linux-kernel - Re: 2.6.25-rc9 -- INFO: possible circular locking dependency detected

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Date:	Mon, 14 Apr 2008 09:18:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Gautham Shenoy <ego@...ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: 2.6.25-rc9 -- INFO: possible circular locking dependency
	detected


* Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> On Mon, Apr 14, 2008 at 08:54:05AM +0200, Peter Zijlstra wrote:
> > Fun,
> > 
> > I will need to sort out this code before I can say anything about that,
> > perhaps Gautham and or Rafael have ideas before I can come up with
> > something.. ?
> 
> Why not simply removing the get/put_online_cpus() pair in 
> sched_getaffinity? It's superfluous since we have already a 
> read_lock/read_unlock pair there which does disable/enable cpu hotplug 
> anyway.

we dont want to insert such silent "preempt off == hotplug disable" 
assumptions - which assumption breaks when the tasklist_lock becomes 
preemptible (such as in -rt).

	Ingo
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