linux-kernel - Re: [PATCH v1 3/8] sched/completion: convert completions to use simple wait queues

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Date:	Wed, 9 Sep 2015 16:26:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/8] sched/completion: convert completions to use
 simple wait queues

On Wed, Sep 09, 2015 at 02:05:29PM +0200, Daniel Wagner wrote:
> @@ -50,10 +50,10 @@ void complete_all(struct completion *x)
>  {
>  	unsigned long flags;
>  
> -	spin_lock_irqsave(&x->wait.lock, flags);
> +	raw_spin_lock_irqsave(&x->wait.lock, flags);
>  	x->done += UINT_MAX/2;
> -	__wake_up_locked(&x->wait, TASK_NORMAL, 0);
> -	spin_unlock_irqrestore(&x->wait.lock, flags);
> +	swake_up_locked(&x->wait);
> +	raw_spin_unlock_irqrestore(&x->wait.lock, flags);
>  }
>  EXPORT_SYMBOL(complete_all);

I don't think that's correct; __wake_up_locked(.nr=0) would wake all
waiters, where swake_up_locked() will only wake one.
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