linux-kernel - [PATCH] x86 cleanup: suspend_asm_64.S - use X86_CR4

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Message-ID: <20080208214913.GB6787@cvg>
Date:	Sat, 9 Feb 2008 00:49:13 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...e.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE instead of
	numeric value

By including <asm/processor-flags.h> we're allowed to use
X86_CR4_PGE instead of numeric constant.

md5 sums of compiled files are differ due to this inclusion
but .text section remains the same.

---

If anyone has an objection on this patch - just drop it please.

I'm not sure but this could have a side effect in case of future
<asm/processor-flags.h> modifications so it would require
__ASSEMBLY__ preprocessor directive.

Index: linux-2.6.git/arch/x86/kernel/suspend_asm_64.S
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/suspend_asm_64.S	2008-02-09 00:28:45.000000000 +0300
+++ linux-2.6.git/arch/x86/kernel/suspend_asm_64.S	2008-02-09 00:28:48.000000000 +0300
@@ -9,12 +9,13 @@
  * image could very well be data page in "new" image, and overwriting
  * your own stack under you is bad idea.
  */
-	
+
 	.text
 #include <linux/linkage.h>
 #include <asm/segment.h>
 #include <asm/page.h>
 #include <asm/asm-offsets.h>
+#include <asm/processor-flags.h>
 
 ENTRY(swsusp_arch_suspend)
 	movq	$saved_context, %rax
@@ -55,7 +56,7 @@ ENTRY(restore_image)
 	/* Flush TLB */
 	movq	mmu_cr4_features(%rip), %rax
 	movq	%rax, %rdx
-	andq	$~(1<<7), %rdx	# PGE
+	andq	$~(X86_CR4_PGE), %rdx
 	movq	%rdx, %cr4;  # turn off PGE
 	movq	%cr3, %rcx;  # flush TLB
 	movq	%rcx, %cr3;
@@ -107,7 +108,7 @@ ENTRY(restore_registers)
 	/* Flush TLB, including "global" things (vmalloc) */
 	movq	mmu_cr4_features(%rip), %rax
 	movq	%rax, %rdx
-	andq	$~(1<<7), %rdx;  # PGE
+	andq	$~(X86_CR4_PGE), %rdx
 	movq	%rdx, %cr4;  # turn off PGE
 	movq	%cr3, %rcx;  # flush TLB
 	movq	%rcx, %cr3
--
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