1 files changed, 582 insertions, 1207 deletions

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 00d527c945a..282f6e4e553 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -19,185 +19,134 @@
 
 #include <linux/module.h>
 #include <linux/uaccess.h>
-#include <linux/kprobes.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/smp.h>
-#include <linux/debugfs.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-#include <linux/ptrace.h>
-#include <linux/perf_event.h>
-#include <linux/stringify.h>
-#include <linux/limits.h>
-#include <asm/bitsperlong.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-#define MAX_TRACE_ARGS 128
-#define MAX_ARGSTR_LEN 63
-#define MAX_EVENT_NAME_LEN 64
-#define MAX_STRING_SIZE PATH_MAX
+
+#include "trace_probe.h"
+
 #define KPROBE_EVENT_SYSTEM "kprobes"
 
-/* Reserved field names */
-#define FIELD_STRING_IP "__probe_ip"
-#define FIELD_STRING_RETIP "__probe_ret_ip"
-#define FIELD_STRING_FUNC "__probe_func"
-
-const char *reserved_field_names[] = {
-	"common_type",
-	"common_flags",
-	"common_preempt_count",
-	"common_pid",
-	"common_tgid",
-	FIELD_STRING_IP,
-	FIELD_STRING_RETIP,
-	FIELD_STRING_FUNC,
+/**
+ * Kprobe event core functions
+ */
+struct trace_kprobe {
+	struct list_head	list;
+	struct kretprobe	rp;	/* Use rp.kp for kprobe use */
+	unsigned long 		nhit;
+	const char		*symbol;	/* symbol name */
+	struct trace_probe	tp;
 };
 
-/* Printing function type */
-typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
-				 void *);
-#define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
-#define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
-
-/* Printing  in basic type function template */
-#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast)			\
-static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,	\
-						const char *name,	\
-						void *data, void *ent)\
-{									\
-	return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
-}									\
-static const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
-
-DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
-DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
-
-/* data_rloc: data relative location, compatible with u32 */
-#define make_data_rloc(len, roffs)	\
-	(((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
-#define get_rloc_len(dl)	((u32)(dl) >> 16)
-#define get_rloc_offs(dl)	((u32)(dl) & 0xffff)
-
-static inline void *get_rloc_data(u32 *dl)
+#define SIZEOF_TRACE_KPROBE(n)				\
+	(offsetof(struct trace_kprobe, tp.args) +	\
+	(sizeof(struct probe_arg) * (n)))
+
+
+static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk)
 {
-	return (u8 *)dl + get_rloc_offs(*dl);
+	return tk->rp.handler != NULL;
 }
 
-/* For data_loc conversion */
-static inline void *get_loc_data(u32 *dl, void *ent)
+static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk)
 {
-	return (u8 *)ent + get_rloc_offs(*dl);
+	return tk->symbol ? tk->symbol : "unknown";
 }
 
-/*
- * Convert data_rloc to data_loc:
- *  data_rloc stores the offset from data_rloc itself, but data_loc
- *  stores the offset from event entry.
- */
-#define convert_rloc_to_loc(dl, offs)	((u32)(dl) + (offs))
+static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk)
+{
+	return tk->rp.kp.offset;
+}
 
-/* For defining macros, define string/string_size types */
-typedef u32 string;
-typedef u32 string_size;
+static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
+{
+	return !!(kprobe_gone(&tk->rp.kp));
+}
 
-/* Print type function for string type */
-static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
-						  const char *name,
-						  void *data, void *ent)
+static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
+						 struct module *mod)
 {
-	int len = *(u32 *)data >> 16;
+	int len = strlen(mod->name);
+	const char *name = trace_kprobe_symbol(tk);
+	return strncmp(mod->name, name, len) == 0 && name[len] == ':';
+}
 
