-obj-m := hello.o
+ifneq ($(KERNELRELEASE),)
+ obj-m := hello.o
+else
+ KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+ PWD := $(shell pwd)
+default:
+ $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+ $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+endif