linux-kernel - Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)

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Message-ID: <Pine.LNX.4.64.0609301326320.3952@g5.osdl.org>
Date:	Sat, 30 Sep 2006 13:28:14 -0700 (PDT)
From:	Linus Torvalds <torvalds@...l.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	Eric Rannaud <eric.rannaud@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>,
	nagar@...son.ibm.com, Chandra Seetharaman <sekharan@...ibm.com>,
	Andi Kleen <ak@...e.de>, Jan Beulich <jbeulich@...ell.com>
Subject: Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)



On Sat, 30 Sep 2006, Al Viro wrote:
> 
> Oh, so _that_ is what it is supposed to do?  I've seen it when it went
> in, tried to read, barfed and chalked it up to KDB or itanic braindamage
> (both have turds of that genre).  Didn't realize that lockdep used it too...

Well, anything that shows or needs a back-trace. By definition, it's 
pretty much just debug code.

I sure as hell hope we don't have any actual _semantics_ that depend on 
back-traces, like the broken asynchronous C++ exception handling code etc 
that people have in user space (what a total brain-damage _that_ is!).

		Linus
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