linux-kernel - Re: How to link a .o with all modules

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Message-Id: <9B953237-99D2-4593-9A29-242424CDDB29@kernel.crashing.org>
Date:	Mon, 2 Jun 2008 23:55:19 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	lkml List <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...abs.org list" <linuxppc-dev@...abs.org>
Subject: Re: How to link a .o with all modules


On May 8, 2008, at 3:22 PM, Sam Ravnborg wrote:

> On Thu, May 08, 2008 at 09:16:10AM -0500, Kumar Gala wrote:
>>
>> On May 5, 2008, at 3:44 PM, Sam Ravnborg wrote:
>>
>>>>>
>>>>>
>>>>> Let me know if this does address your question.
>>>>
>>>> The problem is MODPOST complains about undefined symbols:
>>>>
>>>> MODPOST 24 modules
>>>> ERROR: "_restgpr_20_x" [net/key/af_key.ko] undefined!
>>>> ERROR: "_restgpr_25_x" [net/key/af_key.ko] undefined!
>>>> ERROR: "_restgpr_30_x" [net/key/af_key.ko] undefined!
>>>
>>> I need a bit more context to try to analyse this.
>>> Where did you expect _restgpr_20_x to be defined.
>>> If in vmlinux then were they present in the
>>> Module.symvers file?
>>
>> No they aren't there since we I'm not EXPORT_SYMBOL() them.  Should I
>> also be doing EXPORT_SYMBOL?
>
> So modpost claim it cannot find the symbols.
>
>>
>>> If in the linked in .o file - could you
>>> see the symbols using objdump.
>>
>> Yes.
>>
>> readelf -a:
>>
>> ...
>> Symbol table '.symtab' contains 113 entries:
>>   Num:    Value  Size Type    Bind   Vis      Ndx Name
>> ...
>>     5: 00000000     0 FUNC    GLOBAL DEFAULT    1 _savegpr_14
>>     6: 00000000     0 FUNC    GLOBAL DEFAULT    1 _save32gpr_14
>> ...
>
> Strange.
>
> I did not look closer.
> But it looks like the linker failed to resolve these symbols
> in the final link somehow - despite the symbols are present in
> the linked in .o file.
>
> Can you try to drop me the output of the relocation records for the
> finally linked .o file (the one with your .o file linked in).
>
> objdump -r IIRC


Sam,

Didn't see any feedback from the relocation records.

- k
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