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Date: Tue, 04 Dec 2007 13:55:05 -0800
From: Harvey Harrison <harvey.harrison@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCHv2] Unify mmap_[32|64].c
Start from mmap_32.c and add X86_64 specific function as well.
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
Resent without git-specific patch rename. Also, missed the <linux/personality.h>
include in the last version, still learning git over here and generated the wrong
patch.
arch/x86/mm/Makefile_32 | 2 +-
arch/x86/mm/Makefile_64 | 3 +-
arch/x86/mm/mmap.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++
arch/x86/mm/mmap_32.c | 81 -------------------------------------------
arch/x86/mm/mmap_64.c | 32 -----------------
5 files changed, 89 insertions(+), 116 deletions(-)
diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32
index 362b4ad..a01aca7 100644
--- a/arch/x86/mm/Makefile_32
+++ b/arch/x86/mm/Makefile_32
@@ -2,7 +2,7 @@
# Makefile for the linux i386-specific parts of the memory manager.
#
-obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap_32.o
+obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap.o
obj-$(CONFIG_NUMA) += discontig_32.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/arch/x86/mm/Makefile_64 b/arch/x86/mm/Makefile_64
index d18baed..b5a7448 100644
--- a/arch/x86/mm/Makefile_64
+++ b/arch/x86/mm/Makefile_64
@@ -2,9 +2,8 @@
# Makefile for the linux x86_64-specific parts of the memory manager.
#
-obj-y := init_64.o fault_64.o ioremap_64.o extable_64.o pageattr_64.o mmap_64.o
+obj-y := init_64.o fault_64.o ioremap_64.o extable_64.o pageattr_64.o mmap.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa_64.o
obj-$(CONFIG_K8_NUMA) += k8topology_64.o
obj-$(CONFIG_ACPI_NUMA) += srat_64.o
-obj-$(CONFIG_IA32_EMULATION) += mmap_32.o
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
new file mode 100644
index 0000000..b09bed8
--- /dev/null
+++ b/arch/x86/mm/mmap.c
@@ -0,0 +1,87 @@
+/*
+ * Combined x86 flexible mmap layout support
+ *
+ * Started by Ingo Molnar <mingo@...e.hu>
+ * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
+ * Copyright 2005 Andi Kleen, SuSE Labs.
+ *
+ */
+
+#include <linux/personality.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+
+/*
+ * Top of mmap area (just below the process stack).
+ *
+ * Leave an at least ~128 MB hole.
+ */
+#define MIN_GAP (128*1024*1024)
+#define MAX_GAP (TASK_SIZE/6*5)
+
+static inline unsigned long mmap_base(struct mm_struct *mm)
+{
+ unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
+ unsigned long random_factor = 0;
+
+ if (current->flags & PF_RANDOMIZE)
+ random_factor = get_random_int() % (1024*1024);
+
+ if (gap < MIN_GAP)
+ gap = MIN_GAP;
+ else if (gap > MAX_GAP)
+ gap = MAX_GAP;
+
+ return PAGE_ALIGN(TASK_SIZE - gap - random_factor);
+}
+
+/*
+ * This function, called very early during the creation of a new
+ * process VM image, sets up which VM layout function to use:
+ */
+static void ia32_pick_mmap_layout(struct mm_struct *mm)
+{
+ /*
+ * Fall back to the standard layout if the personality
+ * bit is set, or if the expected stack growth is unlimited:
+ */
+ if (sysctl_legacy_va_layout ||
+ (current->personality & ADDR_COMPAT_LAYOUT) ||
+ current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) {
+ mm->mmap_base = TASK_UNMAPPED_BASE;
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ mm->unmap_area = arch_unmap_area;
+ } else {
+ mm->mmap_base = mmap_base(mm);
+ mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ mm->unmap_area = arch_unmap_area_topdown;
+ }
+}
+
+/* TODO: move the mmap code from sys_x86_64.c over here. */
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+#ifdef CONFIG_X86_32
+ return ia32_pick_mmap_layout(mm);
+#endif
+#ifdef CONFIG_IA32_EMULATION
+ if (current_thread_info()->flags & _TIF_IA32)
+ return ia32_pick_mmap_layout(mm);
+#endif
+ mm->mmap_base = TASK_UNMAPPED_BASE;
+ if (current->flags & PF_RANDOMIZE) {
+ /*
+ * Add 28bit randomness which is about 40bits of
+ * address space because mmap base has to be page
+ * aligned. or ~1/128 of the total user VM (total
+ * user address space is 47bits)
+ */
+ unsigned rnd = get_random_int() & 0xfffffff;
+
+ mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT;
+ }
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ mm->unmap_area = arch_unmap_area;
+}
+
diff --git a/arch/x86/mm/mmap_32.c b/arch/x86/mm/mmap_32.c
deleted file mode 100644
index d490662..0000000
--- a/arch/x86/mm/mmap_32.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * linux/arch/i386/mm/mmap.c
- *
- * flexible mmap layout support
- *
- * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
- * Started by Ingo Molnar <mingo@...e.hu>
- */
-
-#include <linux/personality.h>
-#include <linux/mm.h>
-#include <linux/random.h>
-#include <linux/sched.h>
-
-/*
- * Top of mmap area (just below the process stack).
