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Date:	Sun, 19 Feb 2012 18:21:26 -0500
From:	Arnaud Lacombe <>
To:	Randy Dunlap <>
Cc:	Geert Uytterhoeven <>,
	Andrew Morton <>,
	Konstantin Khlebnikov <>,
	Stephen Rothwell <>,, LKML <>,
	Sam Ravnborg <>, Michal Marek <>,
Subject: Re: [PATCH] mm: add config NUMA stub to all architectures


On Sun, Feb 19, 2012 at 1:12 PM, Randy Dunlap <> wrote:
> On 02/19/2012 09:01 AM, Geert Uytterhoeven wrote:
>> On Fri, Feb 17, 2012 at 21:30, Andrew Morton<>
>>  wrote:
>>> On Fri, 17 Feb 2012 16:08:15 +0400
>>> Konstantin Khlebnikov<>  wrote:
>>>> Config NUMA must be defined for all architectures,
>>>> otherwise IS_ENABLED(CONFIG_NUMA) does not work.
>>>> Some arch-specific Kconfig already has this stub.
>>>> This patch adds it to all remaining.
>>> It would be better to teach IS_ENABLED() to handle this situation.  I
>>> don't think there's a way of doing this with cpp :(
>>> This limitation makes IS_ENABLED pretty dangerous, doesn't it?  It
>>> makes it very easy to introduce build breakage with unexpected Kconfig
>>> combinations.
>> Indeed. Recently I discovered IS_ENABLED() and started recommending it
>> to people for new code. But now I've seen the CONFIG_NUMA breakage,
>> I no longer think this is a good recommendation.
> adding Michal & linux-kbuild to cc: list.
I do not really see any way to fix this, beside having a unique
architecture-wide configuration namespace :/

 - Arnaud
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