CONFIG_GDBSTUB_DEBUG_ENTRY is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300
default or selected kernelversion does not have config value CONFIG_GDBSTUB_DEBUG_ENTRY.
Result is shown for kernelversion 6.7-rc3

Debug GDB stub entry


Linux Kernel Configuration
└─>Kernel hacking
└─>Debug GDB stub entry
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option causes information to be displayed about entry to or exit
from the main GDB stub routine.