lib/dynamic_printk.c - kernel/msm-4.9 - Gitiles

 /*
  * lib/dynamic_printk.c
  *
  * make pr_debug()/dev_dbg() calls runtime configurable based upon their
  * their source module.
  *
  * Copyright (C) 2008 Red Hat, Inc., Jason Baron <jbaron@redhat.com>
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/uaccess.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/fs.h>

 extern struct mod_debug __start___verbose[];
 extern struct mod_debug __stop___verbose[];

 struct debug_name {
 	struct hlist_node hlist;
 	struct hlist_node hlist2;
 	int hash1;
 	int hash2;
 	char *name;
 	int enable;
 	int type;
 };

 static int nr_entries;
 static int num_enabled;
 int dynamic_enabled = DYNAMIC_ENABLED_NONE;
 static struct hlist_head module_table[DEBUG_HASH_TABLE_SIZE] =
 	{ [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
 static struct hlist_head module_table2[DEBUG_HASH_TABLE_SIZE] =
 	{ [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
 static DECLARE_MUTEX(debug_list_mutex);

 /* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
  * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
  * use independent hash functions, to reduce the chance of false positives.
  */
 long long dynamic_printk_enabled;
 EXPORT_SYMBOL_GPL(dynamic_printk_enabled);
 long long dynamic_printk_enabled2;
 EXPORT_SYMBOL_GPL(dynamic_printk_enabled2);

 /* returns the debug module pointer. */
 static struct debug_name *find_debug_module(char *module_name)
 {
 	int i;
 	struct hlist_head *head;
 	struct hlist_node *node;
 	struct debug_name *element;

 	element = NULL;
 	for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
 		head = &module_table[i];
 		hlist_for_each_entry_rcu(element, node, head, hlist)
 			if (!strcmp(element->name, module_name))
 				return element;
 	}
 	return NULL;
 }

 /* returns the debug module pointer. */
 static struct debug_name *find_debug_module_hash(char *module_name, int hash)
 {
 	struct hlist_head *head;
 	struct hlist_node *node;
 	struct debug_name *element;

 	element = NULL;
 	head = &module_table[hash];
 	hlist_for_each_entry_rcu(element, node, head, hlist)
 		if (!strcmp(element->name, module_name))
 			return element;
 	return NULL;
 }

 /* caller must hold mutex*/
 static int __add_debug_module(char *mod_name, int hash, int hash2)
 {
 	struct debug_name *new;
 	char *module_name;
 	int ret = 0;

 	if (find_debug_module(mod_name)) {
 		ret = -EINVAL;
 		goto out;
 	}
 	module_name = kmalloc(strlen(mod_name) + 1, GFP_KERNEL);
 	if (!module_name) {
 		ret = -ENOMEM;
 		goto out;
 	}
 	module_name = strcpy(module_name, mod_name);
 	module_name[strlen(mod_name)] = '\0';
 	new = kzalloc(sizeof(struct debug_name), GFP_KERNEL);
 	if (!new) {
 		kfree(module_name);
 		ret = -ENOMEM;
 		goto out;
 	}
 	INIT_HLIST_NODE(&new->hlist);
 	INIT_HLIST_NODE(&new->hlist2);
 	new->name = module_name;
 	new->hash1 = hash;
 	new->hash2 = hash2;
 	hlist_add_head_rcu(&new->hlist, &module_table[hash]);
 	hlist_add_head_rcu(&new->hlist2, &module_table2[hash2]);
 	nr_entries++;
 out:
 	return ret;
 }

 int unregister_dynamic_debug_module(char *mod_name)
 {
 	struct debug_name *element;
 	int ret = 0;

 	down(&debug_list_mutex);
 	element = find_debug_module(mod_name);
 	if (!element) {
 		ret = -EINVAL;
 		goto out;
 	}
 	hlist_del_rcu(&element->hlist);
 	hlist_del_rcu(&element->hlist2);
 	synchronize_rcu();
 	kfree(element->name);
 	if (element->enable)
 		num_enabled--;
 	kfree(element);
 	nr_entries--;
 out:
 	up(&debug_list_mutex);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(unregister_dynamic_debug_module);

