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

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Message-ID: <46A7B1EA.7030303@zytor.com>
Date:	Wed, 25 Jul 2007 13:26:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Miller <davem@...emloft.net>
CC:	jeremy@...p.org, viro@....linux.org.uk,
	torvalds@...ux-foundation.org, 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()

David Miller wrote:
> 
> Another issue is that if you have a conditional trap instruction on
> your cpu, and you try the __label__ trick, GCC no longer converts:
> 
> 	BUG_ON(test)
> 
> into just a:
> 
> 	set condition codes;
> 	conditional_trap;
> 
> sequence because the "stuff" inside the basic block is something
> more than just the __builtin_trap().
> 
> The holy grail would be being able to get the perfect conditional
> trap sequence, plus the annotations in a seperate section.

I think that would require a custom gcc builtin, which we might be able
to ask the gcc folks for...

	-hpa
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