linux-kernel - Re: [PATCH 2/8] Mark sleep

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Message-ID: <20091214080452.18516dc1@infradead.org>
Date:	Mon, 14 Dec 2009 08:04:52 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, lwoodman@...hat.com,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, minchan.kim@...il.com
Subject: Re: [PATCH 2/8] Mark sleep_on as deprecated

On Mon, 14 Dec 2009 08:03:02 -0500
Christoph Hellwig <hch@...radead.org> wrote:

> On Mon, Dec 14, 2009 at 09:24:40PM +0900, KOSAKI Motohiro wrote:
> > 
> > 
> > sleep_on() function is SMP and/or kernel preemption unsafe. we
> > shouldn't use it on new code.
> 
> And the best way to archive this is to remove the function.
> 
> In Linus' current tree I find:
> 
>  - 5 instances of sleep_on(), all in old and obscure block drivers
>  - 2 instances of sleep_on_timeout(), both in old and obscure drivers 

these should both die; the sleep_on() ones using BROKEN in Kconfig..
.. sleep_on() has not worked in the 2.6 series ever.... ;)


>  
>  - 28 instances of interruptible_sleep_on_timeout(), mostly in obscure
>    drivers with a high concentration in the old oss core which should
> be killed anyway.  And unfortunately a few relatively recent additions
>    like the SGI xpc driver or usbvision driver

can we also make sure that checkpatch.pl catches any new addition?
(not saying checkpatch.pl is the end-all, but the people who do run it
at least have now have a chance ;-)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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