All of lore.kernel.org
 help / color / mirror / Atom feed
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 Gonsálvez" <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
Date: Wed, 23 Feb 2022 19:31:48 +0100	[thread overview]
Message-ID: <YhZ9lHQjq7urH120@kroah.com> (raw)
In-Reply-To: <YhY4s1WH5Rfjn+mn@alley>

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

  reply	other threads:[~2022-02-23 18:32 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-07 19:43 [PATCH printk v1 00/13] implement threaded console printing John Ogness
2022-02-07 19:43 ` [PATCH printk v1 01/13] printk: rename cpulock functions John Ogness
2022-02-11 12:44   ` Petr Mladek
2022-02-11 14:42     ` John Ogness
2022-02-11 20:57       ` Steven Rostedt
2022-02-11 21:04         ` Peter Zijlstra
2022-02-15  9:32           ` Petr Mladek
2022-02-15  9:13       ` Petr Mladek
2022-02-14  6:49     ` Sergey Senozhatsky
2022-02-14  9:45       ` John Ogness
2022-02-15  9:29       ` Petr Mladek
2022-02-16  3:27         ` Sergey Senozhatsky
2022-02-17 14:34         ` John Ogness
2022-02-07 19:43 ` [PATCH printk v1 02/13] printk: cpu sync always disable interrupts John Ogness
2022-02-11 12:58   ` Petr Mladek
2022-02-14  6:36     ` Sergey Senozhatsky
2022-02-07 19:43 ` [PATCH printk v1 03/13] printk: use percpu flag instead of cpu_online() John Ogness
2022-02-11 16:05   ` Petr Mladek
2022-02-14  7:08     ` Sergey Senozhatsky
2022-02-14  7:35     ` Sergey Senozhatsky
2022-02-15 10:38       ` Petr Mladek
2022-02-16  3:29         ` Sergey Senozhatsky
2022-03-02 14:21         ` John Ogness
2022-03-04 15:56           ` Petr Mladek
2022-03-05 17:05             ` Jason A. Donenfeld
2022-03-07 16:14               ` Petr Mladek
2022-02-16 13:58   ` two locations: was: " Petr Mladek
2022-03-02 14:49     ` John Ogness
2022-03-04 16:14       ` Petr Mladek
2022-03-07 10:06         ` John Ogness
2022-03-08 16:08       ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 04/13] printk: get caller_id/timestamp after migration disable John Ogness
2022-02-15  5:53   ` Sergey Senozhatsky
2022-02-15 11:56   ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 05/13] printk: call boot_delay_msec() in printk_delay() John Ogness
2022-02-15  5:58   ` Sergey Senozhatsky
2022-02-15 14:59     ` Petr Mladek
2022-02-16  3:21       ` Sergey Senozhatsky
2022-02-15 15:03   ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 06/13] printk: refactor and rework printing logic John Ogness
2022-02-16 15:43   ` Petr Mladek
2022-03-02 16:10     ` John Ogness
2022-02-07 19:43 ` [PATCH printk v1 07/13] printk: move buffer definitions into console_emit_next_record() caller John Ogness
2022-02-16 16:10   ` Petr Mladek
2022-03-02 16:25     ` John Ogness
2022-02-07 19:43 ` [PATCH printk v1 08/13] printk: add pr_flush() John Ogness
2022-02-17 10:11   ` Petr Mladek
2022-03-02 17:23     ` John Ogness
2022-03-04 13:24       ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 09/13] printk: add functions to allow direct printing John Ogness
2022-02-17 12:52   ` Petr Mladek
2022-02-18  9:00     ` David Laight
2022-02-18 12:52       ` Petr Mladek
2022-03-03 14:37     ` John Ogness
2022-02-07 19:43 ` [PATCH printk v1 10/13] printk: add kthread console printers John Ogness
2022-02-18  9:00   ` early start: was: " Petr Mladek
2022-02-18  9:04   ` start&stop: " Petr Mladek
2022-02-18  9:08   ` main loop: " Petr Mladek
2022-02-18  9:12   ` wake_up_all: " Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 11/13] printk: reimplement console_lock for proper kthread support John Ogness
2022-02-18 16:20   ` Petr Mladek
2022-02-18 21:41     ` John Ogness
2022-02-18 22:03       ` John Ogness
2022-02-22 11:42       ` Petr Mladek
2022-02-23 17:20         ` John Ogness
2022-02-24  8:27           ` Petr Mladek
2022-02-23 10:19   ` Petr Mladek
2022-03-09 13:56     ` John Ogness
2022-03-10 14:34       ` Petr Mladek
2022-03-10 16:08         ` John Ogness
2022-03-11 10:26           ` Petr Mladek
2022-03-11 13:28             ` John Ogness
2022-03-11 16:17               ` Petr Mladek
2022-03-11 22:21                 ` John Ogness
2022-03-14 14:08                   ` Petr Mladek
2022-03-14 14:43                     ` John Ogness
2022-03-14 15:53                       ` Petr Mladek
2022-03-11 18:41               ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 12/13] printk: remove @console_locked John Ogness
2022-02-23 12:17   ` Petr Mladek
2022-02-07 19:43 ` [PATCH printk v1 13/13] console: introduce CON_MIGHT_SLEEP for vt John Ogness
2022-02-23 13:37   ` Petr Mladek
2022-02-23 18:31     ` Greg Kroah-Hartman [this message]
     [not found] ` <20220208083620.2736-1-hdanton@sina.com>
2022-02-08 11:08   ` [PATCH printk v1 10/13] printk: add kthread console printers John Ogness
2022-02-08 14:53     ` Petr Mladek
2022-02-14  6:12       ` Sergey Senozhatsky
2022-02-14 10:02         ` Petr Mladek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YhZ9lHQjq7urH120@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=dankamongmen@gmail.com \
    --cc=dsterba@suse.com \
    --cc=igormtorrente@gmail.com \
    --cc=jcmvbkbc@gmail.com \
    --cc=jirislaby@kernel.org \
    --cc=john.ogness@linutronix.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=penguin-kernel@i-love.sakura.ne.jp \
    --cc=pmladek@suse.com \
    --cc=rostedt@goodmis.org \
    --cc=senozhatsky@chromium.org \
    --cc=siglesias@igalia.com \
    --cc=tglx@linutronix.de \
    --cc=unixbhaskar@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.