linux-kernel - Re: [PATCH] Put the BUG __FILE__ and __LINE_

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Message-ID: <20060928071617.GA84041@muc.de>
Date:	Thu, 28 Sep 2006 09:16:17 +0200
From:	Andi Kleen <ak@....de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Put the BUG __FILE__ and __LINE__ info out of line

On Wed, Sep 27, 2006 at 11:00:03PM -0700, Jeremy Fitzhardinge wrote:
> When CONFIG_DEBUG_BUGVERBOSE is enabled, the embedded file and line
> information makes a disassembler very unhappy, because it tries to
> parse them as instructions (it probably makes the CPU's instruction
> decoder a little unhappy too).
> 
> This patch moves them out of line, and calls the ud2 from the code -
> the call makes sure the original %eip is available on the top of the
> stack.  The result is a happy disassembler, with no loss of debugging
> information.

x86-64 has a much better solution for this. Please copy that one.

-Andi
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