Makefile

MODULE_NAME = lab_kernel_module
KERNEL_DIR ?= "/lib/modules/$(shell uname -r)/build"

KERNEL_SRCS = lab_km.c
USER_SRCS = user_app.c
KERNEL_OBJS = $(KERNEL_SRCS:.c=.o)

obj-m += $(MODULE_NAME).o

$(MODULE_NAME)-objs := $(KERNEL_OBJS)

CFLAGS=-std=gnu99 -Wno-declaration-after-statement
ccflags-y=-std=gnu99 -Wno-declaration-after-statement
USER_APP=user_app
LAB_CHARACTER_DEVICE=lab_character_device
LAB_MAJOR_NUMBER_DEVICE=100

all: module create_dev install
user: $(USER_SRCS)
    gcc $(USER_SRCS) -o $(USER_APP) -std=c99
module: $(KERNEL_SRCS)
    make -C $(KERNEL_DIR) M=$(PWD) modules
install: $(MODULE_NAME).ko
    sudo insmod ./$(MODULE_NAME).ko
create_dev:
    sudo mknod $(LAB_CHARACTER_DEVICE) c $(LAB_MAJOR_NUMBER_DEVICE) 0
remove:
    sudo rmmod $(MODULE_NAME)
clean:
    make -C $(KERNEL_DIR) M=$(PWD) clean
    rm -f $(USER_APP)
    rm -f $(LAB_CHARACTER_DEVICE)