"FATAL: Module not found error" using modprobe

Question

I have a problem with modprobe command... I compiled the hello world module and loaded it with insmod, it works fine and when I do lsmod, I can see it in the output list. But when I insert this module using modprobe I am getting a FATAL error:

root@okapi:/home/ravi# modprobe ./hello.ko  FATAL: Module ./hello.ko not found. root@okapi:/home/ravi# 

Here is the module code:

#include <linux/init.h> #include <linux/module.h>  MODULE_LICENSE("Dual BSD/GPL");  static int hello_init(void) {         printk(KERN_ALERT "Hello, world\n");         return 0; } static void hello_exit(void) {         printk(KERN_ALERT "Goodbye, cruel world\n"); }  module_init(hello_init); module_exit(hello_exit); 

and Makefile

obj-m += hello.o  all:         make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules  clean:         make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 

Answer 1

The reason is that modprobe looks into /lib/modules/$(uname -r) for the modules and therefore won't work with local file path. That's one of differences between modprobe and insmod.