[lttng-modules.git] / probes / lttng-kretprobes.c

/*
* probes/lttng-kretprobes.c
 *
 * LTTng kretprobes integration module.
 *
 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/slab.h>
#include <linux/kref.h>
#include <lttng-events.h>
#include <wrapper/ringbuffer/frontend_types.h>
#include <wrapper/vmalloc.h>
#include <wrapper/irqflags.h>
#include <lttng-tracer.h>
#include <blacklist/kprobes.h>

enum lttng_kretprobe_type {
	EVENT_ENTRY = 0,
	EVENT_RETURN = 1,
};

struct lttng_krp {
	struct kretprobe krp;
	struct lttng_event *event[2];	/* ENTRY and RETURN */
	struct kref kref_register;
	struct kref kref_alloc;
};

static
int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
			      struct pt_regs *regs,
			      enum lttng_kretprobe_type type)
{
	struct lttng_krp *lttng_krp =
		container_of(krpi->rp, struct lttng_krp, krp);
	struct lttng_event *event =
		lttng_krp->event[type];
	struct lttng_probe_ctx lttng_probe_ctx = {
		.event = event,
		.interruptible = !lttng_regs_irqs_disabled(regs),
	};
	struct lttng_channel *chan = event->chan;
	struct lib_ring_buffer_ctx ctx;
	int ret;
	struct {
		unsigned long ip;
		unsigned long parent_ip;
	} payload;

	if (unlikely(!READ_ONCE(chan->session->active)))
		return 0;
	if (unlikely(!READ_ONCE(chan->enabled)))
		return 0;
	if (unlikely(!READ_ONCE(event->enabled)))
		return 0;

	payload.ip = (unsigned long) krpi->rp->kp.addr;
	payload.parent_ip = (unsigned long) krpi->ret_addr;

	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
				 lttng_alignof(payload), -1);
	ret = chan->ops->event_reserve(&ctx, event->id);
	if (ret < 0)
		return 0;
	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	chan->ops->event_commit(&ctx);
	return 0;
}

static
int lttng_kretprobes_handler_entry(struct kretprobe_instance *krpi,
				   struct pt_regs *regs)
{
	return _lttng_kretprobes_handler(krpi, regs, EVENT_ENTRY);
}

static
int lttng_kretprobes_handler_return(struct kretprobe_instance *krpi,
				    struct pt_regs *regs)
{
	return _lttng_kretprobes_handler(krpi, regs, EVENT_RETURN);
}

/*
 * Create event description
 */
static
int lttng_create_kprobe_event(const char *name, struct lttng_event *event,
			      enum lttng_kretprobe_type type)
{
	struct lttng_event_field *fields;
	struct lttng_event_desc *desc;
	int ret;
	char *alloc_name;
	size_t name_len;
	const char *suffix = NULL;

	desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	name_len = strlen(name);
	switch (type) {
	case EVENT_ENTRY:
		suffix = "_entry";
		break;
	case EVENT_RETURN:
		suffix = "_return";
		break;
	}
	name_len += strlen(suffix);
	alloc_name = kmalloc(name_len + 1, GFP_KERNEL);
	if (!alloc_name) {
		ret = -ENOMEM;
		goto error_str;
	}
	strcpy(alloc_name, name);
	strcat(alloc_name, suffix);
	desc->name = alloc_name;
	desc->nr_fields = 2;
	desc->fields = fields =
		kzalloc(2 * sizeof(struct lttng_event_field), GFP_KERNEL);
	if (!desc->fields) {
		ret = -ENOMEM;
		goto error_fields;
	}
	fields[0].name = "ip";
	fields[0].type.atype = atype_integer;
	fields[0].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
	fields[0].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
	fields[0].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
	fields[0].type.u.basic.integer.reverse_byte_order = 0;
	fields[0].type.u.basic.integer.base = 16;
	fields[0].type.u.basic.integer.encoding = lttng_encode_none;

	fields[1].name = "parent_ip";
	fields[1].type.atype = atype_integer;
	fields[1].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
	fields[1].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
	fields[1].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
	fields[1].type.u.basic.integer.reverse_byte_order = 0;
	fields[1].type.u.basic.integer.base = 16;
	fields[1].type.u.basic.integer.encoding = lttng_encode_none;

	desc->owner = THIS_MODULE;
	event->desc = desc;

	return 0;

error_fields:
	kfree(desc->name);
error_str:
	kfree(desc);
	return ret;
}

int lttng_kretprobes_register(const char *name,
			   const char *symbol_name,
			   uint64_t offset,
			   uint64_t addr,
			   struct lttng_event *event_entry,
			   struct lttng_event *event_return)
{
	int ret;
	struct lttng_krp *lttng_krp;

