CONFIG_16KSTACKS is not available for the default architecture x86.
Result is shown for architecture arc
default or selected kernelversion does not have config value CONFIG_16KSTACKS.
Result is shown for kernelversion 6.0-rc7

Use 16Kb for kernel stacks instead of 8Kb

configname: CONFIG_16KSTACKS

Linux Kernel Configuration
└─> Use 16Kb for kernel stacks instead of 8Kb

If you say Y here the kernel will use a 16Kb stacksize for the
kernel stack attached to each process/thread. The default is 8K.
This increases the resident kernel footprint and will cause less
threads to run on the system and also increase the pressure
on the VM subsystem for higher order allocations.