linux-kernel - Re: [PATCH 2/2] sysctl: lockdep support for sysctl reference counting.

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Message-Id: <20090410021854.65c6662a.akpm@linux-foundation.org>
Date:	Fri, 10 Apr 2009 02:18:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Ingo Molnar <mingo@...e.hu>, Jan Beulich <jbeulich@...ell.com>,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, Gautham R Shenoy <ego@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexey Dobriyan <adobriyan@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] sysctl:  lockdep support for sysctl reference
 counting.

On Sat, 21 Mar 2009 00:42:19 -0700 ebiederm@...ssion.com (Eric W. Biederman) wrote:

> It is possible for get lock ordering deadlocks between locks
> and waiting for the sysctl used count to drop to zero.  We have
> recently observed one of these in the networking code.
> 
> So teach the sysctl code how to speak lockdep so the kernel
> can warn about these kinds of rare issues proactively.

`make headers_check':

/usr/src/25/usr/include/linux/sysctl.h:31: included file 'linux/lockdep.h' is not exported
make[2]: *** [/usr/src/25/usr/include/linux/.check] Error 1

It looks like we'll need version 2 on these patches..
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