default or selected kernelversion does not have config value CONFIG_GENERIC_SIGALTSTACK.
Result is shown for kernelversion 5.17.13

CONFIG_GENERIC_SIGALTSTACK (not configurable)

configname: CONFIG_GENERIC_SIGALTSTACK

Linux Kernel Configuration
└─>GENERIC_SIGALTSTACK
In linux kernel since version 3.8 (release Date: 2013-02-18)