linux-kernel - Re: Definition of BUG on x86

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Date:	Thu, 19 Feb 2009 08:34:20 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Petr Tesarik <ptesarik@...e.cz>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Definition of BUG on x86

Ingo Molnar wrote:
> Well, the important question is thatGCC will optimize out 
> whatever comes after the __builtin_trap(), right? To guarantee 
> an assert we can do something like:
>
>  	__builtin_trap();
> 	panic("should never get here");
>
> to guarantee a message. (But realistically GCC will at most 
> generate a build error.)
>   

Ah, right, I remember the problem.  There's no guaranteed way of getting 
the address of the ud2a instruction __builtin_trap generates to put it 
into the bug table.

    J
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