default or selected kernelversion does not have config value CONFIG_HAVE_KPROBES_ON_FTRACE.
Result is shown for kernelversion 6.9-rc1

CONFIG_HAVE_KPROBES_ON_FTRACE (not configurable)

configname: CONFIG_HAVE_KPROBES_ON_FTRACE

Linux Kernel Configuration
└─>General architecture-dependent options
└─>HAVE_KPROBES_ON_FTRACE
In linux kernel since version 3.1 (release Date: 2011-10-24)