x86_64: simplify oprofile build

Instead of copying the i386 Makefile and handling path substitutions
just use the i386 oprofile Makefile.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86_64/Makefile

@@ -80,7 +80,7 @@ core-y					+= arch/x86_64/kernel/ \
 					   arch/x86_64/vdso/
 core-$(CONFIG_IA32_EMULATION)		+= arch/x86_64/ia32/
 drivers-$(CONFIG_PCI)			+= arch/x86_64/pci/
-drivers-$(CONFIG_OPROFILE)		+= arch/x86_64/oprofile/
+drivers-$(CONFIG_OPROFILE)		+= arch/i386/oprofile/
 
 boot := arch/x86_64/boot
 

arch/x86_64/oprofile/Makefile

-#
-# oprofile for x86-64.
-# Just reuse the one from i386. 
-#
-
-obj-$(CONFIG_OPROFILE) += oprofile.o
- 
-DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
-	oprof.o cpu_buffer.o buffer_sync.o \
-	event_buffer.o oprofile_files.o \
-	oprofilefs.o oprofile_stats.o \
-	timer_int.o )
-
-OPROFILE-y := init.o backtrace.o
-OPROFILE-$(CONFIG_X86_LOCAL_APIC) += nmi_int.o op_model_athlon.o op_model_p4.o \
-				     op_model_ppro.o
-OPROFILE-$(CONFIG_X86_IO_APIC)    += nmi_timer_int.o 
-
-oprofile-y = $(DRIVER_OBJS) $(addprefix ../../i386/oprofile/, $(OPROFILE-y))