Juan Gonzalez wrote:
>
> Here's a simple example that may help in resolving this issue.
>
> Below I'm attaching the source code for a bare-minimum module (based on an
> example from Rubini's book). While running Linux 2.2.12-20smp, I compile the
> code below with "gcc -c hello.c", producing the module "hello.o" . However,
> insmod complains:
>
> root# gcc -c hello.c
> root# /sbin/insmod hello
> ./hello.o: unresolved symbol printk
>
> Could someone out there please try this on your smp system and let me know your
> results? Thanks.
>
> My questions are:
> 1. Is there something wrong with how I'm building the module, or is there a
> problem with my smp installation?
The compilation options suggested before are really necessary, -Wall,
for example would have told you that you were not prototyping printk,
which means you need to add a header file for it.
You should try to compile your modules with something like this:
gcc -D__SMP__ -D__KERNEL__ -DMODULE -O2 -Wall -I/usr/src/linux/include
-Wstrict-prototypes -fomit-frame-pointer -fno-strength-reduce -pipe
-m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c
-o hello.o hello.c
> 2. What can I do to resolve this?
------- hello.c
#include <linux/kernel.h>
#include <linux/module.h>
int init_module(void)
{
printk("<1>Hello, world\n");
return 0;
}
void cleanup_module(void)
{
printk("<1>Goodbye cruel world\n");
}
-------
The above should work.
--
Rafael Herrera
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