linux-kernel - Re: [PATCH] printk: Remove separate printk_sched buffers and use printk buf instead

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Date:	Mon, 05 May 2014 16:33:51 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>, pmladek@...e.cz,
	Jan Kara <jack@...e.cz>, Peter Zijlstra <peterz@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH] printk: Remove separate printk_sched buffers and use
 printk buf instead

On Mon, 2014-05-05 at 19:18 -0400, Steven Rostedt wrote:
> To prevent deadlocks with doing a printk inside the scheduler,
> printk_sched() was created. The issue is that printk has a console_sem
> that it can grab and release. The release does a wake up if there's a
> task pending on the sem, and this wake up grabs the rq locks that is
> held in the scheduler. This leads to a possible deadlock if the wake up
> uses the same rq as the one with the rq lock held already.
[]
>  kernel/printk/printk.c |   87 +++++++++++++++++++++++++++++++------------------
[]
> @@ -2440,18 +2470,20 @@
>  #define PRINTK_BUF_SIZE		512

Wouldn't this define be unused and shouldn't it be deleted too?


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