linux-kernel - Re: [PATCH printk v5 36/40] tty: serial: kgdboc: use console_list

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Message-ID: <CAD=FV=XhkmOLXnfc0YQyUN-FvNeoF1+=zvp56ttaYvsoKESMdA@mail.gmail.com>
Date:   Wed, 16 Nov 2022 16:59:23 -0800
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 v5 36/40] tty: serial: kgdboc: use
 console_list_lock for list traversal

Hi,

On Wed, Nov 16, 2022 at 8:22 AM John Ogness <john.ogness@...utronix.de> wrote:
>
> configure_kgdboc() uses the console_lock for console list iteration. Use
> the console_list_lock instead because list synchronization responsibility
> will be removed from the console_lock in a later change.
>
> The SRCU iterator could have been used here, but a later change will
> relocate the locking of the console_list_lock to also provide
> synchronization against register_console().
>
> Note, the console_lock is still needed to serialize the device()
> callback with other console operations.
>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> ---
>  drivers/tty/serial/kgdboc.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)

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