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

4kB

configname: CONFIG_PAGE_SIZE_4KB

Kernel page size
└─>4kB
In linux kernel since version 2.6.12  
This option select the standard 4kB Linux page size. On some
R3000-family processors this is the only available page size. Using
4kB page size will minimize memory consumption and is therefore
recommended for low memory systems.