CONFIG_CPU_SH2 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

SH-2

modulename: cache-sh2.ko

configname: CONFIG_CPU_SH2

Processor family
└─>SH-2
In linux kernel since version 2.6.12  
source code:
arch/sh/mm/cache-sh2.c
selects
CONFIG_SH_WRITETHROUGH
CONFIG_SH_INTC

is selected by
CONFIG_CPU_SUBTYPE_SH7604

is depended by
CONFIG_CPU_SUBTYPE_SH7604