Allow for memory hot-add

modulename: memory.ko

and/or

memory_hotplug.ko

configname: CONFIG_MEMORY_HOTPLUG

Linux Kernel Configuration
└─>Allow for memory hot-add
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
drivers/base//memory.c
depends
CONFIG_HOTPLUG
CONFIG_SPARSEMEM
NOT CONFIG_SOFTWARE_SUSPEND

is selected by
CONFIG_MEMORY_HOTREMOVE