddr_to_nid()
  sh/mm: use default dummy memory_add_physaddr_to_nid()
  mm: don't export memory_add_physaddr_to_nid in arch specific directory
  device-dax: use fallback nid when numa_node is invalid
  mm/memory_hotplug: fix unpaired mem_hotplug_begin/done

 arch/arm64/mm/numa.c | 10 ----------
 arch/ia64/mm/numa.c  |  2 --
 arch/sh/mm/init.c    |  9 ---------
 arch/x86/mm/numa.c   |  1 -
 drivers/dax/kmem.c   | 21 +++++++++++++--------
 mm/memory_hotplug.c  | 15 ++++++++++++---
 6 files changed, 25 insertions(+), 33 deletions(-)

-- 
2.17.1
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