linux-kernel - Re: [PATCH printk v5 30/30] lockdep: Mark emergency sections in lockdep splats

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Message-ID: <Zky6CwR-Rycp0trp@pathway.suse.cz>
Date: Tue, 21 May 2024 17:13:15 +0200
From: Petr Mladek <pmladek@...e.com>
To: John Ogness <john.ogness@...utronix.de>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH printk v5 30/30] lockdep: Mark emergency sections in
 lockdep splats

On Thu 2024-05-02 23:44:39, John Ogness wrote:
> Mark emergency sections wherever multiple lines of
> lock debugging output are generated. In an emergency
> section the CPU will not perform console output for the
> printk() calls. Instead, a flushing of the console
> output is triggered when exiting the emergency section.
> This allows the full message block to be stored as
> quickly as possible in the ringbuffer.
> 
> Note that debug_show_all_locks() and
> lockdep_print_held_locks() rely on their callers to
> enter the emergency section. This is because these
> functions can also be called in non-emergency
> situations (such as sysrq).
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

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

Best Regards,
Petr