 int register_dynamic_debug_module(char *mod_name, int type, char *share_name,
 					char *flags, int hash, int hash2)
 {
 	struct debug_name *elem;
 	int ret = 0;

 	down(&debug_list_mutex);
 	elem = find_debug_module(mod_name);
 	if (!elem) {
 		if (__add_debug_module(mod_name, hash, hash2))
 			goto out;
 		elem = find_debug_module(mod_name);
 		if (dynamic_enabled == DYNAMIC_ENABLED_ALL &&
 				!strcmp(mod_name, share_name)) {
 			elem->enable = true;
 			num_enabled++;
 		}
 	}
 	elem->type |= type;
 out:
 	up(&debug_list_mutex);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(register_dynamic_debug_module);

 int __dynamic_dbg_enabled_helper(char *mod_name, int type, int value, int hash)
 {
 	struct debug_name *elem;
 	int ret = 0;

 	if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
 		return 1;
 	rcu_read_lock();
 	elem = find_debug_module_hash(mod_name, hash);
 	if (elem && elem->enable)
 		ret = 1;
 	rcu_read_unlock();
 	return ret;
 }
 EXPORT_SYMBOL_GPL(__dynamic_dbg_enabled_helper);

 static void set_all(bool enable)
 {
 	struct debug_name *e;
 	struct hlist_node *node;
 	int i;
 	long long enable_mask;

 	for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
 		if (module_table[i].first != NULL) {
 			hlist_for_each_entry(e, node, &module_table[i], hlist) {
 				e->enable = enable;
 			}
 		}
 	}
 	if (enable)
 		enable_mask = ULLONG_MAX;
 	else
 		enable_mask = 0;
 	dynamic_printk_enabled = enable_mask;
 	dynamic_printk_enabled2 = enable_mask;
 }

 static int disabled_hash(int i, bool first_table)
 {
 	struct debug_name *e;
 	struct hlist_node *node;

 	if (first_table) {
 		hlist_for_each_entry(e, node, &module_table[i], hlist) {
 			if (e->enable)
 				return 0;
 		}
 	} else {
 		hlist_for_each_entry(e, node, &module_table2[i], hlist2) {
 			if (e->enable)
 				return 0;
 		}
 	}
 	return 1;
 }

 static ssize_t pr_debug_write(struct file *file, const char __user *buf,
 				size_t length, loff_t *ppos)
 {
 	char *buffer, *s, *value_str, *setting_str;
 	int err, value;
 	struct debug_name *elem = NULL;
 	int all = 0;

 	if (length > PAGE_SIZE || length < 0)
 		return -EINVAL;

 	buffer = (char *)__get_free_page(GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;

 	err = -EFAULT;
 	if (copy_from_user(buffer, buf, length))
 		goto out;

 	err = -EINVAL;
 	if (length < PAGE_SIZE)
 		buffer[length] = '\0';
 	else if (buffer[PAGE_SIZE-1])
 		goto out;

 	err = -EINVAL;
 	down(&debug_list_mutex);

