linux-kernel - Re: [PATCH 1/3] futex_find_get_task: remove an obscure EXIT

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Date:	Tue, 22 Aug 2006 23:10:37 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...l.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] futex_find_get_task: remove an obscure EXIT_ZOMBIE check

On 08/22, Ingo Molnar wrote:
> 
> * Oleg Nesterov <oleg@...sign.ru> wrote:
> 
> > (Compile tested).
> > 
> > futex_find_get_task:
> > 
> > 	if (p->state == EXIT_ZOMBIE || p->exit_state == EXIT_ZOMBIE)
> > 		return NULL;
> > 
> > I can't understand this. First, p->state can't be EXIT_ZOMBIE. The 
> > ->exit_state check looks strange too. Sub-threads or tasks whose 
> > ->parent ignores SIGCHLD go directly to EXIT_DEAD state (I am ignoring 
> > a ptrace case). Why EXIT_DEAD tasks should be ok? Yes, EXIT_ZOMBIE is 
> > more important (a task may stay zombie for a long time), but this 
> > doesn't mean we should explicitely ignore other EXIT_XXX states.
> > 
> > Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
> 
> i believe this is a remnant of older times when EXIT_ZOMBIE was 
> introduced. We cloned that into the -rt tree, but then exit-state got 
> cleaned up (by you)

No, no, it was Roland.

But probably you are talking about these patches

	http://marc.theaimsgroup.com/?t=113284375800003&r=1
	http://marc.theaimsgroup.com/?t=113284375800005&r=1

? It was abandoned by Linus. It is not clear was he convinced or not,
but I'd be happy to re-send this patch (on weekend) if you wish.

Oleg.

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