On Thu, Jul 9, 2020 at 8:17 PM Jia He [off-list ref] wrote:

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:
v4: - remove "device-dax: use fallback nid when numa_node is invalid", wait
      for Dan Williams' phys_addr_to_target_node() patch

FWIW, I put these patches through a 0-day run overnight and will be
posting them today.

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