linux-kernel - Re: [PATCH 8/8] job control: Don't send duplicate job control stop notification while ptraced

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Date:	Mon, 21 Mar 2011 18:48:45 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	roland@...hat.com, jan.kratochvil@...hat.com,
	vda.linux@...glemail.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	indan@....nu
Subject: Re: [PATCH 8/8] job control: Don't send duplicate job control stop
	notification while ptraced

On 03/08, Tejun Heo wrote:
>
>  static bool task_participate_group_stop(struct task_struct *task)
>  {
> @@ -284,7 +288,11 @@ static bool task_participate_group_stop(struct task_struct *task)
>  	if (!WARN_ON_ONCE(sig->group_stop_count == 0))
>  		sig->group_stop_count--;
>  
> -	if (!sig->group_stop_count) {
> +	/*
> +	 * Tell the caller to notify completion iff we are entering into a
> +	 * fresh group stop.  Read comment in do_signal_stop() for details.
> +	 */
> +	if (!sig->group_stop_count && !(sig->flags & SIGNAL_STOP_STOPPED)) {
>  		sig->flags = SIGNAL_STOP_STOPPED;
>  		return true;

Ah, indeed. And this fixes the problems with the extra notification I
mentioned when I was looking at 1/8.

Oleg.

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