default or selected kernelversion does not have config value CONFIG_HAVE_FENTRY.
Result is shown for kernelversion 6.9-rc4
CONFIG_HAVE_FENTRY (not configurable)
configname: CONFIG_HAVE_FENTRY
Linux Kernel Configuration
└─>Kernel hacking
└─>HAVE_FENTRY
In linux kernel since version 3.1 (release Date: 2011-10-24)
Arch supports the gcc options -pg with -mfentry