CONFIG_BLK_MQ_STACKING (not configurable)

configname: CONFIG_BLK_MQ_STACKING

Linux Kernel Configuration
└─>Enable the block layer
└─>BLK_MQ_STACKING
In linux kernel since version 5.2 (release Date: 2019-07-07)  
depends
CONFIG_BLOCK

is depended by
CONFIG_BLK_DEV_DM