CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE (not configurable)

configname: CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE

Linux Kernel Configuration
└─>Memory Management options
└─>ARCH_ENABLE_MEMORY_HOTREMOVE
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
is selected by
CONFIG_MEMORY_HOTREMOVE