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

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Message-ID: <20091202230746.611f7fc5@infradead.org>
Date:	Wed, 2 Dec 2009 23:07:46 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	liu pf <kernelfans@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Should we use preempt_disable() in sleep_on_common()?

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!!!

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
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