linux-kernel - Re: GCOV doesn't seem to work on ARM with kernel 2.6.35-rc6

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Message-ID: <4C502CC5.7070205@linux.vnet.ibm.com>
Date:	Wed, 28 Jul 2010 15:12:37 +0200
From:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
To:	Karol Lewandowski <k.lewandowsk@...sung.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: GCOV doesn't seem to work on ARM with kernel 2.6.35-rc6

On 27.07.2010 09:35, Karol Lewandowski wrote:
> On 07/26/2010 06:57 PM, Peter Oberparleiter wrote:
>> Karol Lewandowski wrote:
>>> On 07/26/2010 12:32 PM, Karol Lewandowski wrote:
>>>> I'm trying to use code coverage measurements with mainline Linux kernel
>>>> 2.6.35-rc6 on ARM platform (specifically on Samsung's S5PC110 board).
> ...
>> I just tested gcov support for 2.6.35-rc6 on s390 and it works without
>> a problem. My assumption would be that you are using an EABI-GCC to
>> compile your kernel. Those compilers name their constructor symbols
>
> Exactly.
>
>> differently than the vanilla GCC so that the whole constructor calling
>> mechanism on which the gcov support relies, will fail. If that is
>> indeed the case, the following testing patch should solve your
>> problem:
>
> Yes, that was the case and your patch indeed solved my problem.

Excellent. I could imagine that other ARM users might also benefit from 
this patch. Before I submit it for integration though, I need to make 
sure that it also works for kernel modules. Could you enable profiling 
for a kernel module and verify that you are seeing files in 
/sys/kernel/debug/gcov belonging to that module??


Regards,
   Peter Oberparleiter

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