[deliverable/linux.git] / include / linux / kprobes.h

#ifndef _LINUX_KPROBES_H
#define _LINUX_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *  include/linux/kprobes.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2002, 2004
 *
 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *		Probes initial implementation ( includes suggestions from
 *		Rusty Russell).
 * 2004-July	Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
 *		interface to access function arguments.
 * 2005-May	Hien Nguyen <hien@us.ibm.com> and Jim Keniston
 *		<jkenisto@us.ibm.com>  and Prasanna S Panchamukhi
 *		<prasanna@in.ibm.com> added function-return probes.
 */
#include <linux/linkage.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>

#ifdef CONFIG_KPROBES
#include <asm/kprobes.h>

/* kprobe_status settings */
#define KPROBE_HIT_ACTIVE	0x00000001
#define KPROBE_HIT_SS		0x00000002
#define KPROBE_REENTER		0x00000004
#define KPROBE_HIT_SSDONE	0x00000008

/* Attach to insert probes on any functions which should be ignored*/
#define __kprobes	__attribute__((__section__(".kprobes.text"))) notrace

struct kprobe;
struct pt_regs;
struct kretprobe;
struct kretprobe_instance;
typedef int (*kprobe_pre_handler_t) (struct kprobe *, struct pt_regs *);
typedef int (*kprobe_break_handler_t) (struct kprobe *, struct pt_regs *);
typedef void (*kprobe_post_handler_t) (struct kprobe *, struct pt_regs *,
				       unsigned long flags);
typedef int (*kprobe_fault_handler_t) (struct kprobe *, struct pt_regs *,
				       int trapnr);
typedef int (*kretprobe_handler_t) (struct kretprobe_instance *,
				    struct pt_regs *);

struct kprobe {
	struct hlist_node hlist;

	/* list of kprobes for multi-handler support */
	struct list_head list;

	/* Indicates that the corresponding module has been ref counted */
	unsigned int mod_refcounted;

	/*count the number of times this probe was temporarily disarmed */
	unsigned long nmissed;

	/* location of the probe point */
	kprobe_opcode_t *addr;

	/* Allow user to indicate symbol name of the probe point */
	const char *symbol_name;

	/* Offset into the symbol */
	unsigned int offset;

	/* Called before addr is executed. */
	kprobe_pre_handler_t pre_handler;

	/* Called after addr is executed, unless... */
	kprobe_post_handler_t post_handler;

	/* ... called if executing addr causes a fault (eg. page fault).
	 * Return 1 if it handled fault, otherwise kernel will see it. */
	kprobe_fault_handler_t fault_handler;

	/* ... called if breakpoint trap occurs in probe handler.
	 * Return 1 if it handled break, otherwise kernel will see it. */
	kprobe_break_handler_t break_handler;

	/* Saved opcode (which has been replaced with breakpoint) */
	kprobe_opcode_t opcode;

	/* copy of the original instruction */
	struct arch_specific_insn ainsn;
};

/*
 * Special probe type that uses setjmp-longjmp type tricks to resume
 * execution at a specified entry with a matching prototype corresponding
 * to the probed function - a trick to enable arguments to become
 * accessible seamlessly by probe handling logic.
 * Note:
 * Because of the way compilers allocate stack space for local variables
 * etc upfront, regardless of sub-scopes within a function, this mirroring
 * principle currently works only for probes placed on function entry points.
 */
struct jprobe {
	struct kprobe kp;
	void *entry;	/* probe handling code to jump to */
};

/* For backward compatibility with old code using JPROBE_ENTRY() */
#define JPROBE_ENTRY(handler)	(handler)

DECLARE_PER_CPU(struct kprobe *, current_kprobe);
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);

#ifdef CONFIG_KRETPROBES
extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
				   struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
#else /* CONFIG_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
					struct pt_regs *regs)
{
}
static inline int arch_trampoline_kprobe(struct kprobe *p)
{
	return 0;
}
#endif /* CONFIG_KRETPROBES */
/*
 * Function-return probe -
 * Note:
 * User needs to provide a handler function, and initialize maxactive.
 * maxactive - The maximum number of instances of the probed function that
 * can be active concurrently.
 * nmissed - tracks the number of times the probed function's return was
 * ignored, due to maxactive being too low.
 *
 */
struct kretprobe {
	struct kprobe kp;
	kretprobe_handler_t handler;
	kretprobe_handler_t entry_handler;
	int maxactive;
	int nmissed;
	size_t data_size;
	struct hlist_head free_instances;
	spinlock_t lock;
};

struct kretprobe_instance {
	struct hlist_node hlist;
	struct kretprobe *rp;
	kprobe_opcode_t *ret_addr;
	struct task_struct *task;
	char data[0];
};

struct kretprobe_blackpoint {
	const char *name;
	void *addr;
};

struct kprobe_blackpoint {
	const char *name;
	unsigned long start_addr;
	unsigned long range;
};

extern struct kretprobe_blackpoint kretprobe_blacklist[];

static inline void kretprobe_assert(struct kretprobe_instance *ri,
	unsigned long orig_ret_address, unsigned long trampoline_address)
{
	if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
		printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
				ri->rp, ri->rp->kp.addr);
		BUG();
	}
}

