I found two types of Makefiles in some tutorials. One was like this:- obj-m := hello-1.o Other was like this:- obj-m += hello-1.o Both generated .ko files properly and I could insmod and rmmod the ko successfully. Please explain what is the difference between := and += ? -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