Rafael J. Wysocki wrote:
quoted text
> Generally, we might not be able to handle memory unplugged at a wrong time
> (eg. after we've created the image).
>   

Hot memory unplugging is distinct from memory hotplug.

quoted text
> Which part of Kconfig says that exactly?
>   

mm/Kconfig:

config MEMORY_HOTPLUG
	bool "Allow for memory hot-add"
	depends on SPARSEMEM || X86_64_ACPI_NUMA
	depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
	depends on (IA64 || X86 || PPC64 || SUPERH)

comment "Memory hotplug is currently incompatible with Software Suspend"
	depends on SPARSEMEM && HOTPLUG && HIBERNATION


    J
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