[PATCH] mm/Kconfig: hide "Memory Model" selection menu

I got some feedback from users who think that the new "Memory Model" menu is a
little invasive.  This patch will hide that menu, except when
CONFIG_EXPERIMENTAL is enabled *or* when an individual architecture wants it.

An individual arch may want to enable it because they've removed their
arch-specific DISCONTIG prompt in favor of the mm/Kconfig one.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/Kconfig

+config SELECT_MEMORY_MODEL
+	def_bool y
+	depends on EXPERIMENTAL || ARCH_SELECT_MEMORY_MODEL
+
 choice
 	prompt "Memory model"
-	default DISCONTIGMEM if ARCH_DISCONTIGMEM_DEFAULT
-	default FLATMEM
+	depends on SELECT_MEMORY_MODEL
+	default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT
+	default FLATMEM_MANUAL
 
-config FLATMEM
+config FLATMEM_MANUAL
 	bool "Flat Memory"
 	depends on !ARCH_DISCONTIGMEM_ENABLE || ARCH_FLATMEM_ENABLE
 	help
@@ -14,7 +19,7 @@ config FLATMEM
 
 	  If unsure, choose this option over any other.
 
-config DISCONTIGMEM
+config DISCONTIGMEM_MANUAL
 	bool "Discontigious Memory"
 	depends on ARCH_DISCONTIGMEM_ENABLE
 	help
@@ -22,6 +27,14 @@ config DISCONTIGMEM
 
 endchoice
 
+config DISCONTIGMEM
+	def_bool y
+	depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL
+
+config FLATMEM
+	def_bool y
+	depends on !DISCONTIGMEM || FLATMEM_MANUAL
+
 #
 # Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
 # to represent different areas of memory.  This variable allows