linux-kernel - Re: lockdep trace from posix timers

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Message-ID: <1345463210.23018.36.camel@twins>
Date:	Mon, 20 Aug 2012 13:46:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	rostedt <rostedt@...dmis.org>, dhowells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: lockdep trace from posix timers

On Mon, 2012-08-20 at 13:44 +0200, Peter Zijlstra wrote:
> > I'm not at all sure how that relates to needing task_lock() in the
> > keyctl stuff. 

Ah, is it used to serialize against exit_mm() so that the !->mm check
will suffice to avoid queuing works past exit_task_work() ?



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