# Comment/uncomment the following line to disable/enable debugging#DEBUG = y# Add your debugging flag (or not) to CFLAGSifeq ($(DEBUG),y)  DEBFLAGS = -O -g -DSBULL_DEBUG # "-O" is needed to expand inlineselse  DEBFLAGS = -O2endifCFLAGS += $(DEBFLAGS)CFLAGS += -I..ifneq ($(KERNELRELEASE),)# call from kernel build systemobj-m	:= snull.oelseKERNELDIR ?= /lib/modules/$(shell uname -r)/buildPWD       := $(shell pwd)default:	$(MAKE) -C $(KERNELDIR) M=$(PWD) modulesendifclean:	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versionsdepend .depend dep:	$(CC) $(CFLAGS) -M *.c > .dependifeq (.depend,$(wildcard .depend))include .dependendif