linux-kernel - Re: [PATCH printk v2 08/26] printk: nbcon: Implement processing in port->lock wrapper

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Message-ID: <87plvy31hg.fsf@jogness.linutronix.de>
Date: Wed, 13 Mar 2024 10:55:47 +0106
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, Steven Rostedt
 <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de>,
 linux-kernel@...r.kernel.org, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, Ilpo
 Järvinen <ilpo.jarvinen@...ux.intel.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Tony Lindgren <tony@...mide.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>, Justin Chen
 <justin.chen@...adcom.com>, Jiaqing Zhao <jiaqing.zhao@...ux.intel.com>,
 linux-serial@...r.kernel.org, Peter Collingbourne <pcc@...gle.com>
Subject: Re: [PATCH printk v2 08/26] printk: nbcon: Implement processing in
 port->lock wrapper

On 2024-03-11, John Ogness <john.ogness@...utronix.de> wrote:
> And I think you identified a bug relating to the setup() callback.

Actually this bug was recently fixed by Peter Collingbourne:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/kernel/printk/printk.c?h=next-20240313&id=801410b26a0e8b8a16f7915b2b55c9528b69ca87

One nice thing that has risen from this is we are starting to see
exactly what the console lock is needed for. At this point I would say
its main function is synchronizing boot consoles with real
drivers. Which means we will not be able to remove the console lock
until we find a real solution to match boot consoles (which circumvent
the Linux driver model) with the real drivers.

John