CONFIG_HAVE_MEMBLOCK (not configurable)

modulename: memblock.ko

configname: CONFIG_HAVE_MEMBLOCK

Linux Kernel Configuration
└─>Memory Management options
└─>HAVE_MEMBLOCK
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
source code:
mm/memblock.c
is selected by
CONFIG_ION