#ifdef CONFIG_KPROBES_SANITY_TEST
extern int init_test_probes(void);
#else
static inline int init_test_probes(void)
{
	return 0;
}
#endif /* CONFIG_KPROBES_SANITY_TEST */

extern struct mutex kprobe_mutex;
extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
extern int arch_init_kprobes(void);
extern void show_registers(struct pt_regs *regs);
extern kprobe_opcode_t *get_insn_slot(void);
extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
extern void kprobes_inc_nmissed_count(struct kprobe *p);

/* Get the kprobe at this addr (if any) - called with preemption disabled */
struct kprobe *get_kprobe(void *addr);
void kretprobe_hash_lock(struct task_struct *tsk,
			 struct hlist_head **head, unsigned long *flags);
void kretprobe_hash_unlock(struct task_struct *tsk, unsigned long *flags);
struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);

/* kprobe_running() will just return the current_kprobe on this CPU */
static inline struct kprobe *kprobe_running(void)
{
	return (__get_cpu_var(current_kprobe));
}

static inline void reset_current_kprobe(void)
{
	__get_cpu_var(current_kprobe) = NULL;
}

static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
{
	return (&__get_cpu_var(kprobe_ctlblk));
}

int register_kprobe(struct kprobe *p);
void unregister_kprobe(struct kprobe *p);
int register_kprobes(struct kprobe **kps, int num);
void unregister_kprobes(struct kprobe **kps, int num);
int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
int longjmp_break_handler(struct kprobe *, struct pt_regs *);
int register_jprobe(struct jprobe *p);
void unregister_jprobe(struct jprobe *p);
int register_jprobes(struct jprobe **jps, int num);
void unregister_jprobes(struct jprobe **jps, int num);
void jprobe_return(void);
unsigned long arch_deref_entry_point(void *);

int register_kretprobe(struct kretprobe *rp);
void unregister_kretprobe(struct kretprobe *rp);
int register_kretprobes(struct kretprobe **rps, int num);
void unregister_kretprobes(struct kretprobe **rps, int num);

void kprobe_flush_task(struct task_struct *tk);
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);

#else /* CONFIG_KPROBES */

#define __kprobes	notrace
struct jprobe;
struct kretprobe;

