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

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Message-ID: <20091221201059.GD11669@n2100.arm.linux.org.uk>
Date:	Mon, 21 Dec 2009 20:10:59 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Richard Henderson <rth@...hat.com>
Cc:	Richard Guenther <richard.guenther@...il.com>,
	David Daney <ddaney@...iumnetworks.com>,
	"gcc@....gnu.org" <gcc@....gnu.org>,
	Jamie Lokier <jamie@...reable.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] ARM: Convert BUG() to use unreachable()

On Mon, Dec 21, 2009 at 11:30:43AM -0800, Richard Henderson wrote:
> On 12/17/2009 10:17 AM, Russell King - ARM Linux wrote:
>> How is "size-optimal trap" defined?
>
> E.g. Sparc and MIPS have "tcc" instructions that trap based on the
> condition codes, and so we eliminate the branch.  That's the only
> optimization we apply with __builtin_trap.
>
>> Let me put it another way: I want this function to terminate with an
>> explicit NULL pointer dereference in every case.
>
> Then just use that.

That's precisely what we have been using for many years.
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