linux-kernel - Re: [PATCH RFC 1/4] Generic BUG handling.

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Message-Id: <20060929021019.19058b98.akpm@osdl.org>
Date:	Fri, 29 Sep 2006 02:10:19 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Andi Kleen <ak@....de>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org, Hugh Dickens <hugh@...itas.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH RFC 1/4] Generic BUG handling.

On 29 Sep 2006 10:57:45 +0200
Andi Kleen <ak@....de> wrote:

> > Some architectures (powerpc) implement WARN using the same mechanism;
> > if the illegal instruction was the result of a WARN, then report_bug()
> > returns 1; otherwise it returns 0.
> 
> In theory we could do that on x86 too (and skipping the instruction), 
> the only problem 
> is that the only guaranteed to fault opcode is ud2 :/. Ok maybe we could
> reserve some int XXX vector.
> 
> % gid WARN_ON | grep -v arch | wc -l
> 299

powerpc sets a bit in the __LINE__ number to indicate that it was a
WARN_ON.  That'll work on all architectures.

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