CONFIG_BFIN_ICACHE_LOCK is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BFIN_ICACHE_LOCK.
Result is shown for kernelversion 5.3.7

Enable Instruction Cache Locking

modulename: lock.ko

configname: CONFIG_BFIN_ICACHE_LOCK

Blackfin Kernel Configuration
└─>Blackfin Processor Options
└─>Enable Instruction Cache Locking
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
source code: