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    SubjectRe: 2.4.32: unresolved symbol unregister_qdisc
    On Sun, 9 Apr 2006 22:05:33 -0400 (EDT) George P Nychis wrote:

    >
    > > 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
    > >
    > >
    >
    > By the way, if I add -I/usr/src/linux/include to the compile line, it successfully compiles, however, i am back to the start:
    > lanthanum-ini src-1.0.1 # insmod sch_xcp
    > Using /lib/modules/2.4.32/kernel/net/sched/sch_xcp.o
    > /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

    Yet your 2.4.32 kernel image file does have those symbols in it?
    Can you verify that by using 'nm' on the kernel image file?

    If so, then I suppose that you'll need to make a small module test case
    that exhibits this behavior, or just tell us where to get the sch_xcp files...

    (re-added cc: for netdev)

    ---
    ~Randy
    -
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