 	if (strncmp("set", buffer, 3))
 		goto out_up;
 	s = buffer + 3;
 	setting_str = strsep(&s, "=");
 	if (s == NULL)
 		goto out_up;
 	setting_str = strstrip(setting_str);
 	value_str = strsep(&s, " ");
 	if (s == NULL)
 		goto out_up;
 	s = strstrip(s);
 	if (!strncmp(s, "all", 3))
 		all = 1;
 	else
 		elem = find_debug_module(s);
 	if (!strncmp(setting_str, "enable", 6)) {
 		value = !!simple_strtol(value_str, NULL, 10);
 		if (all) {
 			if (value) {
 				set_all(true);
 				num_enabled = nr_entries;
 				dynamic_enabled = DYNAMIC_ENABLED_ALL;
 			} else {
 				set_all(false);
 				num_enabled = 0;
 				dynamic_enabled = DYNAMIC_ENABLED_NONE;
 			}
 			err = 0;
 		} else if (elem) {
 			if (value && (elem->enable == 0)) {
 				dynamic_printk_enabled |= (1LL << elem->hash1);
 				dynamic_printk_enabled2 |= (1LL << elem->hash2);
 				elem->enable = 1;
 				num_enabled++;
 				dynamic_enabled = DYNAMIC_ENABLED_SOME;
 				err = 0;
 				printk(KERN_DEBUG
 					"debugging enabled for module %s\n",
 					elem->name);
 			} else if (!value && (elem->enable == 1)) {
 				elem->enable = 0;
 				num_enabled--;
 				if (disabled_hash(elem->hash1, true))
 					dynamic_printk_enabled &=
 							~(1LL << elem->hash1);
 				if (disabled_hash(elem->hash2, false))
 					dynamic_printk_enabled2 &=
 							~(1LL << elem->hash2);
 				if (num_enabled)
 					dynamic_enabled = DYNAMIC_ENABLED_SOME;
 				else
 					dynamic_enabled = DYNAMIC_ENABLED_NONE;
 				err = 0;
 				printk(KERN_DEBUG
 					"debugging disabled for module %s\n",
 					elem->name);
 			}
 		}
 	}
 	if (!err)
 		err = length;
 out_up:
 	up(&debug_list_mutex);
 out:
 	free_page((unsigned long)buffer);
 	return err;
 }

 static void *pr_debug_seq_start(struct seq_file *f, loff_t *pos)
 {
 	return (*pos < DEBUG_HASH_TABLE_SIZE) ? pos : NULL;
 }

 static void *pr_debug_seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
 	(*pos)++;
 	if (*pos >= DEBUG_HASH_TABLE_SIZE)
 		return NULL;
 	return pos;
 }

 static void pr_debug_seq_stop(struct seq_file *s, void *v)
 {
 	/* Nothing to do */
 }

 static int pr_debug_seq_show(struct seq_file *s, void *v)
 {
 	struct hlist_head *head;
 	struct hlist_node *node;
 	struct debug_name *elem;
 	unsigned int i = *(loff_t *) v;

 	rcu_read_lock();
 	head = &module_table[i];
 	hlist_for_each_entry_rcu(elem, node, head, hlist) {
 		seq_printf(s, "%s enabled=%d", elem->name, elem->enable);
 		seq_printf(s, "\n");
 	}
 	rcu_read_unlock();
 	return 0;
 }

 static struct seq_operations pr_debug_seq_ops = {
 	.start = pr_debug_seq_start,
 	.next  = pr_debug_seq_next,
 	.stop  = pr_debug_seq_stop,
 	.show  = pr_debug_seq_show
 };

 static int pr_debug_open(struct inode *inode, struct file *filp)
 {
 	return seq_open(filp, &pr_debug_seq_ops);
 }

 static const struct file_operations pr_debug_operations = {
 	.open		= pr_debug_open,
 	.read		= seq_read,
 	.write		= pr_debug_write,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 static int __init dynamic_printk_init(void)
 {
 	struct dentry *dir, *file;
 	struct mod_debug *iter;
 	unsigned long value;

 	dir = debugfs_create_dir("dynamic_printk", NULL);
 	if (!dir)
 		return -ENOMEM;
 	file = debugfs_create_file("modules", 0644, dir, NULL,
 					&pr_debug_operations);
 	if (!file) {
 		debugfs_remove(dir);
 		return -ENOMEM;
 	}
 	for (value = (unsigned long)__start___verbose;
 		value < (unsigned long)__stop___verbose;
 		value += sizeof(struct mod_debug)) {
 			iter = (struct mod_debug *)value;
 			register_dynamic_debug_module(iter->modname,
 				iter->type,
 				iter->logical_modname,
 				iter->flag_names, iter->hash, iter->hash2);
 	}
 	if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
 		set_all(true);
 	return 0;
 }
 module_init(dynamic_printk_init);
 /* may want to move this earlier so we can get traces as early as possible */

