From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] arch: configuration,
 deleting 'CONFIG_BUG' since always need it.
Date: Tue, 28 May 2013 09:06:48 -0700
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To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: Linux-sh list <linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Catalin Marinas <Catalin.Marinas-5wv7dgnIgG8@public.gmane.org>, Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>, Chen Gang <gang.chen-bOixZGp5f+dBDgjK7y7TUQ@public.gmane.org>, Heiko Carstens <heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>, "paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org" <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, Michel Lespinasse <walken-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Hans-Christian Egtvedt <egtvedt-BrfabpQBY5qlHtIdYg32fQ@public.gmane.org>, Linux-Arch <linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>, Yoshinori Sato <ysato-Rn4VEauK+AKRv+LV9MX5uooqe+aC9MnS@public.gmane.org>, Richard Weinberger <richard-/L3Ra7n9ekc@public.gmane.org>, Helge Deller <deller-Mmb7MZpHnFY@public.gmane.org>, the arch/x86 maintainers <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "James E.J. Bottomley" <jejb-6jwH94ZQLHl74goWV3ctuw@public.gmane.org>, "mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org" <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
List-Id: linux-arch.vger.kernel.org

On 05/28/2013 08:43 AM, Arnd Bergmann wrote:
> 
> Right, that is what the patch I just posted does.
> 
> On a related note, I found that WARN_ON() can no longer be compiled
> out since there is already code that relies on the side-effects of
> the condition. I assume that was an intentional change I missed,
> since it used to be defined so that you could remove it completely.
> 

It is possible to define WARN_ON() as:

#define WARN_ON(x) ((void)(x))

... which preserves side effects.

	-hpa