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>

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.