linux-kernel - Re: [Patch v2] sysfs: add lockdep class support to s

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Date:	Fri, 05 Feb 2010 01:01:47 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Miles Lane <miles.lane@...il.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	akpm@...ux-foundation.org
Subject: Re: [Patch v2] sysfs: add lockdep class support to s_active

Amerigo Wang <amwang@...hat.com> writes:

> Recently we met a lockdep warning from sysfs during s2ram or cpu hotplug.
> As reported by several people, it is something like:

The interesting case is the cpu hotplug is actually a problem.  It isn't
useful to get a complaint about the non-problems code paths triggered
by pm.  However my earlier review spotted a real deadlock case.  Where
in one of the sysfs attributes we iterate over the list of online cpus
and that appeared to an attribute that removing a cpu would remove
from sysfs...

Eric
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