CONFIG_PPC_64K_PAGES is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

64k page size

configname: CONFIG_PPC_64K_PAGES

Page size
└─>64k page size
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  

is selected by
CONFIG_SPU_FS_64K_LS