[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: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index 8283685..5127441 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -53,3 +53,7 @@
 config NEED_MULTIPLE_NODES
 	def_bool y
 	depends on DISCONTIGMEM || NUMA
+
+config HAVE_MEMORY_PRESENT
+	def_bool y
+	depends on ARCH_HAVE_MEMORY_PRESENT