 static int __init dynamic_printk_setup(char *str)
 {
 	if (str)
 		return -ENOENT;
 	dynamic_enabled = DYNAMIC_ENABLED_ALL;
 	return 0;
 }
 /* Use early_param(), so we can get debug output as early as possible */
 early_param("dynamic_printk", dynamic_printk_setup);
	/*
	* lib/dynamic_printk.c
	*
	* make pr_debug()/dev_dbg() calls runtime configurable based upon their
	* their source module.
	*
	* Copyright (C) 2008 Red Hat, Inc., Jason Baron <jbaron@redhat.com>
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/uaccess.h>
	#include <linux/seq_file.h>
	#include <linux/debugfs.h>
	#include <linux/fs.h>

	extern struct mod_debug __start___verbose[];
	extern struct mod_debug __stop___verbose[];

	struct debug_name {
	struct hlist_node hlist;
	struct hlist_node hlist2;
	int hash1;
	int hash2;
	char *name;
	int enable;
	int type;
	};

	static int nr_entries;
	static int num_enabled;
	int dynamic_enabled = DYNAMIC_ENABLED_NONE;
	static struct hlist_head module_table[DEBUG_HASH_TABLE_SIZE] =
	{ [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
	static struct hlist_head module_table2[DEBUG_HASH_TABLE_SIZE] =
	{ [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
	static DECLARE_MUTEX(debug_list_mutex);

	/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
	* bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
	* use independent hash functions, to reduce the chance of false positives.
	*/
	long long dynamic_printk_enabled;
	EXPORT_SYMBOL_GPL(dynamic_printk_enabled);
	long long dynamic_printk_enabled2;
	EXPORT_SYMBOL_GPL(dynamic_printk_enabled2);

	/* returns the debug module pointer. */
	static struct debug_name find_debug_module(char module_name)
	{
	int i;
	struct hlist_head *head;
	struct hlist_node *node;
	struct debug_name *element;

	element = NULL;
	for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
	head = &module_table[i];
	hlist_for_each_entry_rcu(element, node, head, hlist)
	if (!strcmp(element->name, module_name))
	return element;
	}
	return NULL;
	}

	/* returns the debug module pointer. */
	static struct debug_name find_debug_module_hash(char module_name, int hash)
	{
	struct hlist_head *head;
	struct hlist_node *node;
	struct debug_name *element;

	element = NULL;
	head = &module_table[hash];
	hlist_for_each_entry_rcu(element, node, head, hlist)
	if (!strcmp(element->name, module_name))
	return element;
	return NULL;
	}

	/* caller must hold mutex*/
	static int __add_debug_module(char *mod_name, int hash, int hash2)
	{
	struct debug_name *new;
	char *module_name;
	int ret = 0;

	if (find_debug_module(mod_name)) {
	ret = -EINVAL;
	goto out;
	}
	module_name = kmalloc(strlen(mod_name) + 1, GFP_KERNEL);
	if (!module_name) {
	ret = -ENOMEM;
	goto out;
	}
	module_name = strcpy(module_name, mod_name);
	module_name[strlen(mod_name)] = '\0';
	new = kzalloc(sizeof(struct debug_name), GFP_KERNEL);
	if (!new) {
	kfree(module_name);
	ret = -ENOMEM;
	goto out;
	}
	INIT_HLIST_NODE(&new->hlist);
	INIT_HLIST_NODE(&new->hlist2);
	new->name = module_name;
	new->hash1 = hash;
	new->hash2 = hash2;
	hlist_add_head_rcu(&new->hlist, &module_table[hash]);
	hlist_add_head_rcu(&new->hlist2, &module_table2[hash2]);
	nr_entries++;
	out:
	return ret;
	}

	int unregister_dynamic_debug_module(char *mod_name)
	{
	struct debug_name *element;
	int ret = 0;

	down(&debug_list_mutex);
	element = find_debug_module(mod_name);
	if (!element) {
	ret = -EINVAL;
	goto out;
	}
	hlist_del_rcu(&element->hlist);
	hlist_del_rcu(&element->hlist2);
	synchronize_rcu();
	kfree(element->name);
	if (element->enable)
	num_enabled--;
	kfree(element);
	nr_entries--;
	out:
	up(&debug_list_mutex);
	return ret;
	}
	EXPORT_SYMBOL_GPL(unregister_dynamic_debug_module);

