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

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Date:	Thu, 21 Jun 2012 00:23:47 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
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
Subject: Re: [PATCH] x86: boot: Remove ancient dead code

On Thu, 21 Jun 2012, Paul Bolle 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!
> 
> Signed-off-by: Paul Bolle <pebolle@...cali.nl>
> Link: https://lkml.org/lkml/1996/3/30/38
> Cc: Jeff Epler <jepler@...tnebr.com>
> ---
>  arch/x86/boot/header.S |    7 -------
>  1 files changed, 0 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
> index efe5acf..9b9c647 100644
> --- a/arch/x86/boot/header.S
> +++ b/arch/x86/boot/header.S
> @@ -406,13 +406,6 @@ init_size:		.long INIT_SIZE		# kernel initialization size
>  
>  	.section ".entrytext", "ax"
>  start_of_setup:
> -#ifdef SAFE_RESET_DISK_CONTROLLER
> -# Reset the disk controller.
> -	movw	$0x0000, %ax		# Reset disk controller
> -	movb	$0x80, %dl		# All disks
> -	int	$0x13
> -#endif
> -
>  # Force %es = %ds
>  	movw	%ds, %ax
>  	movw	%ax, %es
> 
Looks good to me.
Not that I have much knowledge of the code, but I did dig the history a 
bit and yes, this looks like long dead stuff that should just go away.

Acked-by: Jesper Juhl <jj@...osbits.net>


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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