From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH, re-send] Always trap on BUG()
Date: Tue, 23 Jul 2013 02:54:06 -0700
Message-ID: <51EE52BE.5080204@zytor.com>
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To: Ingo Molnar <mingo@kernel.org>
Cc: linux-arch@vger.kernel.org, Russell King - ARM Linux <linux@arm.linux.org.uk>, Arnd Bergmann <arnd@arndb.de>, Chen Gang <gang.chen@asianux.com>, linux-kernel@vger.kernel.org, Geert Uytterhoeven <geert@linux-m68k.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org

On 07/23/2013 02:36 AM, Ingo Molnar wrote:
>>
>> Well, there are three alternatives here, right:
>>
>> 1. We can use unreachable(), which means that the compiler can assume it
>> never happens.
> 
> AFAICS this is dangerous as it loses warnings and moves execution into 
> la-la-land without any obvious sign at the C level.
> 

Extremely dangerous.

	-hpa