linux-kernel - Re: [PATCH] mm: add config NUMA stub to all architectures

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Message-ID: <CACqU3MUOojw0pwzOpPFB9YvA=BLODe+idWkqwA7NUAm-9114Rw@mail.gmail.com>
Date:	Sun, 19 Feb 2012 18:21:26 -0500
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>, Michal Marek <mmarek@...e.cz>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] mm: add config NUMA stub to all architectures

Hi,

On Sun, Feb 19, 2012 at 1:12 PM, Randy Dunlap <rdunlap@...otime.net> wrote:
> On 02/19/2012 09:01 AM, Geert Uytterhoeven wrote:
>>
>> On Fri, Feb 17, 2012 at 21:30, Andrew Morton<akpm@...ux-foundation.org>
>>  wrote:
>>>
>>> On Fri, 17 Feb 2012 16:08:15 +0400
>>> Konstantin Khlebnikov<khlebnikov@...nvz.org>  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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