Re: 2.4.32: unresolved symbol unregister_qdisc

[George P Nychis]

> 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@xxxxxxx> 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@xxxxxxxxxxxxxxx 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
> 
> 

By kernel image, do you mean /usr/src/linux/vmlinux ?
if so,
lanthanum-ini linux # nm vmlinux | grep register_qdisc
c0399200 R __kstrtab_register_qdisc
c0399240 R __kstrtab_unregister_qdisc
c039ebc8 R __ksymtab_register_qdisc
c039ebd0 R __ksymtab_unregister_qdisc
c02eda40 T register_qdisc
c02edaf0 T unregister_qdisc

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