[PATCH] Fix x86-64 build with separate object tree

From Arnd Bergmann.

arch/x86_64/kernel/cpufreq/Makefile

@@ -4,9 +4,4 @@
 
 obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o
 
-$(obj)/powernow-k8.c: $(obj)/powernow-k8.h
-	@ln -sf ../../../i386/kernel/cpu/cpufreq/powernow-k8.c $(obj)/powernow-k8.c
-$(obj)/powernow-k8.h:
-	@ln -sf ../../../i386/kernel/cpu/cpufreq/powernow-k8.h $(obj)/powernow-k8.h
-
-clean-files += powernow-k8.c powernow-k8.h
+powernow-k8-objs := ../../../i386/kernel/cpu/cpufreq/powernow-k8.o

arch/x86_64/mm/Makefile

@@ -7,7 +7,4 @@ obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_DISCONTIGMEM) += numa.o
 obj-$(CONFIG_K8_NUMA) += k8topology.o
 
-$(obj)/hugetlbpage.c: 
-	@ln -sf ../../i386/mm/hugetlbpage.c $(obj)/hugetlbpage.c
-
-clean-files += hugetlbpage.c
+hugetlbpage-y = ../../i386/mm/hugetlbpage.o