Kconfig

choice
	prompt "Memory model"
	default FLATMEM
	default SPARSEMEM if ARCH_SPARSEMEM_DEFAULT
	default DISCONTIGMEM if ARCH_DISCONTIGMEM_DEFAULT

config FLATMEM
	bool "Flat Memory"
	depends on !ARCH_DISCONTIGMEM_ENABLE || ARCH_FLATMEM_ENABLE
	help
	  This option allows you to change some of the ways that
	  Linux manages its memory internally.  Most users will
	  only have one option here: FLATMEM.  This is normal
	  and a correct option.

	  If unsure, choose this option over any other.

config DISCONTIGMEM
	bool "Discontigious Memory"
	depends on ARCH_DISCONTIGMEM_ENABLE
	help
	  If unsure, choose "Flat Memory" over this option.

endchoice