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Date: Wed, 25 Jul 2007 18:25:42 +0100
From: Al Viro <viro@ftp.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, David Miller <davem@davemloft.net>,
       hpa@zytor.com, kaos@ocs.com.au, xyzzy@speakeasy.org,
       linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()
Message-ID: <20070725172542.GG27237@ftp.linux.org.uk>
References: <21803.1185331847@ocs10w.ocs.com.au> <46A6DB04.3000003@zytor.com> <46A6ECB7.7090208@goop.org> <20070724.232914.56812376.davem@davemloft.net> <alpine.LFD.0.999.0707250954400.3607@woody.linux-foundation.org> <46A781A4.40103@goop.org> <alpine.LFD.0.999.0707251018280.3607@woody.linux-foundation.org>
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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.