linux-kernel - Re: [GIT PULL] printk: Support for full dynticks mode

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Date:	Tue, 5 Feb 2013 04:19:05 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] printk: Support for full dynticks mode

2013/2/5 Steven Rostedt <rostedt@...dmis.org>:
> On Mon, 2013-02-04 at 18:09 -0800, Andrew Morton wrote:
>
>> Maybe there were other deadlock scenarios, dunno.  That knowledge
>> appears to be disappearing into the mists of time :(
>
> Discussing this on IRC with Frederic, he brought up that the
> up(&console_sem) can do a wake_up as well. I guess that's the issue we
> have :-/

Also if we delay the wakeup on klogd but not on the console_sem
waiters, it looks like a general printk() problem. Not something that
only printk_sched() would like to avoid.
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