Re: 2.4.32: unresolved symbol unregister_qdisc

["Randy.Dunlap" <rdunlap@xenotime.net>]

On Sun, 9 Apr 2006 13:37:25 -0400 (EDT) George P Nychis wrote:

> Thanks for the help.
> 
> Here is the makefile:
> http://rafb.net/paste/results/auchPH75.html
> 
> And here is the full errors I receive:
> http://rafb.net/paste/results/Qplpqw74.html
> 
> Greatly appreciate it
> 
> - George

[repeat: please don't top-post]

I don't know how much I can help you.  It's been a long time since
I've built external modules on 2.4.x.

Problems that I see:
- the Makefile does not use the expected 2.4 kernel build infrastructure;
- kernel Makefile uses -nostdinc to prevent use of userspace headers;
- Makefile is trying to include userspace headers instead of kernel headers, e.g.:
  In file included from /usr/include/linux/if_ether.h:107,
                 from /usr/include/linux/netdevice.h:29,
                 from sch_xcp.c:8:
- this specified include directory is only in 2.6.x, not 2.4.x:
  -I/lib/modules/`uname -r`/build/include/asm/mach-default

It's not clear to me how this makefile could work with 2.4.x at all.
Is it supposed to, or that's just what you want to see it do?

You could try to fix the Makefile based on makefile-changes articles at lwn.net.
E.g.:
http://lwn.net/Articles/151784/
http://lwn.net/Articles/79984/
http://lwn.net/Articles/74767/
http://lwn.net/Articles/69148/
http://lwn.net/Articles/21823/



> > On Sat, 8 Apr 2006 19:18:47 -0400 (EDT) George P Nychis wrote:
> > 
> >> Yeah, this module is unfortunately not under the GPL, it was made for
> >> research and i am not the author, I was only given the code for my own
> >> research.
> >> 
> >> I enabled that support in the kernel, and then tried to recompile and
> >> get tons of errors/warnings... so maybe I am missing something else to
> >> be enabled in the kernel... here are a few examples of errors: 
> >> /usr/include/linux/skbuff.h:30:26: net/checksum.h: No such file or
> >> directory /usr/include/asm/irq.h:16:25: irq_vectors.h: No such file or
> >> directory /usr/include/linux/irq.h:72: error: `NR_IRQS' undeclared here
> >> (not in a function) /usr/include/asm/hw_irq.h:28: error:
> >> `NR_IRQ_VECTORS' undeclared here (not in a function)
> >> 
> >> I think those are the top most errors, so if i can fix those hopefully
> >> the rest shall vanish!
> > 
> > Looks like a Makefile problem then.  Can you post the Makefile? Hopefully
> > it is using a Makefile and not just an elaborate gcc command line.
> > 
> > [and please don't top-post]
> > 
> >> - George
> >> 
> >> 
> >>> From: "George P Nychis" <gnychis@cmu.edu> Date: Sat, 8 Apr 2006
> >>> 18:47:34 -0400 (EDT)
> >>> 
> >>>> Hey,
> >>>> 
> >>>> I have a kernel module that uses unregister_qdisc and
> >>>> register_qdisc, whenever i try to insert the module I get: 
> >>>> /lib/modules/2.4.32/kernel/net/sched/sch_xcp.o: 
> >>>> /lib/modules/2.4.32/kernel/net/sched/sch_xcp.o: unresolved symbol 
> >>>> unregister_qdisc /lib/modules/2.4.32/kernel/net/sched/sch_xcp.o: 
> >>>> /lib/modules/2.4.32/kernel/net/sched/sch_xcp.o: unresolved symbol 
> >>>> register_qdisc
> >>>> 
> >>>> Am i missing some sort of support in the kernel?
> >>> 
> >>> Make sure CONFIG_NET_SCHED is enabled and that you compiled your
> >>> module against that kernel.
> >>> 
> >>> Where does this sch_xcp come from?  It's not in the vanilla sources.
> >>> 
> >>> Also, please direct networking questions to the
> >>> netdev@vger.kernel.org mailing list which I have added to the CC:.

---
~Randy