CONFIG_BL_SWITCHER_DUMMY_IF is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Simple big.LITTLE switcher user interface

modulename: bL_switcher_dummy_if.ko

configname: CONFIG_BL_SWITCHER_DUMMY_IF

Linux Kernel Configuration
└─>Kernel Features
└─>Simple big.LITTLE switcher user interface
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This is a simple and dummy char dev interface to control
the big.LITTLE switcher core code. It is meant for
debugging purposes only.

source code: