linux-kernel - Re: [PATCH] migration: migrate

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Message-Id: <20090129101623.0d64d81b.nishimura@mxp.nes.nec.co.jp>
Date:	Thu, 29 Jan 2009 10:16:23 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, nishimura@....nes.nec.co.jp
Subject: Re: [PATCH] migration: migrate_vmas should check "vma"

On Wed, 28 Jan 2009 17:55:12 +0100, Johannes Weiner <hannes@...xchg.org> wrote:
> On Wed, Jan 28, 2009 at 11:42:36AM -0500, Christoph Lameter wrote:
> > On Wed, 28 Jan 2009, Daisuke Nishimura wrote:
> > 
> > > migrate_vmas() should check "vma" not "vma->vm_next" for for-loop condition.
> > 
> > The loop condition is checked before vma = vma->vm_next. So the last
> > iteration of the loop will now be run with vma = NULL?
> 
> No, the condition is always checked before the body is executed.  The
> assignment to vma->vm_next happens at the end of every body.
> 
So, I think in current code the loop body is not executed
about the last vma in the list.


Thanks,
Daisuke Nishimura.

> Try this:
> 
> 		int a = 2;
> 
> 		for (puts("init"); puts("cond"), a; puts("next"))
> 			a--;
> 
> 	Hannes
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