Linux-kernel

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I. Linux kernel articles

6. Create a dynamic module

It can be very useful to know how to build a dynamic module. But be very careful when you use it because a bad code could corrupt your whole system.

Instead of the standard Makefile:

obj-y := file.o

We now need to do:

KERNELDIR ?= /usr/src/linux-headers-3.13.0-39-generic
PWD := $(shell pwd)
default:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
clean:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules clean

Run the make command:

make

To test it:

insmod module.ko

And to remove the added module:

rmmod module

Once again, I repeat: be very careful !