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

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Message-ID: <20090128165512.GA22588@cmpxchg.org>
Date:	Wed, 28 Jan 2009 17:55:12 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] migration: migrate_vmas should check "vma"

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.

Try this:

		int a = 2;

		for (puts("init"); puts("cond"), a; puts("next"))
			a--;

	Hannes
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