linux-kernel - Re: [RFC][PATCH 2/4] Revert Changes to kernel/workqueue.c

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Message-ID: <20060824105100.GA6868@osiris.boeblingen.de.ibm.com>
Date:	Thu, 24 Aug 2006 12:51:00 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	rusty@...tcorp.com.au, torvalds@...l.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, arjan@...el.linux.com, mingo@...e.hu,
	davej@...hat.com, vatsa@...ibm.com, dipankar@...ibm.com,
	ashok.raj@...el.com
Subject: Re: [RFC][PATCH 2/4] Revert Changes to kernel/workqueue.c

> @@ -510,13 +515,11 @@ int schedule_on_each_cpu(void (*func)(vo
>  	if (!works)
>  		return -ENOMEM;
>  
> -	mutex_lock(&workqueue_mutex);
>  	for_each_online_cpu(cpu) {
>  		INIT_WORK(per_cpu_ptr(works, cpu), func, info);
>  		__queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
>  				per_cpu_ptr(works, cpu));
>  	}
> -	mutex_unlock(&workqueue_mutex);
>  	flush_workqueue(keventd_wq);
>  	free_percpu(works);
>  	return 0;

Removing this lock without adding a lock/unlock_cpu_hotplug seems wrong,
since this function is walking the cpu_online_map.
-
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