-	if (!len)
-		return trace_seq_printf(s, " %s=(fault)", name);
-	else
-		return trace_seq_printf(s, " %s=\"%s\"", name,
-					(const char *)get_loc_data(data, ent));
+static nokprobe_inline bool trace_kprobe_is_on_module(struct trace_kprobe *tk)
+{
+	return !!strchr(trace_kprobe_symbol(tk), ':');
 }
-static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-/* Data fetch function type */
-typedef	void (*fetch_func_t)(struct pt_regs *, void *, void *);
+static int register_kprobe_event(struct trace_kprobe *tk);
+static int unregister_kprobe_event(struct trace_kprobe *tk);
+
+static DEFINE_MUTEX(probe_lock);
+static LIST_HEAD(probe_list);
+
+static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
+static int kretprobe_dispatcher(struct kretprobe_instance *ri,
+				struct pt_regs *regs);
 
-struct fetch_param {
-	fetch_func_t	fn;
-	void *data;
+/* Memory fetching by symbol */
+struct symbol_cache {
+	char		*symbol;
+	long		offset;
+	unsigned long	addr;
 };
 
-static __kprobes void call_fetch(struct fetch_param *fprm,
-				 struct pt_regs *regs, void *dest)
+unsigned long update_symbol_cache(struct symbol_cache *sc)
 {
-	return fprm->fn(regs, fprm->data, dest);
+	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
+
+	if (sc->addr)
+		sc->addr += sc->offset;
+
+	return sc->addr;
 }
 
-#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
-/*
- * Define macro for basic types - we don't need to define s* types, because
- * we have to care only about bitwidth at recording time.
- */
-#define DEFINE_BASIC_FETCH_FUNCS(method) \
-DEFINE_FETCH_##method(u8)		\
-DEFINE_FETCH_##method(u16)		\
-DEFINE_FETCH_##method(u32)		\
-DEFINE_FETCH_##method(u64)
-
-#define CHECK_FETCH_FUNCS(method, fn)			\
-	(((FETCH_FUNC_NAME(method, u8) == fn) ||	\
-	  (FETCH_FUNC_NAME(method, u16) == fn) ||	\
-	  (FETCH_FUNC_NAME(method, u32) == fn) ||	\
-	  (FETCH_FUNC_NAME(method, u64) == fn) ||	\
-	  (FETCH_FUNC_NAME(method, string) == fn) ||	\
-	  (FETCH_FUNC_NAME(method, string_size) == fn)) \
-	 && (fn != NULL))
-
-/* Data fetch function templates */
-#define DEFINE_FETCH_reg(type)						\
-static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs,	\
-					void *offset, void *dest)	\
-{									\
-	*(type *)dest = (type)regs_get_register(regs,			\
-				(unsigned int)((unsigned long)offset));	\
+void free_symbol_cache(struct symbol_cache *sc)
+{
+	kfree(sc->symbol);
+	kfree(sc);
+}
+
+struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
+{
+	struct symbol_cache *sc;
+
+	if (!sym || strlen(sym) == 0)
+		return NULL;
+
+	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
+	if (!sc)
+		return NULL;
+
+	sc->symbol = kstrdup(sym, GFP_KERNEL);
+	if (!sc->symbol) {
+		kfree(sc);
+		return NULL;
+	}
+	sc->offset = offset;
+	update_symbol_cache(sc);
+
+	return sc;
 }
-DEFINE_BASIC_FETCH_FUNCS(reg)
-/* No string on the register */
-#define fetch_reg_string NULL
-#define fetch_reg_string_size NULL
 
+/*
+ * Kprobes-specific fetch functions
+ */
 #define DEFINE_FETCH_stack(type)					\
-static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,		\
 					  void *offset, void *dest)	\
 {									\
 	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
 				(unsigned int)((unsigned long)offset));	\
-}
+}									\
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(stack, type));
+
 DEFINE_BASIC_FETCH_FUNCS(stack)
 /* No string on the stack entry */
-#define fetch_stack_string NULL
-#define fetch_stack_string_size NULL
-
-#define DEFINE_FETCH_retval(type)					\
-static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
-					  void *dummy, void *dest)	\
-{									\
-	*(type *)dest = (type)regs_return_value(regs);			\
-}
-DEFINE_BASIC_FETCH_FUNCS(retval)
-/* No string on the retval */
-#define fetch_retval_string NULL
-#define fetch_retval_string_size NULL
+#define fetch_stack_string	NULL
+#define fetch_stack_string_size	NULL
 