	/* Kprobes expects a NULL symbol name if unused */
	if (symbol_name[0] == '\0')
		symbol_name = NULL;

	ret = lttng_create_kprobe_event(name, event_entry, EVENT_ENTRY);
	if (ret)
		goto error;
	ret = lttng_create_kprobe_event(name, event_return, EVENT_RETURN);
	if (ret)
		goto event_return_error;
	lttng_krp = kzalloc(sizeof(*lttng_krp), GFP_KERNEL);
	if (!lttng_krp)
		goto krp_error;
	lttng_krp->krp.entry_handler = lttng_kretprobes_handler_entry;
	lttng_krp->krp.handler = lttng_kretprobes_handler_return;
	if (symbol_name) {
		char *alloc_symbol;

		alloc_symbol = kstrdup(symbol_name, GFP_KERNEL);
		if (!alloc_symbol) {
			ret = -ENOMEM;
			goto name_error;
		}
		lttng_krp->krp.kp.symbol_name =
			alloc_symbol;
		event_entry->u.kretprobe.symbol_name =
			alloc_symbol;
		event_return->u.kretprobe.symbol_name =
			alloc_symbol;
	}
	lttng_krp->krp.kp.offset = offset;
	lttng_krp->krp.kp.addr = (void *) (unsigned long) addr;

	/* Allow probe handler to find event structures */
	lttng_krp->event[EVENT_ENTRY] = event_entry;
	lttng_krp->event[EVENT_RETURN] = event_return;
	event_entry->u.kretprobe.lttng_krp = lttng_krp;
	event_return->u.kretprobe.lttng_krp = lttng_krp;

	/*
	 * Both events must be unregistered before the kretprobe is
	 * unregistered. Same for memory allocation.
	 */
	kref_init(&lttng_krp->kref_alloc);
	kref_get(&lttng_krp->kref_alloc);	/* inc refcount to 2, no overflow. */
	kref_init(&lttng_krp->kref_register);
	kref_get(&lttng_krp->kref_register);	/* inc refcount to 2, no overflow. */

	/*
	 * Ensure the memory we just allocated don't trigger page faults.
	 * Well.. kprobes itself puts the page fault handler on the blacklist,
	 * but we can never be too careful.
	 */
	wrapper_vmalloc_sync_all();

	ret = register_kretprobe(&lttng_krp->krp);
	if (ret)
		goto register_error;
	return 0;

register_error:
	kfree(lttng_krp->krp.kp.symbol_name);
name_error:
	kfree(lttng_krp);
krp_error:
	kfree(event_return->desc->fields);
	kfree(event_return->desc->name);
	kfree(event_return->desc);
event_return_error:
	kfree(event_entry->desc->fields);
	kfree(event_entry->desc->name);
	kfree(event_entry->desc);
error:
	return ret;
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_register);

static
void _lttng_kretprobes_unregister_release(struct kref *kref)
{
	struct lttng_krp *lttng_krp =
		container_of(kref, struct lttng_krp, kref_register);
	unregister_kretprobe(&lttng_krp->krp);
}

void lttng_kretprobes_unregister(struct lttng_event *event)
{
	kref_put(&event->u.kretprobe.lttng_krp->kref_register,
		_lttng_kretprobes_unregister_release);
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_unregister);

static
void _lttng_kretprobes_release(struct kref *kref)
{
	struct lttng_krp *lttng_krp =
		container_of(kref, struct lttng_krp, kref_alloc);
	kfree(lttng_krp->krp.kp.symbol_name);
}

void lttng_kretprobes_destroy_private(struct lttng_event *event)
{
	kfree(event->desc->fields);
	kfree(event->desc->name);
	kfree(event->desc);
	kref_put(&event->u.kretprobe.lttng_krp->kref_alloc,
		_lttng_kretprobes_release);
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_destroy_private);

int lttng_kretprobes_event_enable_state(struct lttng_event *event,
		int enable)
{
	struct lttng_event *event_return;
	struct lttng_krp *lttng_krp;

