linux-kernel - Re: [PATCH] perf machine: Don't ignore

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Message-ID: <e2ec27b9-77d5-4224-b66a-1ef353e6c848@csgroup.eu>
Date: Thu, 9 Jan 2025 07:38:21 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>, Song Liu <songliubraving@...com>,
 linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf machine: Don't ignore _etext when not a text symbol



Le 08/01/2025 à 21:14, Arnaldo Carvalho de Melo a écrit :
> On Wed, Jan 08, 2025 at 10:15:24AM +0100, Christophe Leroy wrote:
>> Depending on how vmlinux.lds is written, _etext might be the very
>> first data symbol instead of the very last text symbol.
>>
>> Don't require it to be a text symbol, accept any symbol type.
> 
> I'm adding a Link:
> 
> Link: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fall%2F752a31b0-4370-4f52-b7cc-45f0078c1d6c%40csgroup.eu&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C914f4c7995574ee91f5c08dd30211dd6%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638719640997470461%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=kqCNbhhgKri3TlJaUb3mkTU6NyFRzhnb%2BDiK93h9aSQ%3D&reserved=0
> 
> To give more context as where this has been observed, and also add a
> snippet of your explanation there, this:
> 
> ----
> # grep -e _stext -e _etext -e _edata /proc/kallsyms
> c0000000 T _stext
> c08b8000 D _etext
> 
> So there is no _edata and _etext is not text

For the absence of _edata, I sent another patch, will you take it as 
well ? :

https://lore.kernel.org/linux-perf-users/2fec8c50c271dff59f0177ff0884b6c374486ba5.1736327770.git.christophe.leroy@csgroup.eu/T/#u

Thanks
Christophe