linux-kernel - Re: [PATCH] signal, procfs: lock_task_sighand() do not need rcu_read

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Date:	Sun, 5 Oct 2008 00:55:22 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Oleg Nesterov <oleg@...sign.ru>,
	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] signal, procfs: lock_task_sighand() do not need
	rcu_read_lock()

On Fri, Oct 03, 2008 at 08:29:15PM +0400, Oleg Nesterov wrote:
> On 10/03, Lai Jiangshan wrote:
> >
> > lock_task_sighand() make sure task->sighand is being protected,
> > so we do not need rcu_read_lock().
> > [ exec() will get task->sighand->siglock before change task->sighand! ]
> >
> > But code using rcu_read_lock() _just_ to protect lock_task_sighand()
> > only appear in procfs. (and some code in procfs use lock_task_sighand()
> > without such redundant protection.)
> 
> Yes, the patch looks correct.

Yeah, applied to proc.git
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