linux-kernel - Re: maps mismatch in /proc/kcore for sparc

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Message-ID: <5509D8C7.5080504@oracle.com>
Date:	Wed, 18 Mar 2015 13:57:59 -0600
From:	David Ahern <david.ahern@...cle.com>
To:	David Miller <davem@...emloft.net>
CC:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: maps mismatch in /proc/kcore for sparc

On 3/18/15 1:43 PM, David Miller wrote:
> From: David Ahern <david.ahern@...cle.com>
> Date: Wed, 18 Mar 2015 10:56:22 -0600
>
>> I am trying to understand why the perf tool on sparc fails to convert
>> kernel symbols when /proc/kcore is used. I have instrumented perf to
>> the point I can see that it drops symbols from kallsyms because it
>> cannot find a corresponding map when the kernel maps are created based
>> on parsing /proc/kcore.
>
> I'm looking into this, I think we need to set ARCH_PROC_KCORE_TEXT in
> arch/sparc/Kconfig

Missed that config in my fumbling through the kcore code. Adding it to 
sparc/Kconfig and it works. map is added:

kcore_mapfn: dso [kernel.kallsyms]: new map from 404000 to e33d79

and kernel symbols are not dropped. One mystery solved.

Thanks,
David
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