linux-kernel - Re: LTS perf unwind fix

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Date:   Thu, 27 May 2021 10:04:51 +0000
From:   "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jan.kratochvil@...hat.com" <jan.kratochvil@...hat.com>
Subject: Re: LTS perf unwind fix

Hi Greg,

Please apply these two commits to 5.4.y
(other LTSes are probably fine too, but I didn't test):


commit bf53fc6b5f415cddc7118091cb8fd6a211b2320d
Author: Jan Kratochvil <jan.kratochvil@...hat.com>
Date:   Fri Dec 4 09:17:02 2020 -0300

    perf unwind: Fix separate debug info files when using elfutils'
libdw's unwinder


commit 4e1481445407b86a483616c4542ffdc810efb680
Author: Dave Rigby <d.rigby@...com>
Date:   Thu Feb 18 16:56:54 2021 +0000

    perf unwind: Set userdata for all __report_module() paths

    [...]

    Fixes: bf53fc6b5f41 ("perf unwind: Fix separate debug info files
when using elfutils' libdw's unwinder")


These commits fix some broken backtraces when using the perf tool.

Thanks!
-Tommi