Missing __versions section on .ko

[Ramesh.P]

Hi,

Please see my comments inline.

On Fri, Sep 21, 2012 at 2:39 PM, Pritam Bankar
<pritambankar1988 at gmail.com> wrote:
> Hi Ramesh thanks for great pdf. From whatever I understood after
> reading I fired command modinfo on my module and it gave output ,
>
> vermagic:       3.2.0-23-generic-pae SMP mod_unload modversions 686
>
> greping out vermagic. So I believe vermagic is behaving correctly.
> What is 686 in output ?
It represents the arch. the module is built for. In this case, it is 686.

> Any other reason for missing __versions section ?
The other reason for invalid format is mismatch in arch. like mips vs
686. It looks like you are trying to run this module on a 386 machine.
Can you confirm you have recompiled the module on the kernel you are
trying to link.

Thanks,
Ramesh

>
> On Wed, Sep 19, 2012 at 6:24 AM, Ramesh.P <rameshpa at gmail.com> wrote:
>> Hi,
>>
>> 'Invalid module' is typically thrown when you don't compile your
>> module against the kernel you are linking into. I think __versions
>> section is added by vermagic.o as part of build process. Please refer
>> http://lwn.net/images/pdf/LDD3/ch02.pdf, Version dependency section
>> for more details.
>>
>> Thanks,
>> Ramesh
>>
>> On Tue, Sep 18, 2012 at 7:10 AM, Pritam Bankar
>> <pritambankar1988 at gmail.com> wrote:
>>> On Tue, Sep 18, 2012 at 7:27 PM, Pritam Bankar
>>> <pritambankar1988 at gmail.com> wrote:
>>>> Any idea what causes __versions section to get added in *.ko module. A
>>>> simple hello.ko on ubuntu 12.04 i386 machine gets loaded successfully.
>>>> Other module just doesn't get loaded giving error " Invalid module ".
>>>> When I compared both modules with objdump -h I found __versions
>>>> section was missing from second module and that can be the reason its
>>>> not getting loaded. How can I add this section to other .ko ? What
>>>> causes __versions to get added in ko ?
>>>
>>>
>>> I have compiled both modules with modpost and Module.symvers.
>>>
>>>
>>>  Thanks,
>>>  Pritam Bankar
>>>
>>> --
>>>
>>> Pritam Bankar
>>>
>>> _______________________________________________
>>> Kernelnewbies mailing list
>>> Kernelnewbies at kernelnewbies.org
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>
>
>
> --
>
> Pritam Bankar