linux-kernel - Re: [PATCH printk v3 09/15] printk: refactor and rework printing logic

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Message-ID: <YmAe3ZHtD2djIasE@alley>
Date:   Wed, 20 Apr 2022 16:55:25 +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 v3 09/15] printk: refactor and rework printing
 logic

On Wed 2022-04-20 01:52:31, John Ogness wrote:
> Refactor/rework printing logic in order to prepare for moving to
> threaded console printing.
> 
> - Move @console_seq into struct console so that the current
>   "position" of each console can be tracked individually.
> 
> - Move @console_dropped into struct console so that the current drop
>   count of each console can be tracked individually.
> 
> - Modify printing logic so that each console independently loads,
>   prepares, and prints its next record.
> 
> - Remove exclusive_console logic. Since console positions are
>   handled independently, replaying past records occurs naturally.
> 
> - Update the comments explaining why preemption is disabled while
>   printing from printk() context.
> 
> With these changes, there is a change in behavior: the console
> replaying the log (formerly exclusive console) will no longer block
> other consoles. New messages appear on the other consoles while the
> newly added console is still replaying.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

It might be because I have already seen this code several times. But
I really like how it splits the monolithic console_unlock().

It might also mean that I have become blind. But I do not see any
problem anymore ;-)

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

Best Regards,
Petr