CONFIG_PAGE_SIZE_4KB is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

4kB

configname: CONFIG_PAGE_SIZE_4KB

Kernel page size
└─>4kB
In linux kernel since version 2.6.12  
This is the default page size used by all SuperH CPUs.

is selected by
CONFIG_CPU_MIPS32_R5_XPA