linux-kernel - Re: [resend][PATCH 3/4] move cred_guard_mutex from task_struct to signal

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Message-Id: <20101026220314.B7DD.A69D9226@jp.fujitsu.com>
Date:	Tue, 26 Oct 2010 22:04:50 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [resend][PATCH 3/4] move cred_guard_mutex from task_struct to signal_struct

Hello,

> > Except: I am not sure about -stable. At least, this patch should
> > not go into the <2.6.35 kernels, it relies on misc changes which
> > changed the scope of task->signal. Before 2.6.35 almost any user
> > of ->cred_guard_mutex can race with exit and hit ->signal == NULL.
> 
> I see no justification for a change like this in any -stable tree.  It's
> just a cleanup, right?  If it's a prerequisite for the fix we like for an
> "important" bug, then that's a different story.  In its own right, it's
> clearly not appropriate for backporting.

Because [4/4] depend on [3/4] and I hope to backport it. Do you dislike it
too?


Thanks.



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