linux-kernel - Re: 2.6.28-rc2-mm1: possible circular locking

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Message-ID: <20081029145446.081141b4@infradead.org>
Date:	Wed, 29 Oct 2008 14:54:46 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>, linux-mm@...ck.org
Subject: Re: 2.6.28-rc2-mm1: possible circular locking

On Wed, 29 Oct 2008 13:58:40 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> We've been calling schedule_on_each_cpu() from within
> lru_add_drain_all() for ages.  What changed to cause all this
> to start happening?

what started to get these out of the weed is that copy_*_user() is now
annotated to (potentially) take the mmap sem (which it does if there's
a fault)... 
previously you had to actually fault to get the lock dependency noticed.

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