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

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Date:	Wed, 25 Jul 2007 18:25:42 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	David Miller <davem@...emloft.net>, hpa@...or.com,
	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()

On Wed, Jul 25, 2007 at 10:19:55AM -0700, Linus Torvalds wrote:
> 
> 
> On Wed, 25 Jul 2007, Jeremy Fitzhardinge wrote:
> > 
> > No, not any more.  The file and line info is out of line, in a separate
> > section, indexed by the ud2a's eip.
> 
> That's irrelevant - the point is, we need to do the ud2 by hand, since we 
> need to control the code generation in order to associate the ud2 with the 
> proper file/linenr.
> 
> > 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).
> 
> Right. Which is why we need to do it as an inline asm.

Who said that we need to populate that section from asm?  Define
a static variable in that section inside a block; identifier is
not a problem, obviously.

I'm not saying that it's not revolting, but it's not impossible.
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