A Newbie question

[C.Mohanasundaram <mohanc@lucid.co.in>]

Hi all,

i was trying to write a kernel module and i got some compilation error when i 
included sched.h. so i wrote a simple module to test it. i got the same 
compilation error.I have given the code, makefile and also the dump of the 
error below. What is the mistake i m doing
I m using RedHat 7.1 and my kernel version is 2.4.2-2 on an i686

/*code*/

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

int init_module()
{
	printk("Hello");
}

void cleanup_module()
{
	printk("Bye");	
}

#------------------------------------
#makefile
#------------------------------------

KERNELDIR=/usr/src/linux-2.4.2

testmod.o	:
			gcc -DKERNEL -DMODULE -DLINUX -O2 -Wall -I$(KERNELDIR)/include -c testmod.c
		
clean	:
		rm -f *.o *~ core

######################
#compilation error
######################
In file included from /usr/src/linux-2.4.2/include/linux/sched.h:15,
                 from testmod.c:3:
/usr/src/linux-2.4.2/include/linux/timex.h:171: field `time' has incomplete 
type
In file included from /usr/src/linux-2.4.2/include/linux/sched.h:80,
                 from testmod.c:3:
/usr/src/linux-2.4.2/include/linux/timer.h:21: field `vec' has incomplete type
/usr/src/linux-2.4.2/include/linux/timer.h:26: field `vec' has incomplete type
/usr/src/linux-2.4.2/include/linux/timer.h:52: field `list' has incomplete 
type
/usr/src/linux-2.4.2/include/linux/timer.h: In function `timer_pending':
/usr/src/linux-2.4.2/include/linux/timer.h:111: warning: control reaches end 
of non-void function
testmod.c: In function `init_module':
testmod.c:7: warning: implicit declaration of function `printk'
testmod.c:8: warning: control reaches end of non-void function
make: *** [testmod.o] Error 1

thanks and regards,
mohan
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