linux-kernel - Re: lockdep trace from posix timers

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Message-ID: <20120821183408.GA11721@redhat.com>
Date:	Tue, 21 Aug 2012 20:34:08 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 08/21, Oleg Nesterov wrote:
>
> static inline bool cmp_xchg(struct callback_head **ptr, void *old, void *new)
> {
> 	return cmpxchg(ptr, old, new) == old;
> }
>
> int
> task_work_add(struct task_struct *task, struct callback_head *twork, bool notify)
> {
> 	do {
> 		twork->next = ACCESS_ONCE(task->task_works);
> 		if (unlikely(twork->next == TWORK_EXITED))
> 			return -ESRCH;
> 	} while (cmp_xchg(&task->task_works, twork->next, twork));
          ^^^^^^^^^^^^^^^

while (!cmp_xchg(...))

Oleg.

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