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

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * probes/lttng-kretprobes.c
 *
 * LTTng kretprobes integration module.
 *
 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/module.h>
#include <wrapper/kprobes.h>
#include <linux/slab.h>
#include <linux/kref.h>
#include <lttng/events.h>
#include <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_EXIT	= 1,
};

struct lttng_krp {
	struct kretprobe krp;
	struct lttng_event *event[2];	/* ENTRY and EXIT */
	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(lttng_get_kretprobe(krpi), 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(!LTTNG_READ_ONCE(chan->session->active)))
		return 0;
	if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
		return 0;
	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
		return 0;

	payload.ip = (unsigned long) lttng_get_kretprobe(krpi)->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_exit(struct kretprobe_instance *krpi,
				  struct pt_regs *regs)
{
	return _lttng_kretprobes_handler(krpi, regs, EVENT_EXIT);
}

static const struct lttng_kernel_type_common *event_type =
	lttng_kernel_static_type_integer_from_type(unsigned long, __BYTE_ORDER, 16);

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

	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	name_len = strlen(name);
	switch (type) {
	case EVENT_ENTRY:
		suffix = "_entry";
		break;
	case EVENT_EXIT:
		suffix = "_exit";
		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->event_name = alloc_name;
	desc->nr_fields = 2;
	fieldp_array = kzalloc(desc->nr_fields * sizeof(struct lttng_kernel_event_field *), GFP_KERNEL);
	if (!fieldp_array) {
		ret = -ENOMEM;
		goto error_fieldp_array;
	}
	desc->fields = fieldp_array;

	field = kzalloc(sizeof(struct lttng_kernel_event_field), GFP_KERNEL);
	if (!field) {
		ret = -ENOMEM;
		goto error_field0;
	}
	field->name = "ip";
	field->type = event_type;
	desc->fields[0] = field;

	field = kzalloc(sizeof(struct lttng_kernel_event_field), GFP_KERNEL);
	if (!field) {
		ret = -ENOMEM;
		goto error_field1;
	}
	field->name = "parent_ip";
	field->type = event_type;
	desc->fields[1] = field;

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

	return 0;

error_field1:
	kfree(desc->fields[0]);
error_field0:
	kfree(fieldp_array);
error_fieldp_array:
	kfree(desc->event_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_exit)
{
	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_exit, EVENT_EXIT);
	if (ret)
		goto event_exit_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_exit;
	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_exit->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_EXIT] = event_exit;
	event_entry->u.kretprobe.lttng_krp = lttng_krp;
	event_exit->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_mappings();

