linux-kernel - [PATCH] x86 suspend: Sanitize wakeup

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Message-Id: <200810262042.20295.rjw@sisk.pl>
Date:	Sun, 26 Oct 2008 20:42:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: [PATCH] x86 suspend: Sanitize wakeup_64.S

Hi,

Please queue as .29 material.

Thanks,
Rafael

---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: x86 suspend: Sanitize wakeup_64.S

Segment registers are already set by head_64.S, which jumps into
wakeup_64.S, to the same values that wakeup_64.S wants them to
contain.  Remove the unnecessary initialization of segment registers
from wakeup_64.S.

Add hlt into the endless loop under bogus_64_magic.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 arch/x86/kernel/acpi/wakeup_64.S |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index bcc2934..0c5bf2f 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -19,12 +19,6 @@ wakeup_long64:
 	cmpq	%rdx, %rax
 	jne	bogus_64_magic
 
-	movw	$__KERNEL_DS, %ax
-	movw	%ax, %ss	
-	movw	%ax, %ds
-	movw	%ax, %es
-	movw	%ax, %fs
-	movw	%ax, %gs
 	movq	saved_rsp, %rsp
 
 	movq	saved_rbx, %rbx
@@ -36,6 +30,7 @@ wakeup_long64:
 	jmp	*%rax
 
 bogus_64_magic:
+	hlt
 	jmp	bogus_64_magic
 
 	.align 2
-- 
1.5.6

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