CONFIG_PPC_HAS_HASH_64K is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC_HAS_HASH_64K (not configurable)

configname: CONFIG_PPC_HAS_HASH_64K

Linux Kernel Configuration
└─>Kernel options
└─>PPC_HAS_HASH_64K
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
depends
CONFIG_PPC64

is depended by
CONFIG_PPC_64K_PAGES