linux-kernel - Re: [PATCH] pstore/ftrace: add a kernel parameter to start pstore recording

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Message-ID: <20211116172835.r3puikipzryxnsoj@pengutronix.de>
Date:   Tue, 16 Nov 2021 18:28:35 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Tony Luck <tony.luck@...el.com>, Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        kernel@...gutronix.de, Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH] pstore/ftrace: add a kernel parameter to start pstore
 recording

Hello Steven,

On Tue, Nov 16, 2021 at 12:06:03PM -0500, Steven Rostedt wrote:
> On Thu, 10 Jun 2021 10:21:34 +0200
> Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:
> 
> > With this knob you can enable pstore recording early enough to debug
> > hangs happening during the boot process before userspace is up enough to
> > enable it via sysfs.
> 
> Is this still needed? It's still in my internal patchwork, and I haven't
> seen any responses.

I didn't see any responses either, and unless someone else implemented
something similar somewhere else, it's still needed.

The change was actually useful to debug a clk problem, where the machine
freezed when a certain driver was loaded.

Thanks for keeping track of this change. I would only have noticed it
missing next time when I have to debug a similar problem.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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