CONFIG_PPC_BOOK3S_64 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Server processors

modulename: cpu_setup_ppc970.ko

and/or

cpu_setup_power7.ko

configname: CONFIG_PPC_BOOK3S_64

Processor Type
└─>Server processors
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
arch/powerpc/kernel/

is selected by
CONFIG_PPC_64K_PAGES