CONFIG_OF_RESERVED_MEM (not configurable)

modulename: of_reserved_mem.ko

configname: CONFIG_OF_RESERVED_MEM

Linux Kernel Configuration
└─>Device Drivers
└─>Device Tree and Open Firmware support
└─>OF_RESERVED_MEM
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Initialization code for DMA reserved memory

source code:
drivers/of/of_reserved_mem.c
depends
CONFIG_OF
CONFIG_OF_FLATTREE
CONFIG_DMA_CMA or CONFIG_HAVE_GENERIC_DMA_COHERENT
CONFIG_HAVE_MEMBLOCK