Null test block driver

modulename: null_blk.ko

configname: CONFIG_BLK_DEV_NULL_BLK

Linux Kernel Configuration
└─>Device Drivers
└─>Block devices
└─>Null test block driver
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/block//

depends
CONFIG_BLK_DEV