linux-kernel - Re: [PATCH] Fix check after use in kernel/exit.c

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Message-ID: <20080309114844.GC30331@elte.hu>
Date:	Sun, 9 Mar 2008 12:48:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org, gvaughan@....nasa.gov, akpm@...l.org,
	jeremy@...p.org
Subject: Re: [PATCH] Fix check after use in kernel/exit.c


* WANG Cong <xiyou.wangcong@...il.com> wrote:

> > actually, i unapplied it again because the patch is wrong: 
> > mm_release() has side-effects for kernel threads such as the 
> > deactivate_mm() [which is important even if the user-mm is NULL]. If 
> > the NULL mm dereference can really trigger then it should be avoided 
> > within mm_release().
> 
> Do you mean that the NULL check should be moved into mm_release()?

yes - we need to run deactivate_mm() for kernel threads.

	Ingo
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