linux-kernel - Re: [PATCH] x86: boot: Remove ancient dead code

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Message-ID: <20120621054601.GA20066@gmail.com>
Date:	Thu, 21 Jun 2012 07:46:01 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Jeff Epler <jepler@...tnebr.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86: boot: Remove ancient dead code


* Paul Bolle <pebolle@...cali.nl> wrote:

> Release v1.3.82 wrapped a few lines of code in an "#ifdef
> SAFE_RESET_DISK_CONTROLLER" and "#endif" pair. Since
> SAFE_RESET_DISK_CONTROLLER was never defined anywhere that was basically
> a verbose "#ifdef 0" and "#endif" pair. These dead lines have been in
> the tree for sixteen years but now the time has come to remove them.
> 
> I guess the main lesson here is that if you want your dead code in the
> tree for a very long time you'd better be creative. A plain old "#ifdef
> 0" and "#endif" pair just doesn't cut it!

and putting it into assembly code is also key to success!

Thanks,

	Ingo
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