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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove
Cc: kosaki.motohiro@jp.fujitsu.com, Mel Gorman <mel@csn.ul.ie>,
       Andrew Morton <akpm@linux-foundation.org>,
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       linux-mm@kvack.org
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> On Wed, 17 Mar 2010, Mel Gorman wrote:
> 
> > > If select MIGRATION works, we can remove "depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE"
> > > line from config MIGRATION.
> > >
> >
> > I'm not quite getting why this would be an advantage. COMPACTION
> > requires MIGRATION but conceivable both NUMA and HOTREMOVE can work
> > without it.
> 
> Avoids having to add additional CONFIG_XXX on the page migration "depends"
> line in the future.

Yes, Kconfig mess freqently shot ourself in past days. if we have a chance
to remove unnecessary dependency, we should do. that's my intention of the last mail.