default or selected kernelversion does not have config value CONFIG_HARDLOCKUP_CHECK_TIMESTAMP.
Result is shown for kernelversion 6.9-rc5

CONFIG_HARDLOCKUP_CHECK_TIMESTAMP (not configurable)

configname: CONFIG_HARDLOCKUP_CHECK_TIMESTAMP

Linux Kernel Configuration
└─>Kernel hacking
└─>Debug Oops, Lockups and Hangs
└─>HARDLOCKUP_CHECK_TIMESTAMP
In linux kernel since version 3.10 (release Date: 2013-06-30)