linux-kernel - Re: [PATCH] perf probe: skip test_uprobe_from_different

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Message-Id: <20230801092956.f03cd462fcf4939523ed4726@kernel.org>
Date:   Tue, 1 Aug 2023 09:29:56 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Georg Müller <georgmueller@....net>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf probe: skip test_uprobe_from_different_cu if there
 is no gcc

On Sat, 29 Jul 2023 12:59:50 +0200
Georg Müller <georgmueller@....net> wrote:

> 
> Am 29.07.23 um 02:38 schrieb Masami Hiramatsu (Google):
> >
> > Interesting, so clang will not generate DWARF or perf probe is not able to
> > handle clang generated DWARF?
> >
> 
> clang does not accept mixed -flto and non-lto CUs and the problem is not
> reproducible by this sample code using clang if using -flto for all CUs.
> There might be (bigger?) examples where the same issue is triggered by
> clang and bigger examples (like systemd on fedora) where I ran into the
> bug, but this small example only shows the problem when using gcc and
> mixing -flto and non-lto CUs.

Thanks for the explanation! So the problem will be in the compiler side
(and maybe fixed when it is updated.)

Thank you,

-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>