All of lore.kernel.org
 help / color / mirror / Atom feed
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>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Uros Bizjak <ubizjak@gmail.com>,
	"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
	Lukas Wunner <lukas@wunner.de>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH printk v2 18/26] printk: nbcon: Add unsafe flushing on panic
Date: Thu, 29 Feb 2024 14:53:35 +0100	[thread overview]
Message-ID: <ZeCMX2udjcxGLDtd@alley> (raw)
In-Reply-To: <20240218185726.1994771-19-john.ogness@linutronix.de>

On Sun 2024-02-18 20:03:18, John Ogness wrote:
> Add nbcon_atomic_flush_unsafe() to flush all nbcon consoles
> using the write_atomic() callback and allowing unsafe hostile
> takeovers. Call this at the end of panic() as a final attempt
> to flush any pending messages.
> 
> Note that legacy consoles use unsafe methods for flushing
> from the beginning of panic (see bust_spinlocks()). Therefore,
> systems using both legacy and nbcon consoles may still fail to
> see panic messages due to unsafe legacy console usage.
> 
> Signed-off-by: John Ogness <john.ogness@linutronix.de>

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

  reply	other threads:[~2024-02-29 13:53 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
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 [this message]
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

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=ZeCMX2udjcxGLDtd@alley \
    --to=pmladek@suse.com \
    --cc=akpm@linux-foundation.org \
    --cc=arnd@arndb.de \
    --cc=gpiccoli@igalia.com \
    --cc=john.ogness@linutronix.de \
    --cc=jpoimboe@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lukas@wunner.de \
    --cc=peterz@infradead.org \
    --cc=rostedt@goodmis.org \
    --cc=senozhatsky@chromium.org \
    --cc=tglx@linutronix.de \
    --cc=ubizjak@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.