CONFIG_FTRACE_MCOUNT_USE_OBJTOOL (not configurable)

configname: CONFIG_FTRACE_MCOUNT_USE_OBJTOOL

Linux Kernel Configuration
└─>Kernel hacking
└─>Tracers
└─>FTRACE_MCOUNT_USE_OBJTOOL
In linux kernel since version 5.2 (release Date: 2019-07-07)  
selects
CONFIG_OBJTOOL