- *
- * Leave an at least ~128 MB hole.
- */
-#define MIN_GAP (128*1024*1024)
-#define MAX_GAP (TASK_SIZE/6*5)
-
-static inline unsigned long mmap_base(struct mm_struct *mm)
-{
- unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
- unsigned long random_factor = 0;
-
- if (current->flags & PF_RANDOMIZE)
- random_factor = get_random_int() % (1024*1024);
-
- if (gap < MIN_GAP)
- gap = MIN_GAP;
- else if (gap > MAX_GAP)
- gap = MAX_GAP;
-
- return PAGE_ALIGN(TASK_SIZE - gap - random_factor);
-}
-
-/*
- * This function, called very early during the creation of a new
- * process VM image, sets up which VM layout function to use:
- */
-#ifdef CONFIG_X86_32
-void arch_pick_mmap_layout(struct mm_struct *mm)
-#else
-void ia32_pick_mmap_layout(struct mm_struct *mm)
-#endif
-{
- /*
- * Fall back to the standard layout if the personality
- * bit is set, or if the expected stack growth is unlimited:
- */
- if (sysctl_legacy_va_layout ||
- (current->personality & ADDR_COMPAT_LAYOUT) ||
- current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) {
- mm->mmap_base = TASK_UNMAPPED_BASE;
- mm->get_unmapped_area = arch_get_unmapped_area;
- mm->unmap_area = arch_unmap_area;
- } else {
- mm->mmap_base = mmap_base(mm);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
- mm->unmap_area = arch_unmap_area_topdown;
- }
-}
diff --git a/arch/x86/mm/mmap_64.c b/arch/x86/mm/mmap_64.c
deleted file mode 100644
index ffb71a3..0000000
--- a/arch/x86/mm/mmap_64.c
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Copyright 2005 Andi Kleen, SuSE Labs.
- * Licensed under GPL, v.2
- */
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/random.h>
-#include <asm/ia32.h>
-
-/* Notebook: move the mmap code from sys_x86_64.c over here. */
-
-void arch_pick_mmap_layout(struct mm_struct *mm)
-{
-#ifdef CONFIG_IA32_EMULATION
- if (current_thread_info()->flags & _TIF_IA32)
- return ia32_pick_mmap_layout(mm);
-#endif
- mm->mmap_base = TASK_UNMAPPED_BASE;
- if (current->flags & PF_RANDOMIZE) {
- /*
- * Add 28bit randomness which is about 40bits of
- * address space because mmap base has to be page
- * aligned. or ~1/128 of the total user VM (total
- * user address space is 47bits)
- */
- unsigned rnd = get_random_int() & 0xfffffff;
-
- mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT;
- }
- mm->get_unmapped_area = arch_get_unmapped_area;
- mm->unmap_area = arch_unmap_area;
-}
-
--
1.5.3.7.2094.gff6c
--
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