	if (event->instrumentation != LTTNG_KERNEL_KRETPROBE) {
		return -EINVAL;
	}
	if (event->enabled == enable) {
		return -EBUSY;
	}
	lttng_krp = event->u.kretprobe.lttng_krp;
	event_return = lttng_krp->event[EVENT_RETURN];
	WRITE_ONCE(event->enabled, enable);
	WRITE_ONCE(event_return->enabled, enable);
	return 0;
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Linux Trace Toolkit Kretprobes Support");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	LTTNG_MODULES_EXTRAVERSION);
Commit	Line	Data
7371f44c	1	/*
ccecf3fb	2	* probes/lttng-kretprobes.c
7371f44c MD	3	*
	4	* LTTng kretprobes integration module.
	5	*
886d51a3 MD	6	* Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; only
	11	* version 2.1 of the License.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
7371f44c MD	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/kprobes.h>
	25	#include <linux/slab.h>
	26	#include <linux/kref.h>
156a3977 MD	27	#include <lttng-events.h>
	28	#include <wrapper/ringbuffer/frontend_types.h>
	29	#include <wrapper/vmalloc.h>
	30	#include <wrapper/irqflags.h>
	31	#include <lttng-tracer.h>
2d16de12	32	#include <blacklist/kprobes.h>
7371f44c MD	33
	34	enum lttng_kretprobe_type {
	35	EVENT_ENTRY = 0,
	36	EVENT_RETURN = 1,
	37	};
	38
	39	struct lttng_krp {
	40	struct kretprobe krp;
a90917c3	41	struct lttng_event event[2]; / ENTRY and RETURN */
7371f44c MD	42	struct kref kref_register;
	43	struct kref kref_alloc;
	44	};
	45
	46	static
	47	int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
	48	struct pt_regs *regs,
	49	enum lttng_kretprobe_type type)
	50	{
	51	struct lttng_krp *lttng_krp =
	52	container_of(krpi->rp, struct lttng_krp, krp);
a90917c3	53	struct lttng_event *event =
7371f44c	54	lttng_krp->event[type];
79150a49 JD	55	struct lttng_probe_ctx lttng_probe_ctx = {
79150a49 JD	56	.event = event,
ccecf3fb	57	.interruptible = !lttng_regs_irqs_disabled(regs),
79150a49	58	};
a90917c3	59	struct lttng_channel *chan = event->chan;
7371f44c MD	60	struct lib_ring_buffer_ctx ctx;
	61	int ret;
	62	struct {
	63	unsigned long ip;
	64	unsigned long parent_ip;
	65	} payload;
	66
acb98454	67	if (unlikely(!READ_ONCE(chan->session->active)))
7371f44c	68	return 0;
acb98454	69	if (unlikely(!READ_ONCE(chan->enabled)))
7371f44c	70	return 0;
acb98454	71	if (unlikely(!READ_ONCE(event->enabled)))
7371f44c MD	72	return 0;
	73
	74	payload.ip = (unsigned long) krpi->rp->kp.addr;
	75	payload.parent_ip = (unsigned long) krpi->ret_addr;
	76
79150a49	77	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
a90917c3	78	lttng_alignof(payload), -1);
7371f44c MD	79	ret = chan->ops->event_reserve(&ctx, event->id);
	80	if (ret < 0)
	81	return 0;
a90917c3	82	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
7371f44c MD	83	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	84	chan->ops->event_commit(&ctx);
	85	return 0;
	86	}
	87
	88	static
	89	int lttng_kretprobes_handler_entry(struct kretprobe_instance *krpi,
	90	struct pt_regs *regs)
	91	{
	92	return _lttng_kretprobes_handler(krpi, regs, EVENT_ENTRY);
	93	}
	94
	95	static
	96	int lttng_kretprobes_handler_return(struct kretprobe_instance *krpi,
	97	struct pt_regs *regs)
	98	{
	99	return _lttng_kretprobes_handler(krpi, regs, EVENT_RETURN);
	100	}
	101
	102	/*
	103	* Create event description
	104	*/
	105	static
a90917c3	106	int lttng_create_kprobe_event(const char name, struct lttng_event event,
7371f44c MD	107	enum lttng_kretprobe_type type)
	108	{
	109	struct lttng_event_field *fields;
