How to define a function in one linux kernel module and use it in another?

Question

I developed two simple modules to the kernel. Now i want to define a function in one module and after that use it in the other.

How i can do that?

Just define the function and caller in the other module without problems?

Answer 1

Define it in module1.c:

#include <linux/module.h>

int fun(void);
EXPORT_SYMBOL(fun);

int fun(void)
{
    /* ... */
}

And use it in module2.c:

extern int fun(void);