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

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Message-ID: <20080217181716.GY6006@elte.hu>
Date:	Sun, 17 Feb 2008 19:17:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...e.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE
	instead of numeric value


* Cyrill Gorcunov <gorcunov@...il.com> wrote:

> 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.

thanks Cyrill, picked it up. (the merged version is below - the target 
files moved meanwhile)

	Ingo

------------->
Subject: x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE instead of numeric value
From: Cyrill Gorcunov <gorcunov@...il.com>
Date: Sat, 9 Feb 2008 00:49:13 +0300

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.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/power/hibernate_asm_64.S |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-x86.q/arch/x86/power/hibernate_asm_64.S
===================================================================
--- linux-x86.q.orig/arch/x86/power/hibernate_asm_64.S
+++ linux-x86.q/arch/x86/power/hibernate_asm_64.S
@@ -20,6 +20,7 @@
 #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
@@ -60,7 +61,7 @@ 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;
@@ -112,7 +113,7 @@ 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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