How to put a check in the code to ensure the inter kernel module dependency - Linux Kernel?

Question

I have two modules. I want the modules to be interdependent while doing insmod or rmmod. Currently, my module2 is dependent on module1. If I insert module1 then module2, it

Answer 1

You can use request_module API in module mod2 in which you want to use exported symbol, this loads required module on demand if not loaded previously.

In module mod2,

static int __init module_two_init_module(void)
{
        int ret;
        const char *name;
        struct module * fmodule;
        pr_info("Module two started");
        name = "module_one";
        /* This will find module is loaded or not */
        fmodule = find_module(name); 
        if (fmodule == NULL) {
                ret = request_module(name);
                if (ret == 0) {
                        pr_info("Module one loaded");
                }
        }
        /* Do rest of code here */

Don't forget to increment module reference count using try_module_get()