00977a59b9
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/* nommu.c: mmu-less memory info files
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mman.h>
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#include <linux/proc_fs.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/seq_file.h>
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#include <linux/hugetlb.h>
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#include <linux/vmalloc.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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#include <asm/div64.h>
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#include "internal.h"
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/*
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* display a single VMA to a sequenced file
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*/
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int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
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{
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unsigned long ino = 0;
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struct file *file;
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dev_t dev = 0;
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int flags, len;
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flags = vma->vm_flags;
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file = vma->vm_file;
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if (file) {
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struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
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dev = inode->i_sb->s_dev;
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ino = inode->i_ino;
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}
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seq_printf(m,
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"%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
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vma->vm_start,
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vma->vm_end,
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flags & VM_READ ? 'r' : '-',
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flags & VM_WRITE ? 'w' : '-',
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flags & VM_EXEC ? 'x' : '-',
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flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
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vma->vm_pgoff << PAGE_SHIFT,
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MAJOR(dev), MINOR(dev), ino, &len);
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if (file) {
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len = 25 + sizeof(void *) * 6 - len;
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if (len < 1)
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len = 1;
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seq_printf(m, "%*c", len, ' ');
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seq_path(m, file->f_path.mnt, file->f_path.dentry, "");
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}
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seq_putc(m, '\n');
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return 0;
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}
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/*
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* display a list of all the VMAs the kernel knows about
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* - nommu kernals have a single flat list
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*/
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static int nommu_vma_list_show(struct seq_file *m, void *v)
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{
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struct vm_area_struct *vma;
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vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
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return nommu_vma_show(m, vma);
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}
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static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
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{
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struct rb_node *_rb;
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loff_t pos = *_pos;
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void *next = NULL;
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down_read(&nommu_vma_sem);
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for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {
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if (pos == 0) {
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next = _rb;
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break;
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}
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pos--;
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}
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return next;
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}
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static void nommu_vma_list_stop(struct seq_file *m, void *v)
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{
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up_read(&nommu_vma_sem);
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}
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static void *nommu_vma_list_next(struct seq_file *m, void *v, loff_t *pos)
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{
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(*pos)++;
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return rb_next((struct rb_node *) v);
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}
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static struct seq_operations proc_nommu_vma_list_seqop = {
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.start = nommu_vma_list_start,
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.next = nommu_vma_list_next,
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.stop = nommu_vma_list_stop,
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.show = nommu_vma_list_show
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};
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static int proc_nommu_vma_list_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &proc_nommu_vma_list_seqop);
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}
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static const struct file_operations proc_nommu_vma_list_operations = {
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.open = proc_nommu_vma_list_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int __init proc_nommu_init(void)
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{
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create_seq_entry("maps", S_IRUGO, &proc_nommu_vma_list_operations);
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return 0;
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}
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module_init(proc_nommu_init);
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