static inline struct kprobe *get_kprobe(void *addr)
{
	return NULL;
}
static inline struct kprobe *kprobe_running(void)
{
	return NULL;
}
static inline int register_kprobe(struct kprobe *p)
{
	return -ENOSYS;
}
static inline int register_kprobes(struct kprobe **kps, int num)
{
	return -ENOSYS;
}
static inline void unregister_kprobe(struct kprobe *p)
{
}
static inline void unregister_kprobes(struct kprobe **kps, int num)
{
}
static inline int register_jprobe(struct jprobe *p)
{
	return -ENOSYS;
}
static inline int register_jprobes(struct jprobe **jps, int num)
{
	return -ENOSYS;
}
static inline void unregister_jprobe(struct jprobe *p)
{
}
static inline void unregister_jprobes(struct jprobe **jps, int num)
{
}
static inline void jprobe_return(void)
{
}
static inline int register_kretprobe(struct kretprobe *rp)
{
	return -ENOSYS;
}
static inline int register_kretprobes(struct kretprobe **rps, int num)
{
	return -ENOSYS;
}
static inline void unregister_kretprobe(struct kretprobe *rp)
{
}
static inline void unregister_kretprobes(struct kretprobe **rps, int num)
{
}
static inline void kprobe_flush_task(struct task_struct *tk)
{
}
#endif				/* CONFIG_KPROBES */
#endif				/* _LINUX_KPROBES_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_KPROBES_H
	2	#define _LINUX_KPROBES_H
	3	/*
	4	* Kernel Probes (KProbes)
	5	* include/linux/kprobes.h
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	20	*
	21	* Copyright (C) IBM Corporation, 2002, 2004
	22	*
	23	* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
	24	* Probes initial implementation ( includes suggestions from
	25	* Rusty Russell).
	26	* 2004-July Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
	27	* interface to access function arguments.
b94cce92 HN	28	* 2005-May Hien Nguyen <hien@us.ibm.com> and Jim Keniston
	29	* <jkenisto@us.ibm.com> and Prasanna S Panchamukhi
	30	* <prasanna@in.ibm.com> added function-return probes.
1da177e4	31	*/
36dcd67a	32	#include <linux/linkage.h>
1da177e4 LT	33	#include <linux/list.h>
	34	#include <linux/notifier.h>
	35	#include <linux/smp.h>
e6584523	36	#include <linux/percpu.h>
3516a460 AM	37	#include <linux/spinlock.h>
3516a460 AM	38	#include <linux/rcupdate.h>
7a7d1cf9	39	#include <linux/mutex.h>
b94cce92	40
00d7c05a	41	#ifdef CONFIG_KPROBES
1da177e4 LT	42	#include <asm/kprobes.h>
1da177e4 LT	43
ea32c65c PP	44	/* kprobe_status settings */
	45	#define KPROBE_HIT_ACTIVE 0x00000001
	46	#define KPROBE_HIT_SS 0x00000002
	47	#define KPROBE_REENTER 0x00000004
	48	#define KPROBE_HIT_SSDONE 0x00000008
	49
d0aaff97	50	/* Attach to insert probes on any functions which should be ignored*/
36dcd67a	51	#define __kprobes __attribute__((__section__(".kprobes.text"))) notrace
d0aaff97	52
1da177e4 LT	53	struct kprobe;
1da177e4 LT	54	struct pt_regs;
b94cce92 HN	55	struct kretprobe;
b94cce92 HN	56	struct kretprobe_instance;
1da177e4 LT	57	typedef int (kprobe_pre_handler_t) (struct kprobe , struct pt_regs *);
	58	typedef int (kprobe_break_handler_t) (struct kprobe , struct pt_regs *);
	59	typedef void (kprobe_post_handler_t) (struct kprobe , struct pt_regs *,
	60	unsigned long flags);
	61	typedef int (kprobe_fault_handler_t) (struct kprobe , struct pt_regs *,
	62	int trapnr);
b94cce92 HN	63	typedef int (kretprobe_handler_t) (struct kretprobe_instance ,
	64	struct pt_regs *);
	65
1da177e4 LT	66	struct kprobe {
	67	struct hlist_node hlist;
	68
64f562c6 AM	69	/* list of kprobes for multi-handler support */
	70	struct list_head list;
	71
df019b1d KA	72	/* Indicates that the corresponding module has been ref counted */
	73	unsigned int mod_refcounted;
	74
ea32c65c PP	75	/count the number of times this probe was temporarily disarmed /
	76	unsigned long nmissed;
	77
1da177e4 LT	78	/* location of the probe point */
	79	kprobe_opcode_t *addr;
	80
3a872d89	81	/* Allow user to indicate symbol name of the probe point */
9b3af29b	82	const char *symbol_name;
3a872d89 AM	83
	84	/* Offset into the symbol */
	85	unsigned int offset;
	86
1da177e4 LT	87	/* Called before addr is executed. */
	88	kprobe_pre_handler_t pre_handler;
	89
	90	/* Called after addr is executed, unless... */
	91	kprobe_post_handler_t post_handler;
	92
