Error message not relevant

[Nav Kamal <navkamal90@xxxxxxxxx>]

Am learning to write LKMs and wrote this program :

#include<linux/init.h>
#include<linux/module.h>
static int module_entry(void){
        printk(KERN_ALERT "Hello World !!\n");
        return 0;
}
static void exit_module(void){
        printk(KERN_ALERT "Bye World .... \n");
}
module_init(module_entry);
module_exit(exit_module);

In this program if I change return value of function module_entry from 0 to something negative, the module fails to load. The error message is :

"insmod: ERROR: could not insert module test.ko: Operation not permitted"

Failing to load module with negative return value is understandable but I can't understand why it says "Operation not permitted". Its not about user permissions, its about return value. Can somebody please guide me about this ?

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