Re: [PATCH] migration: migrate_vmas should check "vma"

[Johannes Weiner]

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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