On Mon, Sep 24, 2012 at 9:41 PM, Ramesh.P [off-list ref] wrote:

Hi,

Please see my comments inline.

On Fri, Sep 21, 2012 at 2:39 PM, Pritam Bankar
[off-list ref] wrote:

quoted

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.

quoted

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

quoted

On Wed, Sep 19, 2012 at 6:24 AM, Ramesh.P [off-list ref] wrote:

quoted

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
[off-list ref] wrote:

quoted

On Tue, Sep 18, 2012 at 7:27 PM, Pritam Bankar
[off-list ref] wrote:

quoted

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

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