commit 2dead15fb8f6522b96c913603b5ad0b5c7d01f49
author Lans Zhang <lans.zhang2008@gmail.com> Fri Mar 01 09:20:39 2013 +0800
committer H. Peter Anvin <hpa@linux.intel.com> Fri Mar 01 10:18:33 2013 -0800
tree eaefab90bf50b16bf8c6a62d7168d48c7a9a3130
parent de1a2262b006220dae2561a299a6ea128c46f4fe

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@gmail.com>
Link: http://lkml.kernel.org/r/51300267.6000008@gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/boot/compressed/head_64.S

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 @@
 	jnz 1f
 
 	cli
-	movl	$(__KERNEL_DS), %eax
+	movl	$(__BOOT_DS), %eax
 	movl	%eax, %ds
 	movl	%eax, %es
 	movl	%eax, %ss