 #define DEFINE_FETCH_memory(type)					\
-static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,		\
 					  void *addr, void *dest)	\
 {									\
 	type retval;							\
@@ -205,31 +154,37 @@ static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
 		*(type *)dest = 0;					\
 	else								\
 		*(type *)dest = retval;					\
-}
+}									\
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, type));
+
 DEFINE_BASIC_FETCH_FUNCS(memory)
 /*
  * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
  * length and relative data location.
  */
-static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
-						      void *addr, void *dest)
+static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+					    void *addr, void *dest)
 {
 	long ret;
 	int maxlen = get_rloc_len(*(u32 *)dest);
 	u8 *dst = get_rloc_data(dest);
 	u8 *src = addr;
 	mm_segment_t old_fs = get_fs();
+
 	if (!maxlen)
 		return;
+
 	/*
 	 * Try to get string again, since the string can be changed while
 	 * probing.
 	 */
 	set_fs(KERNEL_DS);
 	pagefault_disable();
+
 	do
 		ret = __copy_from_user_inatomic(dst++, src++, 1);
 	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+
 	dst[-1] = '\0';
 	pagefault_enable();
 	set_fs(old_fs);
@@ -237,24 +192,30 @@ static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
 	if (ret < 0) {	/* Failed to fetch string */
 		((u8 *)get_rloc_data(dest))[0] = '\0';
 		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
-	} else
+	} else {
 		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
 					      get_rloc_offs(*(u32 *)dest));
+	}
 }
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string));
+
 /* Return the length of string -- including null terminal byte */
-static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
-							void *addr, void *dest)
+static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+						 void *addr, void *dest)
 {
+	mm_segment_t old_fs;
 	int ret, len = 0;
 	u8 c;
-	mm_segment_t old_fs = get_fs();
 
+	old_fs = get_fs();
 	set_fs(KERNEL_DS);
 	pagefault_disable();
+
 	do {
 		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
 		len++;
 	} while (c && ret == 0 && len < MAX_STRING_SIZE);
+
 	pagefault_enable();
 	set_fs(old_fs);
 
@@ -263,210 +224,33 @@ static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 	else
 		*(u32 *)dest = len;
 }
-
-/* Memory fetching by symbol */
-struct symbol_cache {
-	char *symbol;
-	long offset;
-	unsigned long addr;
-};
-
-static unsigned long update_symbol_cache(struct symbol_cache *sc)
-{
-	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
-	if (sc->addr)
-		sc->addr += sc->offset;
-	return sc->addr;
-}
-
-static void free_symbol_cache(struct symbol_cache *sc)
-{
-	kfree(sc->symbol);
-	kfree(sc);
-}
-
-static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
-{
-	struct symbol_cache *sc;
-
-	if (!sym || strlen(sym) == 0)
-		return NULL;
-	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
-	if (!sc)
-		return NULL;
-
-	sc->symbol = kstrdup(sym, GFP_KERNEL);
-	if (!sc->symbol) {
-		kfree(sc);
-		return NULL;
-	}
-	sc->offset = offset;
-
-	update_symbol_cache(sc);
-	return sc;
-}
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string_size));
 
 #define DEFINE_FETCH_symbol(type)					\
-static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
-					  void *data, void *dest)	\
+void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, void *data, void *dest)\
 {									\
 	struct symbol_cache *sc = data;					\
 	if (sc->addr)							\
 		fetch_memory_##type(regs, (void *)sc->addr, dest);	\
 	else								\
 		*(type *)dest = 0;					\
-}
+}									\
+NOKPROBE_SYMBOL(FETCH_FUNC_NAME(symbol, type));
+
 DEFINE_BASIC_FETCH_FUNCS(symbol)
 DEFINE_FETCH_symbol(string)
 DEFINE_FETCH_symbol(string_size)
 
