[PATCH] generify memory present

Allow architectures to indicate that they will be providing hooks to indice
installed memory areas, memory_present().  Provide prototypes for the i386
implementation.
Signed-off-by: NAndy Whitcroft <apw@shadowen.org>
Signed-off-by: NDave Hansen <haveblue@us.ibm.com>
Signed-off-by: NMartin Bligh <mbligh@aracnet.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/i386/Kconfig

@@ -793,7 +793,7 @@ config HAVE_ARCH_BOOTMEM_NODE
 	depends on NUMA
 	default y
 
-config HAVE_MEMORY_PRESENT
+config ARCH_HAVE_MEMORY_PRESENT
 	bool
 	depends on DISCONTIGMEM
 	default y

mm/Kconfig

@@ -53,3 +53,7 @@ config FLATMEM
 config NEED_MULTIPLE_NODES
 	def_bool y
 	depends on DISCONTIGMEM || NUMA
+
+config HAVE_MEMORY_PRESENT
+	def_bool y
+	depends on ARCH_HAVE_MEMORY_PRESENT