linux-kernel - Re: DW_AT_comp_dir and O= usage not working with objdump -dS, perf probe, etc

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Message-ID: <aBTzw5t5u9CLIqhI@x1>
Date: Fri, 2 May 2025 13:33:07 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Ravi Bangoria <ravi.bangoria@....com>,
	Joe Mario <jmario@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: Re: DW_AT_comp_dir and O= usage not working with objdump -dS, perf
 probe, etc

On Thu, May 01, 2025 at 08:59:39AM +0200, Thomas Weißschuh wrote:
> Hi Arnaldo,
> 
> On 2025-04-30 20:34:34-0300, Arnaldo Carvalho de Melo wrote:
> > 	I noticed recently while testing some other patches that
> > disassembling with objdump -dS didn't work when building the kernel with
> > O= as it sets it to the build dir, not to where the sources are, for
> > instance:
> 
> <snip>
> 
> > I haven't checked, ran out of time today, but I think this may be
> > involved:
> > 
> > commit 97282e6d380db8a07120fe1b794ac969ee4a3b5c
> > Author: Thomas Weißschuh <linux@...ssschuh.net>
> > Date:   Sat Mar 22 10:03:16 2025 +0100
> > 
> >     x86: drop unnecessary prefix map configuration
> 
> It should be caused by this one:
> 
> commit cacd22ce69585a91c386243cd662ada962431e63
> Author: Thomas Weißschuh <linux@...ssschuh.net>
> Date:   Sat Mar 15 14:20:14 2025 +0100
> 
>     kbuild: make all file references relative to source root
> 
> 
> There is already another report about objdump here:
> https://lore.kernel.org/lkml/aBEttQH4kimHFScx@intel.com/
> 
> Let's continue the discussion there.

Thanks, I'll follow that discussion then.

- Arnaldo