Missing __versions section on .ko

[Pritam Bankar]

On Mon, Sep 24, 2012 at 9:41 PM, Ramesh.P <rameshpa at gmail.com> wrote:
> 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.
>
   Yes I am running this module on i386 machine and I am linking
compiled module on same kernel 3.2.0-23-generic-pae
   My module works perfectly on x86_64 machine which has same kernel
3.2.0-23-generic but without -pae
>>
>> 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
>>>>
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>>
>>
>>
>> --
>>
>> Pritam Bankar



-- 

Pritam Bankar