	110	struct lttng_event_desc *desc;
	111	int ret;
	112	char *alloc_name;
	113	size_t name_len;
	114	const char *suffix = NULL;
	115
	116	desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
	117	if (!desc)
	118	return -ENOMEM;
	119	name_len = strlen(name);
	120	switch (type) {
	121	case EVENT_ENTRY:
	122	suffix = "_entry";
	123	break;
	124	case EVENT_RETURN:
	125	suffix = "_return";
	126	break;
	127	}
	128	name_len += strlen(suffix);
	129	alloc_name = kmalloc(name_len + 1, GFP_KERNEL);
	130	if (!alloc_name) {
	131	ret = -ENOMEM;
	132	goto error_str;
	133	}
	134	strcpy(alloc_name, name);
	135	strcat(alloc_name, suffix);
	136	desc->name = alloc_name;
	137	desc->nr_fields = 2;
	138	desc->fields = fields =
	139	kzalloc(2 * sizeof(struct lttng_event_field), GFP_KERNEL);
	140	if (!desc->fields) {
	141	ret = -ENOMEM;
	142	goto error_fields;
	143	}
	144	fields[0].name = "ip";
	145	fields[0].type.atype = atype_integer;
	146	fields[0].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
a90917c3	147	fields[0].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
06254b0f	148	fields[0].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
7371f44c MD	149	fields[0].type.u.basic.integer.reverse_byte_order = 0;
	150	fields[0].type.u.basic.integer.base = 16;
	151	fields[0].type.u.basic.integer.encoding = lttng_encode_none;
	152
	153	fields[1].name = "parent_ip";
	154	fields[1].type.atype = atype_integer;
	155	fields[1].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
a90917c3	156	fields[1].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
06254b0f	157	fields[1].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
7371f44c MD	158	fields[1].type.u.basic.integer.reverse_byte_order = 0;
	159	fields[1].type.u.basic.integer.base = 16;
	160	fields[1].type.u.basic.integer.encoding = lttng_encode_none;
	161
	162	desc->owner = THIS_MODULE;
	163	event->desc = desc;
	164
	165	return 0;
	166
	167	error_fields:
	168	kfree(desc->name);
	169	error_str:
	170	kfree(desc);
	171	return ret;
	172	}
	173
	174	int lttng_kretprobes_register(const char *name,
	175	const char *symbol_name,
	176	uint64_t offset,
	177	uint64_t addr,
a90917c3 MD	178	struct lttng_event *event_entry,
a90917c3 MD	179	struct lttng_event *event_return)
7371f44c MD	180	{
	181	int ret;
	182	struct lttng_krp *lttng_krp;
	183
	184	/* Kprobes expects a NULL symbol name if unused */
	185	if (symbol_name[0] == '\0')
	186	symbol_name = NULL;
	187
	188	ret = lttng_create_kprobe_event(name, event_entry, EVENT_ENTRY);
	189	if (ret)
	190	goto error;
	191	ret = lttng_create_kprobe_event(name, event_return, EVENT_RETURN);
	192	if (ret)
	193	goto event_return_error;
	194	lttng_krp = kzalloc(sizeof(*lttng_krp), GFP_KERNEL);
	195	if (!lttng_krp)
	196	goto krp_error;
	197	lttng_krp->krp.entry_handler = lttng_kretprobes_handler_entry;
	198	lttng_krp->krp.handler = lttng_kretprobes_handler_return;
	199	if (symbol_name) {
	200	char *alloc_symbol;
	201
	202	alloc_symbol = kstrdup(symbol_name, GFP_KERNEL);
	203	if (!alloc_symbol) {
	204	ret = -ENOMEM;
	205	goto name_error;
	206	}
	207	lttng_krp->krp.kp.symbol_name =
	208	alloc_symbol;
	209	event_entry->u.kretprobe.symbol_name =
	210	alloc_symbol;
	211	event_return->u.kretprobe.symbol_name =
	212	alloc_symbol;
	213	}
	214	lttng_krp->krp.kp.offset = offset;
b2c4e8fb	215	lttng_krp->krp.kp.addr = (void *) (unsigned long) addr;
7371f44c MD	216
	217	/* Allow probe handler to find event structures */
	218	lttng_krp->event[EVENT_ENTRY] = event_entry;
