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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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/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 <linux/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 region to a sequenced file
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*/
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static int nommu_region_show(struct seq_file *m, struct vm_region *region)
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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;
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flags = region->vm_flags;
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file = region->vm_file;
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if (file) {
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struct inode *inode = file_inode(region->vm_file);
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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_setwidth(m, 25 + sizeof(void *) * 6 - 1);
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seq_printf(m,
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"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
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region->vm_start,
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region->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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((loff_t)region->vm_pgoff) << PAGE_SHIFT,
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MAJOR(dev), MINOR(dev), ino);
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if (file) {
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seq_pad(m, ' ');
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seq_file_path(m, file, "");
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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 REGIONs the kernel knows about
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* - nommu kernels have a single flat list
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*/
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static int nommu_region_list_show(struct seq_file *m, void *_p)
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{
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struct rb_node *p = _p;
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return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
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}
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static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
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{
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struct rb_node *p;
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loff_t pos = *_pos;
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down_read(&nommu_region_sem);
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for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
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if (pos-- == 0)
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return p;
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return NULL;
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}
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static void nommu_region_list_stop(struct seq_file *m, void *v)
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{
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up_read(&nommu_region_sem);
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}
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static void *nommu_region_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 const struct seq_operations proc_nommu_region_list_seqop = {
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.start = nommu_region_list_start,
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.next = nommu_region_list_next,
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.stop = nommu_region_list_stop,
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.show = nommu_region_list_show
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};
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static int __init proc_nommu_init(void)
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{
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proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
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return 0;
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}
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fs_initcall(proc_nommu_init);
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