linux-kernel - Re: [PATCH 2/3] printk/nbcon/panic: Allow printk kthread to sleep when the system is in panic

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Message-ID: <84y0q1gty4.fsf@jogness.linutronix.de>
Date: Fri, 26 Sep 2025 16:44:27 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby
 <jirislaby@...nel.org>, Sergey Senozhatsky <senozhatsky@...omium.org>,
 Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner
 <tglx@...utronix.de>, Esben Haabendal <esben@...nix.com>,
 linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, Andy
 Shevchenko <andriy.shevchenko@...ux.intel.com>, Arnd Bergmann
 <arnd@...db.de>, Tony Lindgren <tony@...mide.com>, Niklas Schnelle
 <schnelle@...ux.ibm.com>, Serge Semin <fancer.lancer@...il.com>, Andrew
 Murray <amurray@...goodpenguin.co.uk>, Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH 2/3] printk/nbcon/panic: Allow printk kthread to sleep
 when the system is in panic

On 2025-09-26, Petr Mladek <pmladek@...e.com> wrote:
> The printk kthread might be running when there is a panic in progress.
> But it is not able to acquire the console ownership any longer.
>
> Prevent the desperate attempts to acquire the ownership and allow sleeping
> in panic. It would make it behave the same as when there is any CPU
> in an emergency context.
>
> Signed-off-by: Petr Mladek <pmladek@...e.com>

Reviewed-by: John Ogness <john.ogness@...utronix.de>