linux-kernel - Re: [PATCH] ARM: Convert BUG() to use unreachable()

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Message-ID: <4B30AE8E.8060805@gnu.org>
Date:	Tue, 22 Dec 2009 12:33:34 +0100
From:	Paolo Bonzini <bonzini@....org>
To:	Richard Guenther <richard.guenther@...il.com>
CC:	David Daney <ddaney@...iumnetworks.com>,
	Jamie Lokier <jamie@...reable.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: Convert BUG() to use unreachable()

On 12/17/2009 06:17 PM, Richard Guenther wrote:
> It shouldn't as *(int *)0 = 0; might trap.  But if you want to be sure
> use
>     __builtin_trap ();
> instead for the whole sequence (the unreachable is implied then).
> GCC choses a size-optimal trap representation for your target then.

Agree that it shouldn't but just to be sure I'd use

   *(volatile int *)0 = 0;
   unreachable ();

Paolo
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