Subject: Re: [PATCH] mm: add config NUMA stub to all architectures

From: Andrew Morton <[email-masked]>
Date: Fri, 17 Feb 2012 12:30:37 -0800

On Fri, 17 Feb 2012 16:08:15 +0400
Konstantin Khlebnikov <[email-masked]> 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.