linux-kernel - Re: [PATCH printk v2 22/38] serial: kgdboc: document console

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Message-ID: <CAD=FV=WYa2SEFkARyHqJFLt4vBfC9zzdnRZeaXGoa-aGtPVRiQ@mail.gmail.com>
Date:   Mon, 24 Oct 2022 17:36:59 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net, linux-serial@...r.kernel.org
Subject: Re: [PATCH printk v2 22/38] serial: kgdboc: document console_lock usage

Hi,

On Wed, Oct 19, 2022 at 7:56 AM John Ogness <john.ogness@...utronix.de> wrote:
>
> kgdboc_earlycon_init() uses the console_lock to ensure that no consoles
> are unregistered until the kgdboc_earlycon is setup. This is necessary
> because the trapping of the exit() callback assumes that the exit()
> callback is not called before the trap is setup.
>
> Explicitly document this non-typical console_lock usage.
>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> ---
>  drivers/tty/serial/kgdboc.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

Reviewed-by: Douglas Anderson <dianders@...omium.org>