default or selected kernelversion does not have config value CONFIG_ARCH_DISCONTIGMEM_ENABLE.
Result is shown for kernelversion 6.9.5

CONFIG_ARCH_DISCONTIGMEM_ENABLE (not configurable)

configname: CONFIG_ARCH_DISCONTIGMEM_ENABLE

Linux Kernel Configuration
└─>Processor type and features
└─>ARCH_DISCONTIGMEM_ENABLE
In linux kernel since version 2.6.13 (release Date: 2005-08-28)