linux-kernel - Re: whence CONFIG_PROVE_SPIN

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Date:	Sun, 18 Mar 2007 22:42:21 +0100
From:	Denis Vlasenko <vda.linux@...glemail.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	Jiri Kosina <jikos@...os.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: whence CONFIG_PROVE_SPIN_LOCKING?

Hi,

On Sunday 18 March 2007 22:06, Robert P. J. Day wrote:
> p.s.  just FYI, i ran my "find dead CONFIG variables" script on the
> entire tree and, as we speak, there are 316 preprocessor tests that
> are testing variables of the form "CONFIG_whatever" for which that
> option is not set anywhere in the tree.  (that is, 316 distinct
> variables, not just 316 distinct tests.)  see the attached script and
> feel free to run it from the top of the tree on your favourite
> directory or sub-directory.

In busybox project we adopted the usage of -Wundef
and we try to minimize usage of #ifdef CONFIG_xxx - each boolean
CONFIG_xxx option for busybox is accompanied with
ENABLE_xxx #define which is 1 or 0, never "undefined",
and we check it instead of CONFIG_xxx.

Because if -Wundef, gcc complains whenever we use #if
on undefined ENABLE_xxx.
--
vda
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