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

Export kernel pagetable layout to userspace via debugfs

configname: CONFIG_PPC_PTDUMP

Linux Kernel Configuration
└─>Export kernel pagetable layout to userspace via debugfs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option exports the state of the kernel pagetables to a
debugfs file. This is only useful for kernel developers who are
working in architecture specific areas of the kernel - probably
not a good idea to enable this feature in a production kernel.

If you are unsure, say N.