	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_exit->desc->fields[0]);
	kfree(event_exit->desc->fields[1]);
	kfree(event_exit->desc->fields);
	kfree(event_exit->desc->event_name);
	kfree(event_exit->desc);
event_exit_error:
	kfree(event_entry->desc->fields[0]);
	kfree(event_entry->desc->fields[1]);
	kfree(event_entry->desc->fields);
	kfree(event_entry->desc->event_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[0]);
	kfree(event->desc->fields[1]);
	kfree(event->desc->fields);
	kfree(event->desc->event_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_exit;
	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_exit = lttng_krp->event[EVENT_EXIT];
	WRITE_ONCE(event->enabled, enable);
	WRITE_ONCE(event_exit->enabled, enable);
	return 0;
}
EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
MODULE_DESCRIPTION("LTTng kretprobes probes");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	LTTNG_MODULES_EXTRAVERSION);
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed MJ	2	*
9f36eaed MJ	3	* probes/lttng-kretprobes.c
7371f44c MD	4	*
	5	* LTTng kretprobes integration module.
	6	*
886d51a3	7	* Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7371f44c MD	8	*/
	9
	10	#include <linux/module.h>
08726907	11	#include <wrapper/kprobes.h>
7371f44c MD	12	#include <linux/slab.h>
7371f44c MD	13	#include <linux/kref.h>
2df37e95	14	#include <lttng/events.h>
24591303	15	#include <ringbuffer/frontend_types.h>
156a3977 MD	16	#include <wrapper/vmalloc.h>
156a3977 MD	17	#include <wrapper/irqflags.h>
2df37e95	18	#include <lttng/tracer.h>
caa068b5	19	#include <blacklist/kprobes.h>
7371f44c MD	20
7371f44c MD	21	enum lttng_kretprobe_type {
1b6cc48a MD	22	EVENT_ENTRY = 0,
1b6cc48a MD	23	EVENT_EXIT = 1,
7371f44c MD	24	};
	25
	26	struct lttng_krp {
	27	struct kretprobe krp;
1b6cc48a	28	struct lttng_event event[2]; / ENTRY and EXIT */
7371f44c MD	29	struct kref kref_register;
	30	struct kref kref_alloc;
	31	};
	32
	33	static
	34	int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
	35	struct pt_regs *regs,
	36	enum lttng_kretprobe_type type)
	37	{
	38	struct lttng_krp *lttng_krp =
08726907	39	container_of(lttng_get_kretprobe(krpi), struct lttng_krp, krp);
a90917c3	40	struct lttng_event *event =
7371f44c	41	lttng_krp->event[type];
79150a49 JD	42	struct lttng_probe_ctx lttng_probe_ctx = {
79150a49 JD	43	.event = event,
ccecf3fb	44	.interruptible = !lttng_regs_irqs_disabled(regs),
79150a49	45	};
a90917c3	46	struct lttng_channel *chan = event->chan;
7371f44c MD	47	struct lib_ring_buffer_ctx ctx;
	48	int ret;
	49	struct {
	50	unsigned long ip;
	51	unsigned long parent_ip;
	52	} payload;
	53
585e5dcc	54	if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
7371f44c	55	return 0;
585e5dcc	56	if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
7371f44c	57	return 0;
585e5dcc	58	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
7371f44c MD	59	return 0;
7371f44c MD	60
08726907	61	payload.ip = (unsigned long) lttng_get_kretprobe(krpi)->kp.addr;
7371f44c MD	62	payload.parent_ip = (unsigned long) krpi->ret_addr;
7371f44c MD	63
79150a49	64	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
a90917c3	65	lttng_alignof(payload), -1);
7371f44c MD	66	ret = chan->ops->event_reserve(&ctx, event->id);
	67	if (ret < 0)
	68	return 0;
a90917c3	69	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
7371f44c MD	70	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	71	chan->ops->event_commit(&ctx);
	72	return 0;
	73	}
	74
	75	static
	76	int lttng_kretprobes_handler_entry(struct kretprobe_instance *krpi,
	77	struct pt_regs *regs)
	78	{
	79	return _lttng_kretprobes_handler(krpi, regs, EVENT_ENTRY);