	93	/* ... called if executing addr causes a fault (eg. page fault).
	94	* Return 1 if it handled fault, otherwise kernel will see it. */
	95	kprobe_fault_handler_t fault_handler;
	96
	97	/* ... called if breakpoint trap occurs in probe handler.
	98	* Return 1 if it handled break, otherwise kernel will see it. */
	99	kprobe_break_handler_t break_handler;
	100
	101	/* Saved opcode (which has been replaced with breakpoint) */
	102	kprobe_opcode_t opcode;
	103
	104	/* copy of the original instruction */
	105	struct arch_specific_insn ainsn;
	106	};
	107
	108	/*
	109	* Special probe type that uses setjmp-longjmp type tricks to resume
	110	* execution at a specified entry with a matching prototype corresponding
	111	* to the probed function - a trick to enable arguments to become
	112	* accessible seamlessly by probe handling logic.
	113	* Note:
	114	* Because of the way compilers allocate stack space for local variables
	115	* etc upfront, regardless of sub-scopes within a function, this mirroring
	116	* principle currently works only for probes placed on function entry points.
	117	*/
	118	struct jprobe {
	119	struct kprobe kp;
81eae375	120	void entry; / probe handling code to jump to */
1da177e4 LT	121	};
1da177e4 LT	122
9e367d85 ME	123	/* For backward compatibility with old code using JPROBE_ENTRY() */
	124	#define JPROBE_ENTRY(handler) (handler)
	125
e6584523 AM	126	DECLARE_PER_CPU(struct kprobe *, current_kprobe);
	127	DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
	128
9edddaa2	129	#ifdef CONFIG_KRETPROBES
4c4308cb CH	130	extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
4c4308cb CH	131	struct pt_regs *regs);
bf8f6e5b	132	extern int arch_trampoline_kprobe(struct kprobe *p);
9edddaa2	133	#else /* CONFIG_KRETPROBES */
b94cce92 HN	134	static inline void arch_prepare_kretprobe(struct kretprobe *rp,
	135	struct pt_regs *regs)
	136	{
	137	}
bf8f6e5b AM	138	static inline int arch_trampoline_kprobe(struct kprobe *p)
	139	{
	140	return 0;
	141	}
9edddaa2	142	#endif /* CONFIG_KRETPROBES */
b94cce92 HN	143	/*
	144	* Function-return probe -
	145	* Note:
	146	* User needs to provide a handler function, and initialize maxactive.
	147	* maxactive - The maximum number of instances of the probed function that
	148	* can be active concurrently.
	149	* nmissed - tracks the number of times the probed function's return was
	150	* ignored, due to maxactive being too low.
	151	*
	152	*/
	153	struct kretprobe {
	154	struct kprobe kp;
	155	kretprobe_handler_t handler;
f47cd9b5	156	kretprobe_handler_t entry_handler;
b94cce92 HN	157	int maxactive;
b94cce92 HN	158	int nmissed;
f47cd9b5	159	size_t data_size;
b94cce92	160	struct hlist_head free_instances;
ef53d9c5	161	spinlock_t lock;
b94cce92 HN	162	};
	163
	164	struct kretprobe_instance {
b94cce92 HN	165	struct hlist_node hlist;
b94cce92 HN	166	struct kretprobe *rp;
802eae7c RL	167	kprobe_opcode_t *ret_addr;
802eae7c RL	168	struct task_struct *task;
f47cd9b5	169	char data[0];
b94cce92 HN	170	};
b94cce92 HN	171
f438d914 MH	172	struct kretprobe_blackpoint {
	173	const char *name;
	174	void *addr;
	175	};
3d8d996e SD	176
	177	struct kprobe_blackpoint {
	178	const char *name;
	179	unsigned long start_addr;
	180	unsigned long range;
	181	};
	182
f438d914 MH	183	extern struct kretprobe_blackpoint kretprobe_blacklist[];
f438d914 MH	184
0f95b7fc AM	185	static inline void kretprobe_assert(struct kretprobe_instance *ri,
	186	unsigned long orig_ret_address, unsigned long trampoline_address)
	187	{
	188	if (!orig_ret_address \|\| (orig_ret_address == trampoline_address)) {
	189	printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
	190	ri->rp, ri->rp->kp.addr);
	191	BUG();
	192	}
	193	}
	194
8c1c9356 AM	195	#ifdef CONFIG_KPROBES_SANITY_TEST
	196	extern int init_test_probes(void);
	197	#else
	198	static inline int init_test_probes(void)
	199	{
	200	return 0;
	201	}
	202	#endif /* CONFIG_KPROBES_SANITY_TEST */
	203
7a7d1cf9	204	extern struct mutex kprobe_mutex;
1da177e4	205	extern int arch_prepare_kprobe(struct kprobe *p);
7e1048b1 RL	206	extern void arch_arm_kprobe(struct kprobe *p);
7e1048b1 RL	207	extern void arch_disarm_kprobe(struct kprobe *p);
6772926b	208	extern int arch_init_kprobes(void);
