1#include <linux/debugfs.h>
 2#include <linux/module.h>
 3#include <linux/seq_file.h>
 4#include <asm/pgtable.h>
 5
 6static int ptdump_show(struct seq_file *m, void *v)
 7{
 8	ptdump_walk_pgd_level(m, NULL);
 9	return 0;
10}
11
12static int ptdump_open(struct inode *inode, struct file *filp)
13{
14	return single_open(filp, ptdump_show, NULL);
15}
16
17static const struct file_operations ptdump_fops = {
18	.owner		= THIS_MODULE,
19	.open		= ptdump_open,
20	.read		= seq_read,
21	.llseek		= seq_lseek,
22	.release	= single_release,
23};
24
25static struct dentry *pe;
26
27static int __init pt_dump_debug_init(void)
28{
29	pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
30				 &ptdump_fops);
31	if (!pe)
32		return -ENOMEM;
33
34	return 0;
35}
36
37static void __exit pt_dump_debug_exit(void)
38{
39	debugfs_remove_recursive(pe);
40}
41
42module_init(pt_dump_debug_init);
43module_exit(pt_dump_debug_exit);
44MODULE_LICENSE("GPL");
45MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
46MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");