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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/