linux-kernel - Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

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Message-ID: <20070214202316.GD301@tv-sign.ru>
Date:	Wed, 14 Feb 2007 23:23:16 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	Gautham R Shenoy <ego@...ibm.com>, akpm@...l.org,
	paulmck@...ibm.com, mingo@...e.hu, dipankar@...ibm.com,
	venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org,
	rjw@...k.pl
Subject: Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

On 02/14, Srivatsa Vaddagiri wrote:
>
> On Wed, Feb 14, 2007 at 08:13:05PM +0530, Gautham R Shenoy wrote:
> > +	switch (action) {
> > +	case CPU_UP_PREPARE:
> > +		/* Create a new workqueue thread for it. */
> > +		list_for_each_entry(wq, &workqueues, list) {
> 
> Its probably safe to take the workqueue (spin) lock here (and other
> notifiers as well), before traversing the list.

We can't fork() under spin lock.

> 
> > +			cwq = per_cpu_ptr(wq->cpu_wq, hotcpu);
> > +			if (create_workqueue_thread(cwq, hotcpu)) {
> > +				printk("workqueue for %i failed\n", hotcpu);
> > +				return NOTIFY_BAD;
> > +			}
> > +		}
> > +		break;

Oleg.

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