	80	}
	81
	82	static
1b6cc48a MD	83	int lttng_kretprobes_handler_exit(struct kretprobe_instance *krpi,
1b6cc48a MD	84	struct pt_regs *regs)
7371f44c	85	{
1b6cc48a	86	return _lttng_kretprobes_handler(krpi, regs, EVENT_EXIT);
7371f44c MD	87	}
7371f44c MD	88
437d5aa5 MD	89	static const struct lttng_kernel_type_common *event_type =
	90	lttng_kernel_static_type_integer_from_type(unsigned long, __BYTE_ORDER, 16);
	91
7371f44c MD	92	/*
	93	* Create event description
	94	*/
	95	static
a90917c3	96	int lttng_create_kprobe_event(const char name, struct lttng_event event,
7371f44c MD	97	enum lttng_kretprobe_type type)
7371f44c MD	98	{
437d5aa5 MD	99	const struct lttng_kernel_event_field **fieldp_array;
	100	struct lttng_kernel_event_field *field;
	101	struct lttng_kernel_event_desc *desc;
7371f44c MD	102	char *alloc_name;
	103	size_t name_len;
	104	const char *suffix = NULL;
437d5aa5	105	int ret;
7371f44c	106
437d5aa5	107	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
7371f44c MD	108	if (!desc)
	109	return -ENOMEM;
	110	name_len = strlen(name);
	111	switch (type) {
	112	case EVENT_ENTRY:
	113	suffix = "_entry";
	114	break;
1b6cc48a MD	115	case EVENT_EXIT:
1b6cc48a MD	116	suffix = "_exit";
7371f44c MD	117	break;
	118	}
	119	name_len += strlen(suffix);
	120	alloc_name = kmalloc(name_len + 1, GFP_KERNEL);
	121	if (!alloc_name) {
	122	ret = -ENOMEM;
	123	goto error_str;
	124	}
	125	strcpy(alloc_name, name);
	126	strcat(alloc_name, suffix);
437d5aa5	127	desc->event_name = alloc_name;
7371f44c	128	desc->nr_fields = 2;
437d5aa5 MD	129	fieldp_array = kzalloc(desc->nr_fields * sizeof(struct lttng_kernel_event_field *), GFP_KERNEL);
	130	if (!fieldp_array) {
	131	ret = -ENOMEM;
	132	goto error_fieldp_array;
	133	}
	134	desc->fields = fieldp_array;
	135
	136	field = kzalloc(sizeof(struct lttng_kernel_event_field), GFP_KERNEL);
	137	if (!field) {
7371f44c	138	ret = -ENOMEM;
437d5aa5	139	goto error_field0;
7371f44c	140	}
437d5aa5 MD	141	field->name = "ip";
	142	field->type = event_type;
	143	desc->fields[0] = field;
7371f44c	144
437d5aa5 MD	145	field = kzalloc(sizeof(struct lttng_kernel_event_field), GFP_KERNEL);
	146	if (!field) {
	147	ret = -ENOMEM;
	148	goto error_field1;
	149	}
	150	field->name = "parent_ip";
	151	field->type = event_type;
	152	desc->fields[1] = field;
7371f44c MD	153
	154	desc->owner = THIS_MODULE;
	155	event->desc = desc;
	156
	157	return 0;
	158
437d5aa5 MD	159	error_field1:
	160	kfree(desc->fields[0]);
	161	error_field0:
	162	kfree(fieldp_array);
	163	error_fieldp_array:
	164	kfree(desc->event_name);
7371f44c MD	165	error_str:
	166	kfree(desc);
	167	return ret;
	168	}
	169
	170	int lttng_kretprobes_register(const char *name,
	171	const char *symbol_name,
	172	uint64_t offset,
	173	uint64_t addr,
a90917c3	174	struct lttng_event *event_entry,
1b6cc48a	175	struct lttng_event *event_exit)
7371f44c MD	176	{
	177	int ret;
	178	struct lttng_krp *lttng_krp;
	179
	180	/* Kprobes expects a NULL symbol name if unused */
	181	if (symbol_name[0] == '\0')
	182	symbol_name = NULL;
	183
	184	ret = lttng_create_kprobe_event(name, event_entry, EVENT_ENTRY);
	185	if (ret)
	186	goto error;
1b6cc48a	187	ret = lttng_create_kprobe_event(name, event_exit, EVENT_EXIT);
7371f44c	188	if (ret)
1b6cc48a	189	goto event_exit_error;
7371f44c MD	190	lttng_krp = kzalloc(sizeof(*lttng_krp), GFP_KERNEL);
	191	if (!lttng_krp)
	192	goto krp_error;
	193	lttng_krp->krp.entry_handler = lttng_kretprobes_handler_entry;
1b6cc48a	194	lttng_krp->krp.handler = lttng_kretprobes_handler_exit;
7371f44c MD	195	if (symbol_name) {
	196	char *alloc_symbol;
	197
	198	alloc_symbol = kstrdup(symbol_name, GFP_KERNEL);
