From: John Ogness <john.ogness@linutronix.de>
To: Petr Mladek <pmladek@suse.com>
Cc: "Sergey Senozhatsky" <senozhatsky@chromium.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Tony Lindgren" <tony@atomide.com>,
"Geert Uytterhoeven" <geert+renesas@glider.be>,
"Justin Chen" <justin.chen@broadcom.com>,
"Jiaqing Zhao" <jiaqing.zhao@linux.intel.com>,
linux-serial@vger.kernel.org,
"Peter Collingbourne" <pcc@google.com>
Subject: Re: [PATCH printk v2 08/26] printk: nbcon: Implement processing in port->lock wrapper
Date: Wed, 13 Mar 2024 10:55:47 +0106 [thread overview]
Message-ID: <87plvy31hg.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <87le6oy9vg.fsf@jogness.linutronix.de>
On 2024-03-11, John Ogness <john.ogness@linutronix.de> wrote:
> And I think you identified a bug relating to the setup() callback.
Actually this bug was recently fixed by Peter Collingbourne:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/kernel/printk/printk.c?h=next-20240313&id=801410b26a0e8b8a16f7915b2b55c9528b69ca87
One nice thing that has risen from this is we are starting to see
exactly what the console lock is needed for. At this point I would say
its main function is synchronizing boot consoles with real
drivers. Which means we will not be able to remove the console lock
until we find a real solution to match boot consoles (which circumvent
the Linux driver model) with the real drivers.
John
next prev parent reply other threads:[~2024-03-13 9:50 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-18 18:57 [PATCH printk v2 00/26] wire up write_atomic() printing John Ogness
2024-02-18 18:57 ` [PATCH printk v2 01/26] serial: core: Provide port lock wrappers John Ogness
2024-02-18 18:57 ` [PATCH printk v2 02/26] serial: core: Use " John Ogness
2024-02-18 18:57 ` [PATCH printk v2 03/26] serial: core: fix kernel-doc for uart_port_unlock_irqrestore() John Ogness
2024-02-18 18:57 ` [PATCH printk v2 04/26] printk: Consider nbcon boot consoles on seq init John Ogness
2024-02-20 10:26 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 05/26] printk: Add notation to console_srcu locking John Ogness
2024-02-20 10:29 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 06/26] printk: nbcon: Ensure ownership release on failed emit John Ogness
2024-02-20 15:16 ` Petr Mladek
2024-02-20 16:29 ` John Ogness
2024-02-21 13:23 ` John Ogness
2024-02-18 18:57 ` [PATCH printk v2 07/26] printk: Check printk_deferred_enter()/_exit() usage John Ogness
2024-02-21 9:55 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 08/26] printk: nbcon: Implement processing in port->lock wrapper John Ogness
2024-02-19 12:16 ` Andy Shevchenko
2024-02-19 14:18 ` John Ogness
2024-02-19 14:35 ` Andy Shevchenko
2024-02-19 16:52 ` John Ogness
2024-02-19 17:14 ` Andy Shevchenko
2024-02-23 10:51 ` Petr Mladek
2024-03-11 17:08 ` John Ogness
2024-03-13 9:49 ` John Ogness [this message]
2024-03-22 6:23 ` Tony Lindgren
2024-03-27 9:32 ` John Ogness
2024-03-27 13:12 ` Andy Shevchenko
2024-03-14 11:37 ` John Ogness
2024-03-14 14:26 ` Petr Mladek
2024-03-15 15:04 ` John Ogness
2024-03-18 15:42 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 09/26] printk: nbcon: Add detailed doc for write_atomic() John Ogness
2024-02-23 13:11 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 10/26] printk: nbcon: Fix kerneldoc for enums John Ogness
2024-02-18 19:10 ` Randy Dunlap
2024-02-23 13:13 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 11/26] printk: Make console_is_usable() available to nbcon John Ogness
2024-02-18 18:57 ` [PATCH printk v2 12/26] printk: Let console_is_usable() handle nbcon John Ogness
2024-02-18 18:57 ` [PATCH printk v2 13/26] printk: Add @flags argument for console_is_usable() John Ogness
2024-02-18 18:57 ` [PATCH printk v2 14/26] printk: nbcon: Provide function to flush using write_atomic() John Ogness
2024-02-23 15:47 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 15/26] printk: Track registered boot consoles John Ogness
2024-02-23 15:57 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 16/26] printk: nbcon: Use nbcon consoles in console_flush_all() John Ogness
2024-02-23 17:15 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 17/26] printk: nbcon: Assign priority based on CPU state John Ogness
2024-02-29 13:50 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 18/26] printk: nbcon: Add unsafe flushing on panic John Ogness
2024-02-29 13:53 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 19/26] printk: Avoid console_lock dance if no legacy or boot consoles John Ogness
2024-02-29 15:19 ` Petr Mladek
2024-02-29 16:19 ` READ_ONCE: was: " Petr Mladek
2024-02-29 22:51 ` Paul E. McKenney
2024-02-18 18:57 ` [PATCH printk v2 20/26] printk: Track nbcon consoles John Ogness
2024-03-01 9:39 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 21/26] printk: Coordinate direct printing in panic John Ogness
2024-03-01 13:05 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 22/26] printk: nbcon: Implement emergency sections John Ogness
2024-03-01 13:28 ` Petr Mladek
2024-03-01 15:49 ` flush was: " Petr Mladek
2024-03-01 16:12 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 23/26] panic: Mark emergency section in warn John Ogness
2024-03-01 13:57 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 24/26] panic: Mark emergency section in oops John Ogness
2024-03-01 14:55 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 25/26] rcu: Mark emergency section in rcu stalls John Ogness
2024-03-01 15:13 ` Petr Mladek
2024-02-18 18:57 ` [PATCH printk v2 26/26] lockdep: Mark emergency section in lockdep splats John Ogness
2024-02-19 4:14 ` Waiman Long
2024-02-19 11:11 ` John Ogness
2024-02-19 15:07 ` Waiman Long
2024-03-01 15:18 ` Petr Mladek
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