Hello,fedora-list Source: #define MODULE #include <linux/module.h> int init_module(void) {printk("<1>Hello,world\n");return 0;} void cleanup_module(void) {printk("<1>Goodbye cruel world\n");} It is the first demo of book "The linux device driver". then, gcc -c hello.c insmod ./hello.o then an error occured: insmod error inserting "hello.o": -l Invalid module fromat why? Thank you! littertiger tiger_zsch@xxxxxxx 2004-06-19