linux-kernel - Re: [PATCH printk v4 7/8] printk: nbcon: Add emit function and callback function for atomic printing

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Message-ID: <ZQQT8B2LGJWY2gm5@alley>
Date:   Fri, 15 Sep 2023 10:21:04 +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,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH printk v4 7/8] printk: nbcon: Add emit function and
 callback function for atomic printing

On Fri 2023-09-08 20:56:07, John Ogness wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> Implement an emit function for nbcon consoles to output printk
> messages. It utilizes the lockless printk_get_next_message() and
> console_prepend_dropped() functions to retrieve/build the output
> message. The emit function includes the required safety points to
> check for handover/takeover and calls a new write_atomic callback
> of the console driver to output the message. It also includes
> proper handling for updating the nbcon console sequence number.
> 
> A new nbcon_write_context struct is introduced. This is provided
> to the write_atomic callback and includes only the information
> necessary for performing atomic writes.
> 
> Co-developed-by: John Ogness <john.ogness@...utronix.de>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> Signed-off-by: Thomas Gleixner (Intel) <tglx@...utronix.de>

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

Best Regards,
Petr