CONFIG_IA64_PAGE_SIZE_64KB is not available for thedefaultarchitecture x86.
Result is shown for architecture ia64
default or selected kernelversion does not have config value CONFIG_IA64_PAGE_SIZE_64KB.
Result is shown for kernelversion 6.9.9

64KB

configname: CONFIG_IA64_PAGE_SIZE_64KB

Kernel page size
└─>64KB
In linux kernel since version 2.6.12  
depends
NOT CONFIG_ITANIUM