linux-kernel - Re: [PATCH 2/2] time: xtime lock vs printk

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Message-Id: <1206368515.10894.246.camel@localhost.localdomain>
Date:	Mon, 24 Mar 2008 07:21:55 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] time: xtime lock vs printk


On Mon, 2008-03-24 at 13:24 +0100, Peter Zijlstra wrote:
> -       printk(KERN_INFO "Time: %s clocksource has been installed.\n",
> +       /*
> +        * We're holding xtime lock and waking up klogd would deadlock
> +        * us on enqueue. Print without waking.
> +        */
> +       printk_nowakeup(KERN_INFO "Time: %s clocksource has been
> installed.\n",
>                clock->name);

It doesn't seem like there is a lot of potential for more xtime write
lock holders to do printk's .. We could just remove this line, or move
this printk into an __init ..

Daniel

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