LXR linux/arch/x86/mm/debug

   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");
  47