Rename your module.c as first.c and modify your
Makefile as follows
-----------------
ifneq ($(KERNELRELEASE),)
obj-m := module.o
module-objs += first.o extra.o
else
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
all:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
endif
-------------------
Now "make", it will create module.ko, which you can
safely "insmod"
Hope this will help
Regards
Suneesh
--- Sascha Effert <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
> make -C /lib/modules/2.6.8-24.10-default/build
>
>
SUBDIRS=/afs/uni-paderborn.de/user/f/fermat/VDrive/test
> modules
> make[1]: Entering directory
> `/usr/src/linux-2.6.8-24.10-obj/i386/default'
> make -C ../../../linux-2.6.8-24.10
> O=../linux-2.6.8-24.10-obj/i386/default
> modules
> CC [M]
>
/afs/uni-paderborn.de/user/f/fermat/VDrive/test/extra.o
> LD [M]
>
/afs/uni-paderborn.de/user/f/fermat/VDrive/test/module.o
> Building modules, stage 2.
> MODPOST
> *** Warning: "test_function"
>
>
[/afs/uni-paderborn.de/user/f/fermat/VDrive/test/module.ko]
> undefined!
> *** Warning: "test_int"
>
>
[/afs/uni-paderborn.de/user/f/fermat/VDrive/test/module.ko]
> undefined!
> LD [M]
>
/afs/uni-paderborn.de/user/f/fermat/VDrive/test/module.ko
> make[1]: Leaving directory
> `/usr/src/linux-2.6.8-24.10-obj/i386/default'
> formate@albana:~/imt/VDrive/test>
> ----end output----
>
> I do not understand the two Warnings. Why are
> test_function and
> test_init undefined? What is wrong?
>
> I would be pleased if someone could help me.
>
>
>
> thanks for your time,
>
>
> Sascha Effert
>
>
> --
> Kernelnewbies: Help each other learn about the Linux
> kernel.
> Archive:
> http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
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