linux-kernel - Re: lockdep trace from posix timers

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Message-ID: <1345446957.23018.14.camel@twins>
Date:	Mon, 20 Aug 2012 09:15:57 +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 Fri, 2012-08-17 at 17:14 +0200, Oleg Nesterov wrote:
> I still think that task_work_add() should synhronize with exit_task_work()
> itself and fail if necessary. But I wasn't able to convince Al ;)

I'm not at all sure how that relates to needing task_lock() in the
keyctl stuff.

Also, can't task_work use llist stuff? That would also avoid using
->pi_lock.
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