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

CONFIG_CPU_MOHAWK (not configurable)

modulename: proc-mohawk.ko

and/or

xscale-cp0.ko

configname: CONFIG_CPU_MOHAWK

Linux Kernel Configuration
└─>CPU_MOHAWK
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
source code:
/arch/arm/mm/

is selected by
CONFIG_MACH_BROWNSTONE