linux-kernel - Re: 2.6.33-rc3 -- INFO: possible recursive locking -- (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and

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Message-ID: <1263460380.4244.285.camel@laptop>
Date:	Thu, 14 Jan 2010 10:13:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Miles Lane <miles.lane@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Américo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...hat.com>
Subject: Re: 2.6.33-rc3 -- INFO: possible recursive locking -- 
 (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and_remove+0x3d/0x4f

On Wed, 2010-01-13 at 19:09 -0800, Eric W. Biederman wrote:
> 
> I agree weird.  Either you don't have my patch working correctly or I
> talk a good good game but I don't have a clue about lockdep
> subclasses.

Subclasses and classes are basically the same thing, except that
subclasses are an 'easy' way to modify the regular class of an object.

Subclasses are limited to 7, 0 (the regular class), 1-7 subclasses.

Subclasses (just like regular classes) have no intrinsic ordering, their
order is given by the lock hierarchy.

Anything else you want to know?

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