-/* Dereference memory access function */
-struct deref_fetch_param {
-	struct fetch_param orig;
-	long offset;
-};
-
-#define DEFINE_FETCH_deref(type)					\
-static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
-					    void *data, void *dest)	\
-{									\
-	struct deref_fetch_param *dprm = data;				\
-	unsigned long addr;						\
-	call_fetch(&dprm->orig, regs, &addr);				\
-	if (addr) {							\
-		addr += dprm->offset;					\
-		fetch_memory_##type(regs, (void *)addr, dest);		\
-	} else								\
-		*(type *)dest = 0;					\
-}
-DEFINE_BASIC_FETCH_FUNCS(deref)
-DEFINE_FETCH_deref(string)
-DEFINE_FETCH_deref(string_size)
-
-static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
-{
-	if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
-		update_deref_fetch_param(data->orig.data);
-	else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
-		update_symbol_cache(data->orig.data);
-}
-
-static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
-{
-	if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
-		free_deref_fetch_param(data->orig.data);
-	else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
-		free_symbol_cache(data->orig.data);
-	kfree(data);
-}
-
-/* Bitfield fetch function */
-struct bitfield_fetch_param {
-	struct fetch_param orig;
-	unsigned char hi_shift;
-	unsigned char low_shift;
-};
-
-#define DEFINE_FETCH_bitfield(type)					\
-static __kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs,\
-					    void *data, void *dest)	\
-{									\
-	struct bitfield_fetch_param *bprm = data;			\
-	type buf = 0;							\
-	call_fetch(&bprm->orig, regs, &buf);				\
-	if (buf) {							\
-		buf <<= bprm->hi_shift;					\
-		buf >>= bprm->low_shift;				\
-	}								\
-	*(type *)dest = buf;						\
-}
-DEFINE_BASIC_FETCH_FUNCS(bitfield)
-#define fetch_bitfield_string NULL
-#define fetch_bitfield_string_size NULL
-
-static __kprobes void
-update_bitfield_fetch_param(struct bitfield_fetch_param *data)
-{
-	/*
-	 * Don't check the bitfield itself, because this must be the
-	 * last fetch function.
-	 */
-	if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
-		update_deref_fetch_param(data->orig.data);
-	else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
-		update_symbol_cache(data->orig.data);
-}
-
-static __kprobes void
-free_bitfield_fetch_param(struct bitfield_fetch_param *data)
-{
-	/*
-	 * Don't check the bitfield itself, because this must be the
-	 * last fetch function.
-	 */
-	if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
-		free_deref_fetch_param(data->orig.data);
-	else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
-		free_symbol_cache(data->orig.data);
-	kfree(data);
-}
-
-/* Default (unsigned long) fetch type */
-#define __DEFAULT_FETCH_TYPE(t) u##t
-#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
-#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
-#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
-
-/* Fetch types */
-enum {
-	FETCH_MTD_reg = 0,
-	FETCH_MTD_stack,
-	FETCH_MTD_retval,
-	FETCH_MTD_memory,
-	FETCH_MTD_symbol,
-	FETCH_MTD_deref,
-	FETCH_MTD_bitfield,
-	FETCH_MTD_END,
-};
-
-#define ASSIGN_FETCH_FUNC(method, type)	\
-	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
-
-#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
-	{.name = _name,				\
-	 .size = _size,					\
-	 .is_signed = sign,				\
-	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
-	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
-	 .fmttype = _fmttype,				\
-	 .fetch = {					\
-ASSIGN_FETCH_FUNC(reg, ftype),				\
-ASSIGN_FETCH_FUNC(stack, ftype),			\
-ASSIGN_FETCH_FUNC(retval, ftype),			\
-ASSIGN_FETCH_FUNC(memory, ftype),			\
-ASSIGN_FETCH_FUNC(symbol, ftype),			\
-ASSIGN_FETCH_FUNC(deref, ftype),			\
-ASSIGN_FETCH_FUNC(bitfield, ftype),			\
-	  }						\
-	}
-
-#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
-	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
-
-#define FETCH_TYPE_STRING 0
-#define FETCH_TYPE_STRSIZE 1
+/* kprobes don't support file_offset fetch methods */
+#define fetch_file_offset_u8		NULL
+#define fetch_file_offset_u16		NULL
+#define fetch_file_offset_u32		NULL
+#define fetch_file_offset_u64		NULL
+#define fetch_file_offset_string	NULL
+#define fetch_file_offset_string_size	NULL
 
