linux-kernel - Re: Fw: [PATCH -mm] workqueue: debug possible endless loop in cancel_rearming_delayed

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Message-ID: <20070425122814.GF1613@ff.dom.local>
Date:	Wed, 25 Apr 2007 14:28:14 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>
Subject: Re: Fw: [PATCH -mm] workqueue: debug possible endless loop in cancel_rearming_delayed_work

On Wed, Apr 25, 2007 at 02:20:38PM +0200, Jarek Poplawski wrote:
> 2 cents more...
... 
> On Tue, Apr 24, 2007 at 10:55:37PM +0400, Oleg Nesterov wrote:
> > +	do {
> > +		retry = 1;

Of course this'll be shorter:

		retry = 0;

> > +		spin_lock_irq(&cwq->lock);
> > +		/* CPU_DEAD in progress may change cwq */
> > +		if (likely(cwq == get_wq_data(work))) {
> > +			list_del_init(&work->entry);
> > +			__set_bit(WORK_STRUCT_PENDING, work_data_bits(work));
> > +			retry = try_to_del_timer_sync(&dwork->timer) < 0;
> > +		}
> > +		spin_unlock_irq(&cwq->lock);
> > +	} while (unlikely(retry));
...

Jarek P.
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