CONFIG_CPU_COPY_V4WT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_COPY_V4WT (not configurable)

modulename: copypage-v4wt.ko

configname: CONFIG_CPU_COPY_V4WT

Linux Kernel Configuration
└─>CPU_COPY_V4WT
In linux kernel since version 2.6.12  
source code:
/arch/arm/mm/copypage-v4wt.c
depends
CONFIG_MMU