Allow for memory hot-add

modulename: hotplug-memory.ko

and/or

memory_hotplug.ko

configname: CONFIG_MEMORY_HOTPLUG

Linux Kernel Configuration
└─>Memory Management options
└─>Allow for memory hot-add
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/powerpc/platforms/pseries/hotplug-memory.c