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From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 23 May 2013 10:54:10 +0200
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Subject: Re: [PATCH] arch: configuration, deleting 'CONFIG_BUG' since always need it.
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Chen Gang <gang.chen@asianux.com>, Russell King - ARM Linux <linux@arm.linux.org.uk>, =?utf-8?q?H=C3=A5vard_Skinnemoen?= <hskinnemoen@gmail.com>, Hans-Christian Egtvedt <egtvedt@samfundet.no>, Mike Frysinger <vapier@gentoo.org>, Yoshinori Sato <ysato@users.sourceforge.jp>, Richard Kuo <rkuo@codeaurora.org>, "James E.J. Bottomley" <jejb@parisc-linux.org>, Helge Deller <deller@gmx.de>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, "paulus@samba.org" <paulus@samba.org>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, linux390@de.ibm.com, Paul Mundt <lethal@linux-sh.org>, Jeff Dike <jdike@addtoit.com>, Richard Weinberger <richard@nod.at>, Thomas Gleixner <tglx@linutronix.de>, "mingo@redhat.com" <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Serge Hallyn <serge.hallyn@canonical.com>, Paul McKenney <paulmck@linux.vnet.ibm.com>, Frederic Weisbecker <fweisbec@gmail.com>, David Miller <davem@davemloft.net>, Andrew Morton <akpm@linux-foundation.org>, Akinobu Mita <akinobu.mita@gmail.com>, Catalin Marinas <Catalin.Marinas@arm.com>, Michel Lespinasse <walken@google.com>, Will Deacon <will.deacon@arm.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "uclinux-dist-devel@blackfin.uclinux.org" <uclinux-dist-devel@blackfin.uclinux.org>, linux-hexagon@vger.kernel.org, Parisc List <linux-parisc@vger.kernel.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, linux-s390@vger.kernel.org, Linux-sh list <linux-sh@vger.kernel.org>, uml-devel <user-mode-linux-devel@lists.sourceforge.net>, uml-user <user-mode-linux-user@lists.sourceforge.net>, Linux-Arch <linux-arch@vger.kernel.org>
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On Thursday 23 May 2013, Geert Uytterhoeven wrote:
> > -config BUG
> > -       bool "BUG() support" if EXPERT
> > -       default y
> > -       help
> > -          Disabling this option eliminates support for BUG and WARN, reducing
> > -          the size of your kernel image and potentially quietly ignoring
> > -          numerous fatal conditions. You should only consider disabling this
> > -          option for embedded systems with no facilities for reporting errors.
> > -          Just say Y.
> 
> ... It's about reducing memory size on devices where you can't show bug or
> warning messages.
> 
> > So need get rid of 'CONFIG_BUG', and let it always enabled everywhere.
> 
> So please keep it.

Agreed. The one annoying property of disabling BUG() support is that it causes
a large number of build warnings since the compiler now has to assume that a lot
of code is reachable when it is normally annotate as unreachable.

When I do "randconfig" tests, I always turn on CONFIG_BUG because of this.

	Arnd