CONFIG_DEBUG_USER_ASCE is not available for thedefaultarchitecture x86.
Result is shown for architecture s390
default or selected kernelversion does not have config value CONFIG_DEBUG_USER_ASCE.
Result is shown for kernelversion 5.13-rc2

Debug User ASCE


Linux Kernel Configuration
└─>Debug User ASCE
In linux kernel since version 5.11 (release Date: 2021-02-14)  
Check on exit to user space that address space control
elements are setup correctly.

If unsure, say N.