1da177e4	209	extern void show_registers(struct pt_regs *regs);
9ec4b1f3	210	extern kprobe_opcode_t *get_insn_slot(void);
b4c6c34a	211	extern void free_insn_slot(kprobe_opcode_t *slot, int dirty);
bf8d5c52	212	extern void kprobes_inc_nmissed_count(struct kprobe *p);
1da177e4	213
d217d545	214	/* Get the kprobe at this addr (if any) - called with preemption disabled */
1da177e4	215	struct kprobe get_kprobe(void addr);
ef53d9c5 S	216	void kretprobe_hash_lock(struct task_struct *tsk,
	217	struct hlist_head *head, unsigned long flags);
	218	void kretprobe_hash_unlock(struct task_struct tsk, unsigned long flags);
b94cce92	219	struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
1da177e4	220
e6584523 AM	221	/* kprobe_running() will just return the current_kprobe on this CPU */
	222	static inline struct kprobe *kprobe_running(void)
	223	{
	224	return (__get_cpu_var(current_kprobe));
	225	}
	226
	227	static inline void reset_current_kprobe(void)
	228	{
	229	__get_cpu_var(current_kprobe) = NULL;
	230	}
	231
	232	static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
	233	{
	234	return (&__get_cpu_var(kprobe_ctlblk));
	235	}
	236
1da177e4 LT	237	int register_kprobe(struct kprobe *p);
1da177e4 LT	238	void unregister_kprobe(struct kprobe *p);
9861668f MH	239	int register_kprobes(struct kprobe **kps, int num);
9861668f MH	240	void unregister_kprobes(struct kprobe **kps, int num);
1da177e4 LT	241	int setjmp_pre_handler(struct kprobe , struct pt_regs );
	242	int longjmp_break_handler(struct kprobe , struct pt_regs );
	243	int register_jprobe(struct jprobe *p);
	244	void unregister_jprobe(struct jprobe *p);
26b31c19 MH	245	int register_jprobes(struct jprobe **jps, int num);
26b31c19 MH	246	void unregister_jprobes(struct jprobe **jps, int num);
1da177e4	247	void jprobe_return(void);
3d7e3382	248	unsigned long arch_deref_entry_point(void *);
1da177e4	249
b94cce92 HN	250	int register_kretprobe(struct kretprobe *rp);
b94cce92 HN	251	void unregister_kretprobe(struct kretprobe *rp);
4a296e07 MH	252	int register_kretprobes(struct kretprobe **rps, int num);
4a296e07 MH	253	void unregister_kretprobes(struct kretprobe **rps, int num);
b94cce92	254
b94cce92	255	void kprobe_flush_task(struct task_struct *tk);
99219a3f	256	void recycle_rp_inst(struct kretprobe_instance ri, struct hlist_head head);
8c1c9356	257
b94cce92	258	#else /* CONFIG_KPROBES */
00d7c05a	259
36dcd67a	260	#define __kprobes notrace
00d7c05a KA	261	struct jprobe;
	262	struct kretprobe;
	263
785656a4 AS	264	static inline struct kprobe get_kprobe(void addr)
	265	{
	266	return NULL;
	267	}
e6584523	268	static inline struct kprobe *kprobe_running(void)
1da177e4	269	{
e6584523	270	return NULL;
1da177e4 LT	271	}
	272	static inline int register_kprobe(struct kprobe *p)
	273	{
	274	return -ENOSYS;
	275	}
9861668f MH	276	static inline int register_kprobes(struct kprobe **kps, int num)
	277	{
	278	return -ENOSYS;
	279	}
1da177e4 LT	280	static inline void unregister_kprobe(struct kprobe *p)
	281	{
	282	}
9861668f MH	283	static inline void unregister_kprobes(struct kprobe **kps, int num)
	284	{
	285	}
1da177e4 LT	286	static inline int register_jprobe(struct jprobe *p)
	287	{
	288	return -ENOSYS;
	289	}
26b31c19 MH	290	static inline int register_jprobes(struct jprobe **jps, int num)
	291	{
	292	return -ENOSYS;
	293	}
1da177e4 LT	294	static inline void unregister_jprobe(struct jprobe *p)
	295	{
	296	}
26b31c19 MH	297	static inline void unregister_jprobes(struct jprobe **jps, int num)
	298	{
	299	}
1da177e4 LT	300	static inline void jprobe_return(void)
	301	{
	302	}
b94cce92 HN	303	static inline int register_kretprobe(struct kretprobe *rp)
	304	{
	305	return -ENOSYS;
	306	}
4a296e07 MH	307	static inline int register_kretprobes(struct kretprobe **rps, int num)
	308	{
	309	return -ENOSYS;
	310	}
b94cce92 HN	311	static inline void unregister_kretprobe(struct kretprobe *rp)
	312	{
	313	}
4a296e07 MH	314	static inline void unregister_kretprobes(struct kretprobe **rps, int num)
	315	{
	316	}
b94cce92 HN	317	static inline void kprobe_flush_task(struct task_struct *tk)
	318	{
	319	}
	320	#endif /* CONFIG_KPROBES */
1da177e4	321	#endif /* _LINUX_KPROBES_H */