linux-kernel - Re: [PATCH printk v2 05/18] printk: Atomic print in printk context on shutdown

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Message-ID: <Zmrm00TEOx-ktxKD@pathway.suse.cz>
Date: Thu, 13 Jun 2024 14:32:41 +0200
From: Petr Mladek <pmladek@...e.com>
To: John Ogness <john.ogness@...utronix.de>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v2 05/18] printk: Atomic print in printk context
 on shutdown

On Tue 2024-06-04 01:30:40, John Ogness wrote:
> For nbcon consoles, normally the printing is handled by the
> dedicated console printing threads. However, on shutdown the
> printing threads may not get a chance to print the final
> messages.
> 
> When shutting down or rebooting (system_state > SYSTEM_RUNNING),
> perform atomic printing from the printk() caller context.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

Sigh, the checks/logic gets really complicated. But I can't think
of anything better at the moment. And it seems that the check for
the system state is added at the right locations.

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr