Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753785Ab0G1NNN (ORCPT ); Wed, 28 Jul 2010 09:13:13 -0400 Received: from mtagate5.uk.ibm.com ([194.196.100.165]:35416 "EHLO mtagate5.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752959Ab0G1NNF (ORCPT ); Wed, 28 Jul 2010 09:13:05 -0400 Message-ID: <4C502CC5.7070205@linux.vnet.ibm.com> Date: Wed, 28 Jul 2010 15:12:37 +0200 From: Peter Oberparleiter MIME-Version: 1.0 To: Karol Lewandowski CC: linux-kernel@vger.kernel.org Subject: Re: GCOV doesn't seem to work on ARM with kernel 2.6.35-rc6 References: <4C4D6458.6040402@samsung.com> <4C4D6554.30707@samsung.com> <4C4DBE8E.70102@linux.vnet.ibm.com> <4C4E8C2C.3000903@samsung.com> In-Reply-To: <4C4E8C2C.3000903@samsung.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1466 Lines: 35 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/