[tip:x86/cleanups] x86_64: Use __BOOT_DS instead_of __KERNEL_DS for safety

[tip-bot for Lans Zhang]

Commit-ID:  2dead15fb8f6522b96c913603b5ad0b5c7d01f49
Gitweb:     http://git.kernel.org/tip/2dead15fb8f6522b96c913603b5ad0b5c7d01f49
Author:     Lans Zhang <lans.zhang2008@xxxxxxxxx>
AuthorDate: Fri, 1 Mar 2013 09:20:39 +0800
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Fri, 1 Mar 2013 10:18:33 -0800

x86_64: Use __BOOT_DS instead_of __KERNEL_DS for safety

In startup_32, the running code still uses the initial GDT
located in setup. Thus, __BOOT_DS is preferred. Currently
__KERNEL_DS is lucky to equal to __BOOT_DS, but this is
not always a safe way.

Signed-off-by: Lans Zhang <lans.zhang2008@xxxxxxxxx>
Link: http://lkml.kernel.org/r/51300267.6000008@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/head_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index c1d383d..16f24e6 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -52,7 +52,7 @@ ENTRY(startup_32)
 	jnz 1f
 
 	cli
-	movl	$(__KERNEL_DS), %eax
+	movl	$(__BOOT_DS), %eax
 	movl	%eax, %ds
 	movl	%eax, %es
 	movl	%eax, %ss
--
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