ppc64: use checksum_64.S from powerpc

as it is identical to checksum.S from ppc64.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

arch/powerpc/lib/Makefile

@@ -2,12 +2,15 @@
 # Makefile for ppc-specific library files..
 #
 
+ifeq ($(CONFIG_PPC_MERGE),y)
 obj-y			:= strcase.o string.o
 obj-$(CONFIG_PPC32)	+= div64.o copy_32.o checksum_32.o
 obj-$(CONFIG_PPC64)	+= copypage_64.o copyuser_64.o memcpy_64.o \
-			   usercopy_64.o sstep.o checksum_64.o mem_64.o
+			   usercopy_64.o sstep.o mem_64.o
 obj-$(CONFIG_PPC_ISERIES) += e2a.o
 ifeq ($(CONFIG_PPC64),y)
 obj-$(CONFIG_SMP)	+= locks.o
 endif
+endif
 
+obj-$(CONFIG_PPC64)	+= checksum_64.o

arch/ppc64/Makefile

@@ -88,6 +88,7 @@ core-y				+= arch/ppc64/kernel/ arch/powerpc/kernel/
 core-y				+= arch/powerpc/mm/
 core-y				+= arch/powerpc/sysdev/
 core-y				+= arch/powerpc/platforms/
+core-y				+= arch/powerpc/lib/
 core-$(CONFIG_XMON)		+= arch/ppc64/xmon/
 drivers-$(CONFIG_OPROFILE)	+= arch/powerpc/oprofile/
 

arch/ppc64/lib/Makefile

@@ -2,7 +2,7 @@
 # Makefile for ppc64-specific library files..
 #
 
-lib-y := checksum.o string.o strcase.o
+lib-y := string.o strcase.o
 lib-y += copypage.o memcpy.o copyuser.o usercopy.o
 
 # Lock primitives are defined as no-ops in include/linux/spinlock.h