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Date:   Thu, 27 May 2021 12:22:37 +0200
From:   "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
To:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@nokia.com>
Cc:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "jan.kratochvil@redhat.com" <jan.kratochvil@redhat.com>
Subject: Re: LTS perf unwind fix
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On Thu, May 27, 2021 at 10:04:51AM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
> 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@redhat.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@me.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.

Also queued up for the 5.10.y tree as you do not want to move to a newer
kernel and have a regression.

thanks,

greg k-h