hi all
i think the extra.c has to be other module.define it
in init_module and exit_module formate and then try to
use the exported symbols ,i think it will be fine
regards
--- kernelnewbies-bounce@xxxxxxxxxxxx
<fermat@xxxxxxxxxxxxxxxx> wrote:
> Hello,
>
> I am trying to port a module written for the 2.4
Kernels to 2.6 Kernels.
> One of my first step was to use the kernel-build
system. Following the
> Documentation of the makefiles in
Documentation/kbuild/makefiles.txt I
> wrote following Makefile:
>
> ----start Makefile----
> ifneq ($(KERNELRELEASE),)
> obj-m := module.o
> module-objs += extra.o
>
> else
> KDIR := /lib/modules/$(shell uname -r)/build
> PWD := $(shell pwd)
>
> all:
> $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
>
> endif
> ----end Makefile----
>
> This Makefile should compile module.c and extra.c
and link them to one
> object. So I wrote two .c-files. First the module.c:
>
> ----start module.c----
> #include <linux/version.h>
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/config.h>
> #include <linux/sysctl.h>
> #include <linux/devfs_fs_kernel.h>
> #include <linux/proc_fs.h>
>
> int test_int = 0;
>
> void test_function(void) {
> return ;
> }
>
> static int __init mymodule_init (void) {
> printk (KERN_INFO "module starts\n");
> return (0);
> }
>
> static void __exit mymodule_exit (void) {
> printk(KERN_INFO "module ends\n");
> return;
> }
>
> module_init(mymodule_init);
> module_exit(mymodule_exit);
>
> MODULE_LICENSE("GPL");
>
> EXPORT_SYMBOL (test_function);
> EXPORT_SYMBOL (test_int);
> ----end module.c----
>
> and a extra.c which uses the test_function and
test_int defined and
> exportet in module.c:
>
> ----start extra.c----
> extern void test_function(void);
> extern int test_int;
>
> void try_this(void) {
> test_function();
> test_int++;
> return;
> }
> ----end extra.c----
>
> So I thought that try_this would use the
test_function defined and
> exportet in module.c. But compiling the function
results in following
> output:
>
> ----start output----
> formate@albana:~/imt/VDrive/test> make
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