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

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Date:	Mon, 21 Aug 2006 17:01:10 -0700
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: [PATCH 1/3] futex_find_get_task: remove an obscure EXIT_ZOMBIE check

On Mon, Aug 21, 2006 at 09:06:04PM +0400, Oleg Nesterov 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.

The p->state variable for EXIT_ZOMBIE is only live for some mystery architecture
in arch/xtensa/kernel/ptrace.c

It could be a typo under architecture so maybe it's better fixed there as well
with a "state" to "exit_state" change. I don't really know for sure since I don't
work under that architecure.

bill


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