CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC is not available for the selected architecture x86.
Result is shown for architecture riscv

CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC (not configurable)

configname: CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC

Linux Kernel Configuration
└─>ARCH_SUPPORTS_DEBUG_PAGEALLOC
In linux kernel since version 2.6.30 (release Date: 2009-06-09)