[deliverable/linux.git] / arch / x86 / mm / debug_pagetables.c

#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <asm/pgtable.h>

static int ptdump_show(struct seq_file *m, void *v)
{
	ptdump_walk_pgd_level(m, NULL);
	return 0;
}

static int ptdump_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, ptdump_show, NULL);
}

static const struct file_operations ptdump_fops = {
	.owner		= THIS_MODULE,
	.open		= ptdump_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct dentry *pe;

static int __init pt_dump_debug_init(void)
{
	pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
				 &ptdump_fops);
	if (!pe)
		return -ENOMEM;

	return 0;
}

static void __exit pt_dump_debug_exit(void)
{
	debugfs_remove_recursive(pe);
}

module_init(pt_dump_debug_init);
module_exit(pt_dump_debug_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
Commit	Line	Data
8609d1b5 KC	1	#include <linux/debugfs.h>
	2	#include <linux/module.h>
	3	#include <linux/seq_file.h>
	4	#include <asm/pgtable.h>
	5
	6	static int ptdump_show(struct seq_file m, void v)
	7	{
	8	ptdump_walk_pgd_level(m, NULL);
	9	return 0;
	10	}
	11
	12	static int ptdump_open(struct inode inode, struct file filp)
	13	{
	14	return single_open(filp, ptdump_show, NULL);
	15	}
	16
	17	static 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
	25	static struct dentry *pe;
	26
	27	static int __init pt_dump_debug_init(void)
	28	{
071ac0c4	29	pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
8609d1b5 KC	30	&ptdump_fops);
	31	if (!pe)
	32	return -ENOMEM;
	33
	34	return 0;
	35	}
	36
	37	static void __exit pt_dump_debug_exit(void)
	38	{
	39	debugfs_remove_recursive(pe);
	40	}
	41
	42	module_init(pt_dump_debug_init);
	43	module_exit(pt_dump_debug_exit);
	44	MODULE_LICENSE("GPL");
	45	MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
	46	MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");