CONFIG_CPU_SH3 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

CONFIG_CPU_SH3 (not configurable)

modulename: tlb-sh3.ko

and/or

cache-sh3.ko

configname: CONFIG_CPU_SH3

Linux Kernel Configuration
└─>Processor selection
└─>CPU_SH3
In linux kernel since version 2.6.12  
source code:
arch/sh/mm/cache-sh3.c

is selected by
CONFIG_SH_WDT