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

CONFIG_CPU_FEROCEON (not configurable)

modulename: proc-feroceon.ko

configname: CONFIG_CPU_FEROCEON

Linux Kernel Configuration
└─>CPU_FEROCEON
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
source code:
/arch/arm/mm/