linux-kernel - Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG

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Date:	Thu, 18 Mar 2010 08:56:23 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove

> 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.



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