linux-kernel - [tip:x86/asm] x86-64: Simplify loading initial

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Message-ID: <tip-650fb4393dff543bc980d361555c489fbdeed088@git.kernel.org>
Date:	Thu, 22 Jul 2010 05:01:24 GMT
From:	tip-bot for Brian Gerst <brgerst@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	penberg@...helsinki.fi, brgerst@...il.com, tglx@...utronix.de
Subject: [tip:x86/asm] x86-64: Simplify loading initial_gs

Commit-ID:  650fb4393dff543bc980d361555c489fbdeed088
Gitweb:     http://git.kernel.org/tip/650fb4393dff543bc980d361555c489fbdeed088
Author:     Brian Gerst <brgerst@...il.com>
AuthorDate: Sat, 17 Jul 2010 09:03:28 -0400
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Wed, 21 Jul 2010 21:23:51 -0700

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@...il.com>
LKML-Reference: <1279371808-24804-3-git-send-email-brgerst@...il.com>
Reviewed-by: Pekka Enberg <penberg@...helsinki.fi>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/kernel/head_64.S |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

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.
--
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