Received-SPF: pass (google.com: domain of linux-kernel+bounces-185139-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Date: Tue, 21 May 2024 17:13:15 +0200
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,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
	Waiman Long <longman@redhat.com>, Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [PATCH printk v5 30/30] lockdep: Mark emergency sections in
 lockdep splats
Message-ID: <Zky6CwR-Rycp0trp@pathway.suse.cz>
References: <20240502213839.376636-1-john.ogness@linutronix.de>
 <20240502213839.376636-31-john.ogness@linutronix.de>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240502213839.376636-31-john.ogness@linutronix.de>

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@linutronix.de>

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

Best Regards,
Petr