CONFIG_PPC_STD_MMU_64 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_PPC_STD_MMU_64.
Result is shown for kernelversion 6.7-rc3

CONFIG_PPC_STD_MMU_64 (not configurable)

modulename: pgtable-hash64.ko

and/or

hugetlbpage-hash64.ko

configname: CONFIG_PPC_STD_MMU_64

Linux Kernel Configuration
└─>Processor support
└─>PPC_STD_MMU_64
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
source code:
arch/powerpc/mm/