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

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Message-ID: <1340230589.1773.7.camel@x61.thuisdomein>
Date:	Thu, 21 Jun 2012 00:16:29 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Jeff Epler <jepler@...tnebr.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: boot: Remove ancient dead code

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
-- 
1.7.7.6

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