Unable to insert module using modprobe utility

Question

I have tried to load a hello world kernel module using modprobe utility but I am getting the error "FATAL: Module hello.ko not found error".

The module path is in /lib/modules/uname-r. I am able to build and create the .ko file and insert using insmod but can't do the same with modprobe.

Please clarify the difference between modprobe and insmod utility

Answer 1

modprobe doesn't seach files under /lib/modules/<kernel-version>, but uses modules.dep file in this directory for map module name to file, contained that module.

For update modules.dep file after adding new module, use depmod command.