There is no need for testing the values because we already know
what they should be. Just set them in straight way.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
Index: linux-2.6.git/arch/x86/kernel/head_64.S
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/head_64.S	2008-05-13 19:17:31.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/head_64.S	2008-05-13 19:35:11.000000000 +0400
@@ -155,9 +155,7 @@ ENTRY(secondary_startup_64)
 	 */
 
 	/* Enable PAE mode and PGE */
-	xorq	%rax, %rax
-	btsq	$5, %rax
-	btsq	$7, %rax
+	movq	$(X86_CR4_PAE | X86_CR4_PGE), %rax
 	movq	%rax, %cr4
 
 	/* Setup early boot stage 4 level pagetables. */
-- 
--
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原文链接: http://lkml.org/lkml/2008/5/13/283
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