Hi list,
I have a simple question - I want to use some functions in my driver code, which are defined and declared in another driver. What should I do in order to achieve this? Do the external functions have to be implemented in a specific way?
I tried to add to my code something like:
extern int function_name(arg1, arg2); //exactly as it appears in original definition
and used this function a couple of times, but afther that when loading the module I get an error like:
my_driver: Unknown symbol function_name
insmod: error inserting '/lib/modules/extra/my_driver.ko': -1 Unknown symbol in module
insmod: error inserting '/lib/modules/extra/my_driver.ko': -1 Unknown symbol in module
I guess my_driver doesn't see the functions by some reason, or these are not exported to the kernel symbols at all.
Any suggestions?
With best regards,
Konstantin Boyanov
P.S. Right now I'm going through LDD3 by Rubini, It would be nice if somebody directs me to a particular part of the book that discusses similar issues.