 /* Fetch type information table */
-static const struct fetch_type {
-	const char	*name;		/* Name of type */
-	size_t		size;		/* Byte size of type */
-	int		is_signed;	/* Signed flag */
-	print_type_func_t	print;	/* Print functions */
-	const char	*fmt;		/* Fromat string */
-	const char	*fmttype;	/* Name in format file */
-	/* Fetch functions */
-	fetch_func_t	fetch[FETCH_MTD_END];
-} fetch_type_table[] = {
+const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
 	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
 					sizeof(u32), 1, "__data_loc char[]"),
@@ -481,207 +265,49 @@ static const struct fetch_type {
 	ASSIGN_FETCH_TYPE(s16, u16, 1),
 	ASSIGN_FETCH_TYPE(s32, u32, 1),
 	ASSIGN_FETCH_TYPE(s64, u64, 1),
-};
-
-static const struct fetch_type *find_fetch_type(const char *type)
-{
-	int i;
 
-	if (!type)
-		type = DEFAULT_FETCH_TYPE_STR;
-
-	/* Special case: bitfield */
-	if (*type == 'b') {
-		unsigned long bs;
-		type = strchr(type, '/');
-		if (!type)
-			goto fail;
-		type++;
-		if (strict_strtoul(type, 0, &bs))
-			goto fail;
-		switch (bs) {
-		case 8:
-			return find_fetch_type("u8");
-		case 16:
-			return find_fetch_type("u16");
-		case 32:
-			return find_fetch_type("u32");
-		case 64:
-			return find_fetch_type("u64");
-		default:
-			goto fail;
-		}
-	}
-
-	for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
-		if (strcmp(type, fetch_type_table[i].name) == 0)
-			return &fetch_type_table[i];
-fail:
-	return NULL;
-}
-
-/* Special function : only accept unsigned long */
-static __kprobes void fetch_stack_address(struct pt_regs *regs,
-					  void *dummy, void *dest)
-{
-	*(unsigned long *)dest = kernel_stack_pointer(regs);
-}
-
-static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
-					    fetch_func_t orig_fn)
-{
-	int i;
-
-	if (type != &fetch_type_table[FETCH_TYPE_STRING])
-		return NULL;	/* Only string type needs size function */
-	for (i = 0; i < FETCH_MTD_END; i++)
-		if (type->fetch[i] == orig_fn)
-			return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
-
-	WARN_ON(1);	/* This should not happen */
-	return NULL;
-}
-
-/**
- * Kprobe event core functions
- */
-
-struct probe_arg {
-	struct fetch_param	fetch;
-	struct fetch_param	fetch_size;
-	unsigned int		offset;	/* Offset from argument entry */
-	const char		*name;	/* Name of this argument */
-	const char		*comm;	/* Command of this argument */
-	const struct fetch_type	*type;	/* Type of this argument */
+	ASSIGN_FETCH_TYPE_END
 };
 
