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Date: Wed, 30 Aug 2006 08:05:18 -0700
From: Andrew Morton <akpm@osdl.org>
To: David Howells <dhowells@redhat.com>
Cc: torvalds@osdl.org, linux-kernel@vger.kernel.org, uclinux-dev@uclinux.org
Subject: Re: [PATCH 1/2] NOMMU: Set BDI capabilities for /dev/mem and
 /dev/kmem
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On Wed, 30 Aug 2006 09:38:42 +0100
David Howells <dhowells@redhat.com> wrote:

> > Or you could use the approach I suggested, like wot everyone else does.
> 
> Ummm...  I don't recall ever coming across a construct like that in the
> kernel.

box:/usr/src/linux-2.6.18-rc5> grep -r '^#define.*suspend[      ]*NULL' . | wc -l
75

We do it to reduce (and to localise) ifdefs.