linux-kernel - Re: [PATCH 0/7] convert semaphore to mutex in struct class

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Message-ID: <20080103072404.GB1677@ff.dom.local>
Date:	Thu, 3 Jan 2008 08:24:04 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	gregkh@...e.de, stern@...land.harvard.edu, peterz@...radead.org,
	david-b@...bell.net, davem@...emloft.net, krh@...hat.com,
	stefanr@...6.in-berlin.de, dbrownell@...rs.sourceforge.net,
	James.Bottomley@...senPartnership.com, a.zummo@...ertech.it,
	cbou@...l.ru, dwmw2@...radead.org, khali@...ux-fr.org,
	i2c@...sensors.org, linux1394-devel@...ts.sourceforge.net,
	spi-devel-general@...ts.sourceforge.net,
	linux-scsi@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] convert semaphore to mutex in struct class

On Thu, Jan 03, 2008 at 08:06:09AM +0100, Jarek Poplawski wrote:
> On Thu, Jan 03, 2008 at 01:50:20PM +0800, Dave Young wrote:
> > Convert semaphore to mutex in struct class.
> ...
> > One lockdep warning detected as following, thus use mutex_lock_nested with SINGLE_DEPTH_NESTING in class_device_add
> > 
> > Jan  3 10:45:15 darkstar kernel: =============================================
> > Jan  3 10:45:15 darkstar kernel: [ INFO: possible recursive locking detected ]
> > Jan  3 10:45:15 darkstar kernel: 2.6.24-rc6-mm1-mutex #1
> > Jan  3 10:45:15 darkstar kernel: ---------------------------------------------
> ...
> > If there's anything missed please help to point out, thanks.
> 
> Dave, IMHO it's not 'the right' way to do it: [...]

OOPS! (I was sleeping...) Unless it has turned out it's not so hard
here, and you are quite sure there should be no more warnings after
this one nesting annotation - then of course, this is the right way!

Sorry (?)
Jarek P.
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