-/* Flags for trace_probe */
-#define TP_FLAG_TRACE	1
-#define TP_FLAG_PROFILE	2
-#define TP_FLAG_REGISTERED 4
-
-struct trace_probe {
-	struct list_head	list;
-	struct kretprobe	rp;	/* Use rp.kp for kprobe use */
-	unsigned long 		nhit;
-	unsigned int		flags;	/* For TP_FLAG_* */
-	const char		*symbol;	/* symbol name */
-	struct ftrace_event_class	class;
-	struct ftrace_event_call	call;
-	ssize_t			size;		/* trace entry size */
-	unsigned int		nr_args;
-	struct probe_arg	args[];
-};
-
-#define SIZEOF_TRACE_PROBE(n)			\
-	(offsetof(struct trace_probe, args) +	\
-	(sizeof(struct probe_arg) * (n)))
-
-
-static __kprobes int trace_probe_is_return(struct trace_probe *tp)
-{
-	return tp->rp.handler != NULL;
-}
-
-static __kprobes const char *trace_probe_symbol(struct trace_probe *tp)
-{
-	return tp->symbol ? tp->symbol : "unknown";
-}
-
-static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp)
-{
-	return tp->rp.kp.offset;
-}
-
-static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp)
-{
-	return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
-}
-
-static __kprobes bool trace_probe_is_registered(struct trace_probe *tp)
-{
-	return !!(tp->flags & TP_FLAG_REGISTERED);
-}
-
-static __kprobes bool trace_probe_has_gone(struct trace_probe *tp)
-{
-	return !!(kprobe_gone(&tp->rp.kp));
-}
-
-static __kprobes bool trace_probe_within_module(struct trace_probe *tp,
-						struct module *mod)
-{
-	int len = strlen(mod->name);
-	const char *name = trace_probe_symbol(tp);
-	return strncmp(mod->name, name, len) == 0 && name[len] == ':';
-}
-
-static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp)
-{
-	return !!strchr(trace_probe_symbol(tp), ':');
-}
-
-static int register_probe_event(struct trace_probe *tp);
-static void unregister_probe_event(struct trace_probe *tp);
-
-static DEFINE_MUTEX(probe_lock);
-static LIST_HEAD(probe_list);
-
-static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
-static int kretprobe_dispatcher(struct kretprobe_instance *ri,
-				struct pt_regs *regs);
-
-/* Check the name is good for event/group/fields */
-static int is_good_name(const char *name)
-{
-	if (!isalpha(*name) && *name != '_')
-		return 0;
-	while (*++name != '\0') {
-		if (!isalpha(*name) && !isdigit(*name) && *name != '_')
-			return 0;
-	}
-	return 1;
-}
-
 /*
  * Allocate new trace_probe and initialize it (including kprobes).
  */
-static struct trace_probe *alloc_trace_probe(const char *group,
+static struct trace_kprobe *alloc_trace_kprobe(const char *group,
 					     const char *event,
 					     void *addr,
 					     const char *symbol,
 					     unsigned long offs,
-					     int nargs, int is_return)
+					     int nargs, bool is_return)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret = -ENOMEM;
 
-	tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
-	if (!tp)
+	tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL);
+	if (!tk)
 		return ERR_PTR(ret);
 
 	if (symbol) {
-		tp->symbol = kstrdup(symbol, GFP_KERNEL);
-		if (!tp->symbol)
+		tk->symbol = kstrdup(symbol, GFP_KERNEL);
+		if (!tk->symbol)
 			goto error;
-		tp->rp.kp.symbol_name = tp->symbol;
-		tp->rp.kp.offset = offs;
+		tk->rp.kp.symbol_name = tk->symbol;
+		tk->rp.kp.offset = offs;
 	} else
-		tp->rp.kp.addr = addr;
+		tk->rp.kp.addr = addr;
 
 	if (is_return)
-		tp->rp.handler = kretprobe_dispatcher;
+		tk->rp.handler = kretprobe_dispatcher;
 	else
-		tp->rp.kp.pre_handler = kprobe_dispatcher;
+		tk->rp.kp.pre_handler = kprobe_dispatcher;
 
 	if (!event || !is_good_name(event)) {
 		ret = -EINVAL;
 		goto error;
 	}
 
-	tp->call.class = &tp->class;
-	tp->call.name = kstrdup(event, GFP_KERNEL);
-	if (!tp->call.name)
+	tk->tp.call.class = &tk->tp.class;
+	tk->tp.call.name = kstrdup(event, GFP_KERNEL);
+	if (!tk->tp.call.name)
 		goto error;
 
 	if (!group || !is_good_name(group)) {
@@ -689,130 +315,166 @@ static struct trace_probe *alloc_trace_probe(const char *group,
 		goto error;
 	}
 
-	tp->class.system = kstrdup(group, GFP_KERNEL);
-	if (!tp->class.system)
+	tk->tp.class.system = kstrdup(group, GFP_KERNEL);
+	if (!tk->tp.class.system)
 		goto error;
 