	199	if (!alloc_symbol) {
	200	ret = -ENOMEM;
	201	goto name_error;
	202	}
	203	lttng_krp->krp.kp.symbol_name =
	204	alloc_symbol;
	205	event_entry->u.kretprobe.symbol_name =
	206	alloc_symbol;
1b6cc48a	207	event_exit->u.kretprobe.symbol_name =
7371f44c MD	208	alloc_symbol;
	209	}
	210	lttng_krp->krp.kp.offset = offset;
b2c4e8fb	211	lttng_krp->krp.kp.addr = (void *) (unsigned long) addr;
7371f44c MD	212
	213	/* Allow probe handler to find event structures */
	214	lttng_krp->event[EVENT_ENTRY] = event_entry;
1b6cc48a	215	lttng_krp->event[EVENT_EXIT] = event_exit;
7371f44c	216	event_entry->u.kretprobe.lttng_krp = lttng_krp;
1b6cc48a	217	event_exit->u.kretprobe.lttng_krp = lttng_krp;
7371f44c MD	218
	219	/*
	220	* Both events must be unregistered before the kretprobe is
	221	* unregistered. Same for memory allocation.
	222	*/
	223	kref_init(&lttng_krp->kref_alloc);
9c1f4643	224	kref_get(&lttng_krp->kref_alloc); /* inc refcount to 2, no overflow. */
7371f44c	225	kref_init(&lttng_krp->kref_register);
9c1f4643	226	kref_get(&lttng_krp->kref_register); /* inc refcount to 2, no overflow. */
7371f44c MD	227
	228	/*
	229	* Ensure the memory we just allocated don't trigger page faults.
	230	* Well.. kprobes itself puts the page fault handler on the blacklist,
	231	* but we can never be too careful.
	232	*/
263b6c88	233	wrapper_vmalloc_sync_mappings();
7371f44c MD	234
	235	ret = register_kretprobe(&lttng_krp->krp);
	236	if (ret)
	237	goto register_error;
	238	return 0;
	239
	240	register_error:
	241	kfree(lttng_krp->krp.kp.symbol_name);
	242	name_error:
	243	kfree(lttng_krp);
	244	krp_error:
437d5aa5 MD	245	kfree(event_exit->desc->fields[0]);
437d5aa5 MD	246	kfree(event_exit->desc->fields[1]);
1b6cc48a	247	kfree(event_exit->desc->fields);
437d5aa5	248	kfree(event_exit->desc->event_name);
1b6cc48a MD	249	kfree(event_exit->desc);
1b6cc48a MD	250	event_exit_error:
437d5aa5 MD	251	kfree(event_entry->desc->fields[0]);
437d5aa5 MD	252	kfree(event_entry->desc->fields[1]);
7371f44c	253	kfree(event_entry->desc->fields);
437d5aa5	254	kfree(event_entry->desc->event_name);
7371f44c MD	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	285	{
437d5aa5 MD	286	kfree(event->desc->fields[0]);
437d5aa5 MD	287	kfree(event->desc->fields[1]);
7371f44c	288	kfree(event->desc->fields);
437d5aa5	289	kfree(event->desc->event_name);
7371f44c MD	290	kfree(event->desc);
	291	kref_put(&event->u.kretprobe.lttng_krp->kref_alloc,
	292	_lttng_kretprobes_release);
	293	}
	294	EXPORT_SYMBOL_GPL(lttng_kretprobes_destroy_private);
	295
a0493bef MD	296	int lttng_kretprobes_event_enable_state(struct lttng_event *event,
	297	int enable)
	298	{
1b6cc48a	299	struct lttng_event *event_exit;
a0493bef MD	300	struct lttng_krp *lttng_krp;
	301
	302	if (event->instrumentation != LTTNG_KERNEL_KRETPROBE) {
	303	return -EINVAL;
	304	}
	305	if (event->enabled == enable) {
	306	return -EBUSY;
	307	}
	308	lttng_krp = event->u.kretprobe.lttng_krp;
1b6cc48a	309	event_exit = lttng_krp->event[EVENT_EXIT];
a8f2d0c7	310	WRITE_ONCE(event->enabled, enable);
1b6cc48a	311	WRITE_ONCE(event_exit->enabled, enable);
a0493bef MD	312	return 0;
	313	}
	314	EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);
	315
7371f44c	316	MODULE_LICENSE("GPL and additional rights");
1c124020 MJ	317	MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
1c124020 MJ	318	MODULE_DESCRIPTION("LTTng kretprobes probes");
13ab8b0a MD	319	MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	320	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	321	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	322	LTTNG_MODULES_EXTRAVERSION);