# To build modules outside of the kernel tree, we run "make"
# in the kernel source tree; the Makefile these then includes this
# Makefile once again.
# This conditional selects whether we are being included from the
# kernel Makefile or not.
 ifeq ($(KERNELRELEASE),)

 # Assume the source tree is where the running kernel was built
 # You should set KERNELDIR in the environment if it's elsewhere
 KERNELDIR ?= /lib/modules/$(shell uname -r)/build
 # The current directory is passed to sub-makes as argument
 PWD := $(shell pwd)
 modules:

$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
 modules_install:

$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install

 clean:

rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions

 .PHONY: modules modules_install clean

 else
# called from kernel build system: just declare what our modules are
obj-m := test.o
endif