-	INIT_LIST_HEAD(&tp->list);
-	return tp;
+	INIT_LIST_HEAD(&tk->list);
+	INIT_LIST_HEAD(&tk->tp.files);
+	return tk;
 error:
-	kfree(tp->call.name);
-	kfree(tp->symbol);
-	kfree(tp);
+	kfree(tk->tp.call.name);
+	kfree(tk->symbol);
+	kfree(tk);
 	return ERR_PTR(ret);
 }
 
-static void update_probe_arg(struct probe_arg *arg)
-{
-	if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
-		update_bitfield_fetch_param(arg->fetch.data);
-	else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
-		update_deref_fetch_param(arg->fetch.data);
-	else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
-		update_symbol_cache(arg->fetch.data);
-}
-
-static void free_probe_arg(struct probe_arg *arg)
-{
-	if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
-		free_bitfield_fetch_param(arg->fetch.data);
-	else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
-		free_deref_fetch_param(arg->fetch.data);
-	else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
-		free_symbol_cache(arg->fetch.data);
-	kfree(arg->name);
-	kfree(arg->comm);
-}
-
-static void free_trace_probe(struct trace_probe *tp)
+static void free_trace_kprobe(struct trace_kprobe *tk)
 {
 	int i;
 
-	for (i = 0; i < tp->nr_args; i++)
-		free_probe_arg(&tp->args[i]);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		traceprobe_free_probe_arg(&tk->tp.args[i]);
 
-	kfree(tp->call.class->system);
-	kfree(tp->call.name);
-	kfree(tp->symbol);
-	kfree(tp);
+	kfree(tk->tp.call.class->system);
+	kfree(tk->tp.call.name);
+	kfree(tk->symbol);
+	kfree(tk);
 }
 
-static struct trace_probe *find_trace_probe(const char *event,
-					    const char *group)
+static struct trace_kprobe *find_trace_kprobe(const char *event,
+					      const char *group)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 
-	list_for_each_entry(tp, &probe_list, list)
-		if (strcmp(tp->call.name, event) == 0 &&
-		    strcmp(tp->call.class->system, group) == 0)
-			return tp;
+	list_for_each_entry(tk, &probe_list, list)
+		if (strcmp(ftrace_event_name(&tk->tp.call), event) == 0 &&
+		    strcmp(tk->tp.call.class->system, group) == 0)
+			return tk;
 	return NULL;
 }
 
-/* Enable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */
-static int enable_trace_probe(struct trace_probe *tp, int flag)
+/*
+ * Enable trace_probe
+ * if the file is NULL, enable "perf" handler, or enable "trace" handler.
+ */
+static int
+enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
 {
 	int ret = 0;
 
-	tp->flags |= flag;
-	if (trace_probe_is_enabled(tp) && trace_probe_is_registered(tp) &&
-	    !trace_probe_has_gone(tp)) {
-		if (trace_probe_is_return(tp))
-			ret = enable_kretprobe(&tp->rp);
+	if (file) {
+		struct event_file_link *link;
+
+		link = kmalloc(sizeof(*link), GFP_KERNEL);
+		if (!link) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		link->file = file;
+		list_add_tail_rcu(&link->list, &tk->tp.files);
+
+		tk->tp.flags |= TP_FLAG_TRACE;
+	} else
+		tk->tp.flags |= TP_FLAG_PROFILE;
+
+	if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) {
+		if (trace_kprobe_is_return(tk))
+			ret = enable_kretprobe(&tk->rp);
 		else
-			ret = enable_kprobe(&tp->rp.kp);
+			ret = enable_kprobe(&tk->rp.kp);
 	}
-
+ out:
 	return ret;
 }
 
