linux-kernel - Re: [PATCH] s390/perf: fix 'start' address of module's map

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Date:	Tue, 26 Jul 2016 08:54:33 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Songshan Gong <gongss@...ux.vnet.ibm.com>
Cc:	acme@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	linux-kernel@...r.kernel.org, borntraeger@...ibm.com
Subject: Re: [PATCH] s390/perf: fix 'start' address of module's map

On Fri, Jul 22, 2016 at 10:47:34AM +0800, Songshan Gong wrote:
> Has the patch been accepted by upstream?
> 
> 在 7/21/2016 11:10 AM, Song Shan Gong 写道:
> > At preset, when creating module's map, perf gets 'start' address by parsing
> > '/proc/modules', but it's module base address, isn't the start address of
> > '.text' section. In most archs, it's OK. But for s390, it places 'GOT' and
> > 'PLT' relocations before '.text' section. So there exists an offset between
> > module base address and '.text' section, which will incur wrong symbol
> > resolution for modules.
> > 
> > Fix this bug by getting 'start' address of module's map from parsing
> > '/sys/module/[module name]/sections/.text', not from '/proc/modules'.
> > 
> > Signed-off-by: Song Shan Gong <gongss@...ux.vnet.ibm.com>
> > Acked-by: Jiri Olsa <jolsa@...nel.org>

I think it's good to go, Arnaldo, could you please take this one?

thanks,
jirka