linux-kernel - Re: [PATCH] mm,migration: Avoid race between shift_arg_pages() and rmap_walk() during migration by not migrating temporary stacks

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Message-Id: <20100512125427.d1b170ba.akpm@linux-foundation.org>
Date:	Wed, 12 May 2010 12:54:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] mm,migration: Avoid race between shift_arg_pages() and
 rmap_walk() during migration by not migrating temporary stacks

On Wed, 12 May 2010 09:23:44 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > diff --git a/fs/exec.c b/fs/exec.c
> > index 725d7ef..13f8e7f 100644
> > --- a/fs/exec.c
> > +++ b/fs/exec.c
> > @@ -242,9 +242,10 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
> >  	 * use STACK_TOP because that can depend on attributes which aren't
> >  	 * configured yet.
> >  	 */
> > +	BUG_ON(VM_STACK_FLAGS & VM_STACK_INCOMPLETE_SETUP);
> 
> Can we use BUILD_BUG_ON()? 

That's vastly preferable - I made that change.

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