return (0) is a must in init_module
Daniel Marian wrote:
> Hello Mohan,
> I think you have to add the following 2 lines to your code
>
> #define __KERNEL__
> #define MODULE
>
> remove <linux/sched.h>
>
> It compiled in my machine(Linux 7.0)
>
> regards
> daniel.
>
> "C.Mohanasundaram" wrote:
>
> > 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
> > -
> > Kernelnewbies: Help each other learn about the Linux kernel.
> > Archive: http://mail.nl.linux.org/kernelnewbies/
> > IRC Channel: irc.openprojects.net / #kernelnewbies
> > Web Page: http://www.kernelnewbies.org/
>
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