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

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Message-ID: <46A781A4.40103@goop.org>
Date:	Wed, 25 Jul 2007 10:00:20 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	David Miller <davem@...emloft.net>, hpa@...or.com, kaos@....com.au,
	xyzzy@...akeasy.org, viro@....linux.org.uk,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()

Linus Torvalds wrote:
> .. and I'm pretty sure it's immaterial.
>
> We don't just do the "ud2" instruction - we also do the file and line 
> number information after it. Which means that __builtin_trap() is useless.
>   

No, not any more.  The file and line info is out of line, in a separate
section, indexed by the ud2a's eip.  The main problem with
__builtin_trap is that there's no certain way to get the actual ud2a eip
(ie, paste an asm label onto it).

    J
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