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

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Message-ID: <4B2FCCE3.1090209@redhat.com>
Date:	Mon, 21 Dec 2009 11:30:43 -0800
From:	Richard Henderson <rth@...hat.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
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 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.


r~
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