From: Brian Gerst <brgerst@gmail.com>
Date: Sat, 17 Jul 2010 13:03:28 +0000 (-0400)
Subject: x86-64: Simplify loading initial_gs
X-Git-Tag: v3.12-rc1~9452^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=650fb4393dff543bc980d361555c489fbdeed088;p=kernel%2Fkernel-generic.git

x86-64: Simplify loading initial_gs

Load initial_gs as two 32-bit values instead of splitting a 64-bit value.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1279371808-24804-3-git-send-email-brgerst@gmail.com>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 3d1e6f1..239046b 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -234,9 +234,8 @@ ENTRY(secondary_startup_64)
 	 * init data section till per cpu areas are set up.
 	 */
 	movl	$MSR_GS_BASE,%ecx
-	movq	initial_gs(%rip),%rax
-	movq    %rax,%rdx
-	shrq	$32,%rdx
+	movl	initial_gs(%rip),%eax
+	movl	initial_gs+4(%rip),%edx
 	wrmsr	
 
 	/* esi is pointer to real mode structure with interesting info.