	219	lttng_krp->event[EVENT_RETURN] = event_return;
	220	event_entry->u.kretprobe.lttng_krp = lttng_krp;
	221	event_return->u.kretprobe.lttng_krp = lttng_krp;
	222
	223	/*
	224	* Both events must be unregistered before the kretprobe is
	225	* unregistered. Same for memory allocation.
	226	*/
	227	kref_init(&lttng_krp->kref_alloc);
9c1f4643	228	kref_get(&lttng_krp->kref_alloc); /* inc refcount to 2, no overflow. */
7371f44c	229	kref_init(&lttng_krp->kref_register);
9c1f4643	230	kref_get(&lttng_krp->kref_register); /* inc refcount to 2, no overflow. */
7371f44c MD	231
	232	/*
	233	* Ensure the memory we just allocated don't trigger page faults.
	234	* Well.. kprobes itself puts the page fault handler on the blacklist,
	235	* but we can never be too careful.
	236	*/
	237	wrapper_vmalloc_sync_all();
	238
	239	ret = register_kretprobe(&lttng_krp->krp);
	240	if (ret)
	241	goto register_error;
	242	return 0;
	243
	244	register_error:
	245	kfree(lttng_krp->krp.kp.symbol_name);
	246	name_error:
	247	kfree(lttng_krp);
	248	krp_error:
	249	kfree(event_return->desc->fields);
	250	kfree(event_return->desc->name);
	251	kfree(event_return->desc);
	252	event_return_error:
	253	kfree(event_entry->desc->fields);
	254	kfree(event_entry->desc->name);
	255	kfree(event_entry->desc);
	256	error:
	257	return ret;
	258	}
	259	EXPORT_SYMBOL_GPL(lttng_kretprobes_register);
	260
	261	static
	262	void _lttng_kretprobes_unregister_release(struct kref *kref)
	263	{
	264	struct lttng_krp *lttng_krp =
	265	container_of(kref, struct lttng_krp, kref_register);
	266	unregister_kretprobe(&lttng_krp->krp);
	267	}
	268
a90917c3	269	void lttng_kretprobes_unregister(struct lttng_event *event)
7371f44c MD	270	{
	271	kref_put(&event->u.kretprobe.lttng_krp->kref_register,
	272	_lttng_kretprobes_unregister_release);
	273	}
	274	EXPORT_SYMBOL_GPL(lttng_kretprobes_unregister);
	275
	276	static
	277	void _lttng_kretprobes_release(struct kref *kref)
	278	{
	279	struct lttng_krp *lttng_krp =
	280	container_of(kref, struct lttng_krp, kref_alloc);
	281	kfree(lttng_krp->krp.kp.symbol_name);
	282	}
	283
a90917c3	284	void lttng_kretprobes_destroy_private(struct lttng_event *event)
7371f44c MD	285	{
	286	kfree(event->desc->fields);
	287	kfree(event->desc->name);
	288	kfree(event->desc);
	289	kref_put(&event->u.kretprobe.lttng_krp->kref_alloc,
	290	_lttng_kretprobes_release);
	291	}
	292	EXPORT_SYMBOL_GPL(lttng_kretprobes_destroy_private);
	293
a0493bef MD	294	int lttng_kretprobes_event_enable_state(struct lttng_event *event,
	295	int enable)
	296	{
	297	struct lttng_event *event_return;
	298	struct lttng_krp *lttng_krp;
	299
	300	if (event->instrumentation != LTTNG_KERNEL_KRETPROBE) {
	301	return -EINVAL;
	302	}
	303	if (event->enabled == enable) {
	304	return -EBUSY;
	305	}
	306	lttng_krp = event->u.kretprobe.lttng_krp;
	307	event_return = lttng_krp->event[EVENT_RETURN];
acb98454 MJ	308	WRITE_ONCE(event->enabled, enable);
acb98454 MJ	309	WRITE_ONCE(event_return->enabled, enable);
a0493bef MD	310	return 0;
	311	}
	312	EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);
	313
7371f44c MD	314	MODULE_LICENSE("GPL and additional rights");
	315	MODULE_AUTHOR("Mathieu Desnoyers");
	316	MODULE_DESCRIPTION("Linux Trace Toolkit Kretprobes Support");
13ab8b0a MD	317	MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	318	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	319	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	320	LTTNG_MODULES_EXTRAVERSION);