CONFIG_PPC_256K_PAGES is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

256k page size

configname: CONFIG_PPC_256K_PAGES

Page size
└─>256k page size
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Make the page size 256k.

As the ELF standard only requires alignment to support page
sizes up to 64k, you will need to compile all of your user
space applications with a non-standard binutils settings
(see the STDBINUTILS description for details).

Say N unless you know what you are doing.

depends
NOT CONFIG_STDBINUTILS

is selected by
CONFIG_BTRFS_FS