	int register_dynamic_debug_module(char mod_name, int type, char share_name,
	char *flags, int hash, int hash2)
	{
	struct debug_name *elem;
	int ret = 0;

	down(&debug_list_mutex);
	elem = find_debug_module(mod_name);
	if (!elem) {
	if (__add_debug_module(mod_name, hash, hash2))
	goto out;
	elem = find_debug_module(mod_name);
	if (dynamic_enabled == DYNAMIC_ENABLED_ALL &&
	!strcmp(mod_name, share_name)) {
	elem->enable = true;
	num_enabled++;
	}
	}
	elem->type \|= type;
	out:
	up(&debug_list_mutex);
	return ret;
	}
	EXPORT_SYMBOL_GPL(register_dynamic_debug_module);

	int __dynamic_dbg_enabled_helper(char *mod_name, int type, int value, int hash)
	{
	struct debug_name *elem;
	int ret = 0;

	if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
	return 1;
	rcu_read_lock();
	elem = find_debug_module_hash(mod_name, hash);
	if (elem && elem->enable)
	ret = 1;
	rcu_read_unlock();
	return ret;
	}
	EXPORT_SYMBOL_GPL(__dynamic_dbg_enabled_helper);

	static void set_all(bool enable)
	{
	struct debug_name *e;
	struct hlist_node *node;
	int i;
	long long enable_mask;

	for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
	if (module_table[i].first != NULL) {
	hlist_for_each_entry(e, node, &module_table[i], hlist) {
	e->enable = enable;
	}
	}
	}
	if (enable)
	enable_mask = ULLONG_MAX;
	else
	enable_mask = 0;
	dynamic_printk_enabled = enable_mask;
	dynamic_printk_enabled2 = enable_mask;
	}

	static int disabled_hash(int i, bool first_table)
	{
	struct debug_name *e;
	struct hlist_node *node;

	if (first_table) {
	hlist_for_each_entry(e, node, &module_table[i], hlist) {
	if (e->enable)
	return 0;
	}
	} else {
	hlist_for_each_entry(e, node, &module_table2[i], hlist2) {
	if (e->enable)
	return 0;
	}
	}
	return 1;
	}

	static ssize_t pr_debug_write(struct file file, const char __user buf,
	size_t length, loff_t *ppos)
	{
	char buffer, s, value_str, setting_str;
	int err, value;
	struct debug_name *elem = NULL;
	int all = 0;

	if (length > PAGE_SIZE \|\| length < 0)
	return -EINVAL;

	buffer = (char *)__get_free_page(GFP_KERNEL);
	if (!buffer)
	return -ENOMEM;

	err = -EFAULT;
	if (copy_from_user(buffer, buf, length))
	goto out;

	err = -EINVAL;
	if (length < PAGE_SIZE)
	buffer[length] = '\0';
	else if (buffer[PAGE_SIZE-1])
	goto out;

	err = -EINVAL;
	down(&debug_list_mutex);

