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

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Message-ID: <4F42579F.5070701@suse.cz>
Date:	Mon, 20 Feb 2012 15:24:31 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	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>, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] mm: add config NUMA stub to all architectures

On 20.2.2012 00:21, Arnaud Lacombe wrote:
> 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:
>>>> 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 :/

Having a single namespace, or less ambitiously, having less
arch-specific config symbol definitions, would be a plus. IS_ENABLED
requiring the symbol to be defined is not bad per se, it prevents typos.

Michal
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