arch/x86/kernel/acpi/Makefile - linux - Git at Google

 obj-$(CONFIG_ACPI)		+= boot.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup_$(BITS).o
 obj-$(CONFIG_ACPI_APEI)		+= apei.o

 ifneq ($(CONFIG_ACPI_PROCESSOR),)
 obj-y				+= cstate.o
 endif
	obj-$(CONFIG_ACPI) += boot.o
	obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o
	obj-$(CONFIG_ACPI_APEI) += apei.o

	ifneq ($(CONFIG_ACPI_PROCESSOR),)
	obj-y += cstate.o
	endif