linux-kernel - [PATCH v1][CLEANUP] x86: use already defined macros instead of hard-coded values

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Message-Id: <1425562251-10218-1-git-send-email-kuleshovmail@gmail.com>
Date:	Thu,  5 Mar 2015 19:30:51 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH v1][CLEANUP] x86: use already defined macros instead of hard-coded values

This patch provides following minor fixes:

* Remove non-used L3_PAGE_OFFSET
* Use already defined L3_START_KERNEL and other macros instead of hard-coded
values
* Fix paths in a comments

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 arch/x86/kernel/head_64.S | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 6fd514d9..dbc4ef3 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -1,6 +1,4 @@
 /*
- *  linux/arch/x86_64/kernel/head.S -- start in 32bit and switch to 64bit
- *
  *  Copyright (C) 2000 Andrea Arcangeli <andrea@...e.de> SuSE
  *  Copyright (C) 2000 Pavel Machek <pavel@...e.cz>
  *  Copyright (C) 2000 Karsten Keil <kkeil@...e.de>
@@ -20,6 +18,7 @@
 #include <asm/processor-flags.h>
 #include <asm/percpu.h>
 #include <asm/nops.h>
+#include <asm/cpufeature.h>
 
 #ifdef CONFIG_PARAVIRT
 #include <asm/asm-offsets.h>
@@ -38,7 +37,6 @@
 #define pud_index(x)	(((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 
 L4_PAGE_OFFSET = pgd_index(__PAGE_OFFSET)
-L3_PAGE_OFFSET = pud_index(__PAGE_OFFSET)
 L4_START_KERNEL = pgd_index(__START_KERNEL_map)
 L3_START_KERNEL = pud_index(__START_KERNEL_map)
 
@@ -56,7 +54,7 @@ startup_64:
 	 * %rsi holds a physical pointer to real_mode_data.
 	 *
 	 * We come here either directly from a 64bit bootloader, or from
-	 * arch/x86_64/boot/compressed/head.S.
+	 * arch/x86/boot/compressed/head_64.S.
 	 *
 	 * We only come here initially at boot nothing else comes here.
 	 *
@@ -90,8 +88,8 @@ startup_64:
 	 */
 	addq	%rbp, early_level4_pgt + (L4_START_KERNEL*8)(%rip)
 
-	addq	%rbp, level3_kernel_pgt + (510*8)(%rip)
-	addq	%rbp, level3_kernel_pgt + (511*8)(%rip)
+	addq	%rbp, level3_kernel_pgt + (L3_START_KERNEL*8)(%rip)
+	addq	%rbp, level3_kernel_pgt + (L3_START_KERNEL*8 + 1)(%rip)
 
 	addq	%rbp, level2_fixmap_pgt + (506*8)(%rip)
 
@@ -199,7 +197,7 @@ ENTRY(secondary_startup_64)
 	movl	$MSR_EFER, %ecx
 	rdmsr
 	btsl	$_EFER_SCE, %eax	/* Enable System Call */
-	btl	$20,%edi		/* No Execute supported? */
+	btl	$X86_FEATURE_NX, %edi	/* No Execute supported? */
 	jnc     1f
 	btsl	$_EFER_NX, %eax
 	btsq	$_PAGE_BIT_NX,early_pmd_flags(%rip)
@@ -441,7 +439,7 @@ GLOBAL(name)
 
 	__INITDATA
 NEXT_PAGE(early_level4_pgt)
-	.fill	511,8,0
+	.fill	L4_START_KERNEL,8,0
 	.quad	level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE
 
 NEXT_PAGE(early_dynamic_pgts)
-- 
2.3.1.167.g7f4ba4b

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