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Date: Wed, 14 Feb 2018 13:32:53 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: Cyrill Gorcunov <gorcunov@...il.com>, linux-kernel@...r.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH] x86/asm: Use PAGE_SIZE instead of 4096 where appropriate
Cyrill pointed that it makes sense to replace 4096 to PAGE_SIZE in
head_64.S.
This patch replaces 4096 with PAGE_SIZE everywhere in assembly code
where it fits semantically.
Suggested-by: Cyrill Gorcunov <gorcunov@...il.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
arch/x86/boot/compressed/head_64.S | 4 ++--
arch/x86/entry/vsyscall/vsyscall_emu_64.S | 4 ++--
arch/x86/kernel/head_32.S | 2 +-
arch/x86/lib/clear_page_64.S | 7 ++++---
arch/x86/lib/copy_page_64.S | 5 +++--
arch/x86/purgatory/setup-x86_64.S | 5 +++--
arch/x86/purgatory/stack.S | 6 ++++--
7 files changed, 19 insertions(+), 14 deletions(-)
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 99a0e7993252..4fa83b90af8e 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -652,10 +652,10 @@ trampoline_save:
* Space for page tables (not in .bss so not zeroed)
*/
.section ".pgtable","a",@nobits
- .balign 4096
+ .balign PAGE_SIZE
pgtable:
.fill BOOT_PGT_SIZE, 1, 0
.global pgtable_trampoline
pgtable_trampoline:
- .fill 4096, 1, 0
+ .fill PAGE_SIZE, 1, 0
diff --git a/arch/x86/entry/vsyscall/vsyscall_emu_64.S b/arch/x86/entry/vsyscall/vsyscall_emu_64.S
index c9596a9af159..ac3e37bcff48 100644
--- a/arch/x86/entry/vsyscall/vsyscall_emu_64.S
+++ b/arch/x86/entry/vsyscall/vsyscall_emu_64.S
@@ -32,6 +32,6 @@ __vsyscall_page:
syscall
ret
- .balign 4096, 0xcc
+ .balign PAGE_SIZE, 0xcc
- .size __vsyscall_page, 4096
+ .size __vsyscall_page, PAGE_SIZE
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index c29020907886..ab10212f34ab 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -530,7 +530,7 @@ initial_pg_fixmap:
.fill 1024,4,0
.globl empty_zero_page
empty_zero_page:
- .fill 4096,1,0
+ .fill PAGE_SIZE,1,0
.globl swapper_pg_dir
swapper_pg_dir:
.fill 1024,4,0
diff --git a/arch/x86/lib/clear_page_64.S b/arch/x86/lib/clear_page_64.S
index 81b1635d67de..ef0d0bc09a5d 100644
--- a/arch/x86/lib/clear_page_64.S
+++ b/arch/x86/lib/clear_page_64.S
@@ -2,6 +2,7 @@
#include <asm/cpufeatures.h>
#include <asm/alternative-asm.h>
#include <asm/export.h>
+#include <asm/page_types.h>
/*
* Most CPUs support enhanced REP MOVSB/STOSB instructions. It is
@@ -15,7 +16,7 @@
* %rdi - page
*/
ENTRY(clear_page_rep)
- movl $4096/8,%ecx
+ movl $PAGE_SIZE/8,%ecx
xorl %eax,%eax
rep stosq
ret
@@ -24,7 +25,7 @@ EXPORT_SYMBOL_GPL(clear_page_rep)
ENTRY(clear_page_orig)
xorl %eax,%eax
- movl $4096/64,%ecx
+ movl $PAGE_SIZE/64,%ecx
.p2align 4
.Lloop:
decl %ecx
@@ -45,7 +46,7 @@ ENDPROC(clear_page_orig)
EXPORT_SYMBOL_GPL(clear_page_orig)
ENTRY(clear_page_erms)
- movl $4096,%ecx
+ movl $PAGE_SIZE,%ecx
xorl %eax,%eax
rep stosb
ret
diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S
index fd2d09afa097..8c6ef546b3f0 100644
--- a/arch/x86/lib/copy_page_64.S
+++ b/arch/x86/lib/copy_page_64.S
@@ -5,6 +5,7 @@
#include <asm/cpufeatures.h>
#include <asm/alternative-asm.h>
#include <asm/export.h>
+#include <asm/page_types.h>
/*
* Some CPUs run faster using the string copy instructions (sane microcode).
@@ -15,7 +16,7 @@
ALIGN
ENTRY(copy_page)
ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
- movl $4096/8, %ecx
+ movl $PAGE_SIZE/8, %ecx
rep movsq
ret
ENDPROC(copy_page)
@@ -26,7 +27,7 @@ ENTRY(copy_page_regs)
movq %rbx, (%rsp)
movq %r12, 1*8(%rsp)
- movl $(4096/64)-5, %ecx
+ movl $(PAGE_SIZE/64)-5, %ecx
.p2align 4
.Loop64:
dec %rcx
diff --git a/arch/x86/purgatory/setup-x86_64.S b/arch/x86/purgatory/setup-x86_64.S
index dfae9b9e60b5..3eff1c8bde70 100644
--- a/arch/x86/purgatory/setup-x86_64.S
+++ b/arch/x86/purgatory/setup-x86_64.S
@@ -10,6 +10,7 @@
* Version 2. See the file COPYING for more details.
*/
#include <asm/purgatory.h>
+#include <asm/page_types.h>
.text
.globl purgatory_start
@@ -53,7 +54,7 @@ gdt: /* 0x00 unusable segment
gdt_end:
.bss
- .balign 4096
+ .balign PAGE_SIZE
lstack:
- .skip 4096
+ .skip PAGE_SIZE
lstack_end:
diff --git a/arch/x86/purgatory/stack.S b/arch/x86/purgatory/stack.S
index 50a4147f91fb..f39989a6b7d5 100644
--- a/arch/x86/purgatory/stack.S
+++ b/arch/x86/purgatory/stack.S
@@ -7,13 +7,15 @@
* Version 2. See the file COPYING for more details.
*/
+#include <asm/page_types.h>
+
/* A stack for the loaded kernel.
* Separate and in the data section so it can be prepopulated.
*/
.data
- .balign 4096
+ .balign PAGE_SIZE
.globl stack, stack_end
stack:
- .skip 4096
+ .skip PAGE_SIZE
stack_end:
--
2.15.1
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