x86_64: prepare shared mm/extable.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86_64/mm/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux x86_64-specific parts of the memory manager.
 #
 
-obj-y	 := init_64.o fault.o ioremap_64.o extable.o pageattr.o mmap_64.o
+obj-y	 := init_64.o fault.o ioremap_64.o extable_64.o pageattr.o mmap_64.o
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_NUMA) += numa_64.o
 obj-$(CONFIG_K8_NUMA) += k8topology.o