x86: head_64.S cleanup - use straight move to CR4 register

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 2f59ca8bd16c24d9d90f79705c99afdeb280ea3c..7475b4c91f05efbea8cfda946ef419a5ce28eb3e 100644 (file)
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -155,9 +155,7 @@ ENTRY(secondary_startup_64)
         */
 
        /* Enable PAE mode and PGE */
-       xorq    %rax, %rax
-       btsq    $5, %rax
-       btsq    $7, %rax
+       movl    $(X86_CR4_PAE | X86_CR4_PGE), %eax
        movq    %rax, %cr4
 
        /* Setup early boot stage 4 level pagetables. */