linux-kernel - Re: [PATCH 2/3] futex_find_get_task: don't take tasklist

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Message-ID: <20060822104446.GB28183@elte.hu>
Date:	Tue, 22 Aug 2006 12:44:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] futex_find_get_task: don't take tasklist_lock


* Oleg Nesterov <oleg@...sign.ru> wrote:

> It is ok to do find_task_by_pid() + get_task_struct() under 
> rcu_read_lock(), we cand drop tasklist_lock.
> 
> Note that testing of ->exit_state is racy with or without tasklist 
> anyway.
> 
> Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

yeah. (We did this in the -rt tree for some time too, never saw any 
problems.)

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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