CONFIG_CPU_PJ4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_PJ4 (not configurable)

modulename: pj4-cp0.ko

configname: CONFIG_CPU_PJ4

Linux Kernel Configuration
└─>CPU_PJ4
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
arch/arm/kernel/pj4-cp0.c