Problem for "insmod: unresolved symbol printk"

[Zhou Rui]

Hi, all
    I'm a newbie for linuxppc. I've tried to write a simple hello.c as a kernel module.

/*hello.c*/
#ifndef MODULE
#define MODULE
#endif

#ifndef __KERNEL__
#define __KERNEL__
#endif

#include <linux/module.h>
#include <linux/kernel.h>

int init_module(void)
{
        printk("Hello world 1.\n");
        return 0;
}

void cleanup_module(void)
{
        printk("Goodbye world 1.\n");
}

I wrote the code on a machine with Slackware installed. There was a PowerPC405EP board connected to the machined with NFS used. On the PowerPC board, the kernel is linuxppc-2.4.25-rthal5 and can be logged in via telnet. On the machine, there was also a toolchain for PowerPC and there were a series of commands beginning with "powerpc-linux-" existing. I've tried to cross-compile the source file with "powerpc-linux-gcc -c hello.c" or "powerpc-linux-gcc -c -DMODVERSIONS -I/usr/src/linuxppc-2.4.25/include hello.c" for PowerPC. But when I telneted into the board and run "insmod hello.o" on the PowerPC board, there always was "insmod: unresolved symbol printk". So would anyone give me some advice about the problem? Thank you very much.

 		
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