From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Jani Nikula <jani.nikula@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ryo Takakura <takakura@valinux.co.jp>,
Joel Granados <j.granados@samsung.com>,
Lukas Wunner <lukas@wunner.de>, Uros Bizjak <ubizjak@gmail.com>
Subject: Re: [PATCH printk v8 29/35] printk: Coordinate direct printing in panic
Date: Tue, 20 Aug 2024 17:21:29 +0200 [thread overview]
Message-ID: <ZsS0efABGgFmXBwB@pathway.suse.cz> (raw)
In-Reply-To: <20240820063001.36405-30-john.ogness@linutronix.de>
On Tue 2024-08-20 08:35:55, John Ogness wrote:
> If legacy and nbcon consoles are registered and the nbcon
> consoles are allowed to flush (i.e. no boot consoles
> registered), the legacy consoles will no longer perform
> direct printing on the panic CPU until after the backtrace
> has been stored. This will give the safe nbcon consoles a
> chance to print the panic messages before allowing the
> unsafe legacy consoles to print.
>
> If no nbcon consoles are registered or they are not allowed
> to flush because boot consoles are registered, there is no
> change in behavior (i.e. legacy consoles will always attempt
> to print from the printk() caller context).
>
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Best Regards,
Petr
next prev parent reply other threads:[~2024-08-20 15:21 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 6:29 [PATCH printk v8 00/35] wire up write_atomic() printing John Ogness
2024-08-20 6:29 ` [PATCH printk v8 01/35] printk: Add notation to console_srcu locking John Ogness
2024-08-20 17:49 ` Paul E. McKenney
2024-09-09 17:28 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 02/35] printk: nbcon: Consolidate alloc() and init() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 03/35] printk: Properly deal with nbcon consoles on seq init John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Petr Mladek
2024-08-20 6:29 ` [PATCH printk v8 04/35] printk: Check printk_deferred_enter()/_exit() usage John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Sebastian Andrzej Siewior
2024-08-20 6:29 ` [PATCH printk v8 05/35] printk: nbcon: Clarify rules of the owner/waiter matching John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 06/35] printk: nbcon: Remove return value for write_atomic() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 07/35] printk: nbcon: Add detailed doc " John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 08/35] printk: nbcon: Add callbacks to synchronize with driver John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 09/35] printk: nbcon: Use driver synchronization while (un)registering John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 10/35] serial: core: Provide low-level functions to lock port John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 11/35] serial: core: Introduce wrapper to set @uart_port->cons John Ogness
2024-08-20 11:12 ` Ilpo Järvinen
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 12/35] console: Improve console_srcu_read_flags() comments John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 13/35] nbcon: Add API to acquire context for non-printing operations John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 14/35] serial: core: Acquire nbcon context in port->lock wrapper John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 15/35] printk: nbcon: Do not rely on proxy headers John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 16/35] printk: Make console_is_usable() available to nbcon.c John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 17/35] printk: Let console_is_usable() handle nbcon John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 18/35] printk: Add @flags argument for console_is_usable() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 19/35] printk: nbcon: Add helper to assign priority based on CPU state John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 20/35] printk: nbcon: Provide function to flush using write_atomic() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Thomas Gleixner
2024-08-20 6:29 ` [PATCH printk v8 21/35] printk: Track registered boot consoles John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 22/35] printk: nbcon: Use nbcon consoles in console_flush_all() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 23/35] printk: Add is_printk_legacy_deferred() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 24/35] printk: nbcon: Flush new records on device_release() John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 25/35] printk: Flush nbcon consoles first on panic John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 26/35] printk: nbcon: Add unsafe flushing " John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 27/35] printk: Avoid console_lock dance if no legacy or boot consoles John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 28/35] printk: Track nbcon consoles John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 29/35] printk: Coordinate direct printing in panic John Ogness
2024-08-20 15:21 ` Petr Mladek [this message]
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 30/35] printk: Add helper for flush type logic John Ogness
2024-08-21 9:11 ` Petr Mladek
2024-08-23 5:25 ` John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:29 ` [PATCH printk v8 31/35] printk: nbcon: Implement emergency sections John Ogness
2024-08-27 14:19 ` John Ogness
2024-09-04 10:34 ` Petr Mladek
2024-09-09 17:27 ` [tip: sched/rt] printk: nbcon: Use raw_cpu_ptr() instead of open coding tip-bot2 for John Ogness
2024-09-09 17:27 ` [tip: sched/rt] printk: nbcon: Implement emergency sections tip-bot2 for Thomas Gleixner
2024-08-20 6:29 ` [PATCH printk v8 32/35] panic: Mark emergency section in warn John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Thomas Gleixner
2024-08-20 6:29 ` [PATCH printk v8 33/35] panic: Mark emergency section in oops John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:30 ` [PATCH printk v8 34/35] rcu: Mark emergency sections in rcu stalls John Ogness
2024-08-20 17:48 ` Paul E. McKenney
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-20 6:30 ` [PATCH printk v8 35/35] lockdep: Mark emergency sections in lockdep splats John Ogness
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for John Ogness
2024-08-21 9:21 ` [PATCH printk v8 00/35] wire up write_atomic() printing Petr Mladek
2024-08-21 9:28 ` Sebastian Andrzej Siewior
2024-08-21 14:09 ` Petr Mladek
2024-08-21 14:20 ` Sebastian Andrzej Siewior
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