linux-kernel - Re: [BUG] Threaded printk breaks early debugging

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Date:   Mon, 13 Jun 2022 01:08:23 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Petr Mladek <pmladek@...e.com>
Cc:     Peter Geis <pgwipeout@...il.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [BUG] Threaded printk breaks early debugging

On 2022-06-12, Sergey Senozhatsky <senozhatsky@...omium.org> wrote:
> Should a situation when we have only one online CPU be enough of a
> reason to do direct printing? Otherwise we might not have CPUs to
> wakeup khtread on, e.g. when CPU that printk is in atomic section for
> too long.

IMHO, no. Especially in that situation, we do not want printk causing
that atomic section to become even longer. If the machine has entered
normal operation, we want printk out of the way.

John Ogness