In the latest branch CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE is no longer disabled
https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/jammy/+ref/lp_2028158_device_dax_2
In the latest branch CONFIG_ MEMORY_ HOTPLUG_ DEFAULT_ ONLINE is no longer disabled
https:/ /code.launchpad .net/~mreed8855 /ubuntu/ +source/ linux/+ git/jammy/ +ref/lp_ 2028158_ device_ dax_2