Getting undefined reference , how to link during module building ?

[Ramesh Rajagopal]

Hi Guys,
   I am trying to do the following but I am getting undefined reference
error ?

I have two modules lets say Module A & Module B. Module B defines a function
called
module_b_func() which got exported also. Then I compile module B and
inserted into kernel using insmod.

Then in module A I tried to call module B's function module_b_func(), When I
tried to compile
I am getting undefined reference to module_b_func(). How to link moduleB's
function here.

Do I need to give some options to the linker or how to compile ?

The following is my Makefile contents :

obj-m := module_A.o

M=$(shell pwd)

all:
    make -C /lib/modules/$(shell uname -r)/build/ M=$(M) modules
clean:
    rm -rf *.o *.ko
distclean:
    rm -rf *.markers *.order *.symvers


Thanks,
Ramesh.