CONFIG_REPLICATE_KTEXT is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Kernel text replication support

configname: CONFIG_REPLICATE_KTEXT

Linux/MIPS Kernel Configuration
└─>Machine selection
└─>Kernel text replication support
In linux kernel since version 2.6.12  
Say Y here to enable replicating the kernel text across multiple
nodes in a NUMA cluster. This trades memory for speed.