--- a/arch/arm/mach-cns3xxx/Makefile
+++ b/arch/arm/mach-cns3xxx/Makefile
@@ -1,3 +1,6 @@
 obj-$(CONFIG_ARCH_CNS3XXX)		+= core.o pm.o devices.o
 obj-$(CONFIG_PCI)			+= pcie.o
 obj-$(CONFIG_MACH_CNS3420VB)		+= cns3420vb.o
+obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o
+obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
+obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
--- a/arch/arm/mach-cns3xxx/Kconfig
+++ b/arch/arm/mach-cns3xxx/Kconfig
@@ -3,6 +3,7 @@ menu "CNS3XXX platform type"
 
 config MACH_CNS3420VB
 	bool "Support for CNS3420 Validation Board"
+	select HAVE_ARM_SCU if SMP
 	select MIGHT_HAVE_PCI
 	help
 	  Include support for the Cavium Networks CNS3420 MPCore Platform
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -373,6 +373,7 @@ config ARCH_CNS3XXX
 	select MIGHT_HAVE_PCI
 	select PCI_DOMAINS if PCI
 	select HAVE_ARM_TWD
+	select HAVE_SMP
 	help
 	  Support for Cavium Networks CNS3XXX platform.