CONFIG_NUMA is not available for thedefaultarchitecture x86.
Result is shown for architecture m32r

Numa Memory Allocation Support

modulename: node.ko

and/or

mempolicy.ko

and/or

numa.ko

and/or

discontig.ko

and/or

k8-bus.ko

configname: CONFIG_NUMA

Linux/M32R Kernel Configuration
└─>Processor type and features
└─>Numa Memory Allocation Support
In linux kernel since version 2.6.12  
source code:
drivers/base//node.c
depends
CONFIG_BROKEN
CONFIG_SMP