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Date:   Wed, 23 Feb 2022 19:31:48 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Petr Mladek <pmladek@suse.com>
Cc:     John Ogness <john.ogness@linutronix.de>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org, Jiri Slaby <jirislaby@kernel.org>,
        Max Filippov <jcmvbkbc@gmail.com>,
        David Sterba <dsterba@suse.com>,
        Samuel Iglesias =?iso-8859-1?Q?Gons=E1lvez?= 
        <siglesias@igalia.com>, Bhaskar Chowdhury <unixbhaskar@gmail.com>,
        Igor Matheus Andrade Torrente <igormtorrente@gmail.com>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        nick black <dankamongmen@gmail.com>
Subject: Re: [PATCH printk v1 13/13] console: introduce CON_MIGHT_SLEEP for vt
Message-ID: <YhZ9lHQjq7urH120@kroah.com>
References: <20220207194323.273637-1-john.ogness@linutronix.de>
 <20220207194323.273637-14-john.ogness@linutronix.de>
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On Wed, Feb 23, 2022 at 02:37:55PM +0100, Petr Mladek wrote:
> On Mon 2022-02-07 20:49:23, John Ogness wrote:
> > Deadlocks and the framebuffer console have been a recurring issue
> > that is getting worse. Daniel Vetter suggested [0] that
> > fbcon->write() should no longer be called from an atomic context.
> 
> We should make it clear that people will not longer see kernel
> messages on ttyX during early boot, panic, and in some other
> situations when printk kthreads are not available.
> 
> Or do I miss something?
> 
> Do we really want this?
> 
> Do the tty maintainers really want to give up on supporting
> modes when processes/kthreads do not work?

I would love that, but:

> Maybe, it is inevitable. Maybe, people are not using tty
> for debugging too much.

People are using tty consoles for debugging all the time.  We can not
break that.

thanks,

greg k-h