CONFIG_HAVE_ARCH_NODEDATA_EXTENSION is not available for thedefaultarchitecture x86.
Result is shown for architecture ia64

CONFIG_HAVE_ARCH_NODEDATA_EXTENSION (not configurable)

configname: CONFIG_HAVE_ARCH_NODEDATA_EXTENSION

IA-64 Linux Kernel Configuration
└─>Processor type and features
└─>HAVE_ARCH_NODEDATA_EXTENSION
In linux kernel since version 2.6.18 (release Date: 2006-09-19)  
depends
CONFIG_NUMA