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

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Message-ID: <20060928071731.GB84041@muc.de>
Date:	Thu, 28 Sep 2006 09:17:31 +0200
From:	Andi Kleen <ak@....de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Put the BUG __FILE__ and __LINE__ info out of line

> Plan #17 is to just put the BUG inline and then put the EIP+file*+line into
> a separate section, then search that section at BUG time to find the record
> whose EIP points back at this ud2a.
> 
> It's a bit messy for modules, but it minimises the .text impact and keeps
> disassembly happy, no?
> 
> And if done right it can probably be used by other architectures.


The way x86-64 solved it was to turn the inline code into valid
instructions. This can be done with two additional bytes.
IMHO that's the right solution for the problem on i386 too

-Andi

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