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Date: Wed, 23 Feb 2022 19:31:48 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Petr Mladek <pmladek@...e.com> Cc: John Ogness <john.ogness@...utronix.de>, Sergey Senozhatsky <senozhatsky@...omium.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>, Max Filippov <jcmvbkbc@...il.com>, David Sterba <dsterba@...e.com>, Samuel Iglesias Gonsálvez <siglesias@...lia.com>, Bhaskar Chowdhury <unixbhaskar@...il.com>, Igor Matheus Andrade Torrente <igormtorrente@...il.com>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, nick black <dankamongmen@...il.com> Subject: Re: [PATCH printk v1 13/13] console: introduce CON_MIGHT_SLEEP for vt 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
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