CONFIG_HAVE_FUNCTION_TRACER (not configurable)
configname: CONFIG_HAVE_FUNCTION_TRACER
Linux Kernel Configuration
└─>HAVE_FUNCTION_TRACER
In linux kernel since version 2.6.28 (release Date: 2008-12-24)
See <a href="https://www.kernel.org/doc/Documentation/trace/ftrace-design.txt
">Documentation/trace/ftrace-design.txt
</a>
">Documentation/trace/ftrace-design.txt
</a>