linux-kernel - Re: [PATCH][RFC] getting rid of stupid loop in BUG()

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Date:	Wed, 25 Jul 2007 13:37:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Chuck Ebbert <cebbert@...hat.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Al Viro <viro@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, kaos@....com.au,
	xyzzy@...akeasy.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()

Chuck Ebbert wrote:
> On 07/25/2007 01:41 PM, Jeremy Fitzhardinge wrote:
>> I reported it as a gcc bug, but they refused to hear of it.  Details at
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29305
>>
> 
> Wow.
> 
> I especially like "You should plan a better way. "

FWIW, at Transmeta we had a local extension to gcc called
"__builtin_not_reached()" which we used to tell gcc that an assembly
statement would terminate the control flow.

Another useful extension was a variant of __builtin_trap() which would
create a dummy ELF relocation for the trapping instruction with a target.

	-hpa
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