	if (strncmp("set", buffer, 3))
	goto out_up;
	s = buffer + 3;
	setting_str = strsep(&s, "=");
	if (s == NULL)
	goto out_up;
	setting_str = strstrip(setting_str);
	value_str = strsep(&s, " ");
	if (s == NULL)
	goto out_up;
	s = strstrip(s);
	if (!strncmp(s, "all", 3))
	all = 1;
	else
	elem = find_debug_module(s);
	if (!strncmp(setting_str, "enable", 6)) {
	value = !!simple_strtol(value_str, NULL, 10);
	if (all) {
	if (value) {
	set_all(true);
	num_enabled = nr_entries;
	dynamic_enabled = DYNAMIC_ENABLED_ALL;
	} else {
	set_all(false);
	num_enabled = 0;
	dynamic_enabled = DYNAMIC_ENABLED_NONE;
	}
	err = 0;
	} else if (elem) {
	if (value && (elem->enable == 0)) {
	dynamic_printk_enabled \|= (1LL << elem->hash1);
	dynamic_printk_enabled2 \|= (1LL << elem->hash2);
	elem->enable = 1;
	num_enabled++;
	dynamic_enabled = DYNAMIC_ENABLED_SOME;
	err = 0;
	printk(KERN_DEBUG
	"debugging enabled for module %s\n",
	elem->name);
	} else if (!value && (elem->enable == 1)) {
	elem->enable = 0;
	num_enabled--;
	if (disabled_hash(elem->hash1, true))
	dynamic_printk_enabled &=
	~(1LL << elem->hash1);
	if (disabled_hash(elem->hash2, false))
	dynamic_printk_enabled2 &=
	~(1LL << elem->hash2);
	if (num_enabled)
	dynamic_enabled = DYNAMIC_ENABLED_SOME;
	else
	dynamic_enabled = DYNAMIC_ENABLED_NONE;
	err = 0;
	printk(KERN_DEBUG
	"debugging disabled for module %s\n",
	elem->name);
	}
	}
	}
	if (!err)
	err = length;
	out_up:
	up(&debug_list_mutex);
	out:
	free_page((unsigned long)buffer);
	return err;
	}

	static void pr_debug_seq_start(struct seq_file f, loff_t *pos)
	{
	return (*pos < DEBUG_HASH_TABLE_SIZE) ? pos : NULL;
	}

	static void pr_debug_seq_next(struct seq_file s, void v, loff_t pos)
	{
	(*pos)++;
	if (*pos >= DEBUG_HASH_TABLE_SIZE)
	return NULL;
	return pos;
	}

	static void pr_debug_seq_stop(struct seq_file s, void v)
	{
	/* Nothing to do */
	}

	static int pr_debug_seq_show(struct seq_file s, void v)
	{
	struct hlist_head *head;
	struct hlist_node *node;
	struct debug_name *elem;
	unsigned int i = (loff_t ) v;

	rcu_read_lock();
	head = &module_table[i];
	hlist_for_each_entry_rcu(elem, node, head, hlist) {
	seq_printf(s, "%s enabled=%d", elem->name, elem->enable);
	seq_printf(s, "\n");
	}
	rcu_read_unlock();
	return 0;
	}

	static struct seq_operations pr_debug_seq_ops = {
	.start = pr_debug_seq_start,
	.next = pr_debug_seq_next,
	.stop = pr_debug_seq_stop,
	.show = pr_debug_seq_show
	};

	static int pr_debug_open(struct inode inode, struct file filp)
	{
	return seq_open(filp, &pr_debug_seq_ops);
	}

	static const struct file_operations pr_debug_operations = {
	.open = pr_debug_open,
	.read = seq_read,
	.write = pr_debug_write,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	static int __init dynamic_printk_init(void)
	{
	struct dentry dir, file;
	struct mod_debug *iter;
	unsigned long value;

	dir = debugfs_create_dir("dynamic_printk", NULL);
	if (!dir)
	return -ENOMEM;
	file = debugfs_create_file("modules", 0644, dir, NULL,
	&pr_debug_operations);
	if (!file) {
	debugfs_remove(dir);
	return -ENOMEM;
	}
	for (value = (unsigned long)__start___verbose;
	value < (unsigned long)__stop___verbose;
	value += sizeof(struct mod_debug)) {
	iter = (struct mod_debug *)value;
	register_dynamic_debug_module(iter->modname,
	iter->type,
	iter->logical_modname,
	iter->flag_names, iter->hash, iter->hash2);
	}
	if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
	set_all(true);
	return 0;
	}
	module_init(dynamic_printk_init);
	/* may want to move this earlier so we can get traces as early as possible */

	static int __init dynamic_printk_setup(char *str)
	{
	if (str)
	return -ENOENT;
	dynamic_enabled = DYNAMIC_ENABLED_ALL;
	return 0;
	}
	/* Use early_param(), so we can get debug output as early as possible */
	early_param("dynamic_printk", dynamic_printk_setup);