linux-kernel - Re: Should we use preempt_disable() in sleep_on

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Message-ID: <20091203071244.GI9121@core.coreip.homeip.net>
Date:	Wed, 2 Dec 2009 23:12:44 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	liu pf <kernelfans@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Should we use preempt_disable() in sleep_on_common()?

On Wed, Dec 02, 2009 at 11:07:46PM -0800, Arjan van de Ven wrote:
> On Thu, 3 Dec 2009 14:49:14 +0800
> liu pf <kernelfans@...il.com> wrote:
> 
> > Hi:
> > 
> > I am puzzled with the following scenario. Could anyone enlighten me?
> 
> 
> sleep_on family of APIs is very racy and just cannot be used correctly;
> I'm not surprised that there's a preempt race in it, but trust me, it's
> not the biggest race... never ever use these APIs!!!
> 
> 

BTW, why do we still have them? I checked couple and they don't seem to
be used...

-- 
Dmitry
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