linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override

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Date:	Sun, 30 Dec 2007 23:02:06 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Bodo Eggert <7eggert@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rene Herman <rene.herman@...access.nl>, dpreed@...d.com,
	Islam Amer <pharon@...il.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > ok. Like the patch below?
> 
> Not quite - you still need the loop in case you NMI and then run off 
> into oblivion

yes indeed. Updated patch below.

	Ingo

-------------->
Subject: x86: hlt on early crash
From: Ingo Molnar <mingo@...e.hu>

H. Peter Anvin <hpa@...or.com> wrote:

> It probably should actually HLT, to avoid sucking power, and stressing
> the thermal system.  We're dead at this point, and the early 486's
> which had problems with HLT will lock up - we don't care.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/boot/compressed/misc_32.c |    3 ++-
 arch/x86/boot/compressed/misc_64.c |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

Index: linux-x86.q/arch/x86/boot/compressed/misc_32.c
===================================================================
--- linux-x86.q.orig/arch/x86/boot/compressed/misc_32.c
+++ linux-x86.q/arch/x86/boot/compressed/misc_32.c
@@ -339,7 +339,8 @@ static void error(char *x)
 	putstr(x);
 	putstr("\n\n -- System halted");
 
-	while(1);	/* Halt */
+	while (1)
+		asm("hlt");
 }
 
 asmlinkage void decompress_kernel(void *rmode, unsigned long end,
Index: linux-x86.q/arch/x86/boot/compressed/misc_64.c
===================================================================
--- linux-x86.q.orig/arch/x86/boot/compressed/misc_64.c
+++ linux-x86.q/arch/x86/boot/compressed/misc_64.c
@@ -338,7 +338,8 @@ static void error(char *x)
 	putstr(x);
 	putstr("\n\n -- System halted");
 
-	while(1);	/* Halt */
+	while (1)
+		asm("hlt");
 }
 
 asmlinkage void decompress_kernel(void *rmode, unsigned long heap,

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