-/* Disable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */
-static void disable_trace_probe(struct trace_probe *tp, int flag)
+/*
+ * Disable trace_probe
+ * if the file is NULL, disable "perf" handler, or disable "trace" handler.
+ */
+static int
+disable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
 {
-	tp->flags &= ~flag;
-	if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) {
-		if (trace_probe_is_return(tp))
-			disable_kretprobe(&tp->rp);
+	struct event_file_link *link = NULL;
+	int wait = 0;
+	int ret = 0;
+
+	if (file) {
+		link = find_event_file_link(&tk->tp, file);
+		if (!link) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		list_del_rcu(&link->list);
+		wait = 1;
+		if (!list_empty(&tk->tp.files))
+			goto out;
+
+		tk->tp.flags &= ~TP_FLAG_TRACE;
+	} else
+		tk->tp.flags &= ~TP_FLAG_PROFILE;
+
+	if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) {
+		if (trace_kprobe_is_return(tk))
+			disable_kretprobe(&tk->rp);
 		else
-			disable_kprobe(&tp->rp.kp);
+			disable_kprobe(&tk->rp.kp);
+		wait = 1;
 	}
+ out:
+	if (wait) {
+		/*
+		 * Synchronize with kprobe_trace_func/kretprobe_trace_func
+		 * to ensure disabled (all running handlers are finished).
+		 * This is not only for kfree(), but also the caller,
+		 * trace_remove_event_call() supposes it for releasing
+		 * event_call related objects, which will be accessed in
+		 * the kprobe_trace_func/kretprobe_trace_func.
+		 */
+		synchronize_sched();
+		kfree(link);	/* Ignored if link == NULL */
+	}
+
+	return ret;
 }
 
 /* Internal register function - just handle k*probes and flags */
-static int __register_trace_probe(struct trace_probe *tp)
+static int __register_trace_kprobe(struct trace_kprobe *tk)
 {
 	int i, ret;
 
-	if (trace_probe_is_registered(tp))
+	if (trace_probe_is_registered(&tk->tp))
 		return -EINVAL;
 
-	for (i = 0; i < tp->nr_args; i++)
-		update_probe_arg(&tp->args[i]);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		traceprobe_update_arg(&tk->tp.args[i]);
 
 	/* Set/clear disabled flag according to tp->flag */
-	if (trace_probe_is_enabled(tp))
-		tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
+	if (trace_probe_is_enabled(&tk->tp))
+		tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
 	else
-		tp->rp.kp.flags |= KPROBE_FLAG_DISABLED;
+		tk->rp.kp.flags |= KPROBE_FLAG_DISABLED;
 
-	if (trace_probe_is_return(tp))
-		ret = register_kretprobe(&tp->rp);
+	if (trace_kprobe_is_return(tk))
+		ret = register_kretprobe(&tk->rp);
 	else
-		ret = register_kprobe(&tp->rp.kp);
+		ret = register_kprobe(&tk->rp.kp);
 
 	if (ret == 0)
-		tp->flags |= TP_FLAG_REGISTERED;
+		tk->tp.flags |= TP_FLAG_REGISTERED;
 	else {
 		pr_warning("Could not insert probe at %s+%lu: %d\n",
-			   trace_probe_symbol(tp), trace_probe_offset(tp), ret);
-		if (ret == -ENOENT && trace_probe_is_on_module(tp)) {
+			   trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret);
+		if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) {
 			pr_warning("This probe might be able to register after"
 				   "target module is loaded. Continue.\n");
 			ret = 0;
 		} else if (ret == -EILSEQ) {
 			pr_warning("Probing address(0x%p) is not an "
 				   "instruction boundary.\n",
-				   tp->rp.kp.addr);
+				   tk->rp.kp.addr);
 			ret = -EINVAL;
 		}
 	}
@@ -821,64 +483,68 @@ static int __register_trace_probe(struct trace_probe *tp)
 }
 
 /* Internal unregister function - just handle k*probes and flags */
-static void __unregister_trace_probe(struct trace_probe *tp)
+static void __unregister_trace_kprobe(struct trace_kprobe *tk)
 {
-	if (trace_probe_is_registered(tp)) {
-		if (trace_probe_is_return(tp))
-			unregister_kretprobe(&tp->rp);
+	if (trace_probe_is_registered(&tk->tp)) {
+		if (trace_kprobe_is_return(tk))
+			unregister_kretprobe(&tk->rp);
 		else
-			unregister_kprobe(&tp->rp.kp);
-		tp->flags &= ~TP_FLAG_REGISTERED;
+			unregister_kprobe(&tk->rp.kp);
+		tk->tp.flags &= ~TP_FLAG_REGISTERED;
 		/* Cleanup kprobe for reuse */
-		if (tp->rp.kp.symbol_name)
-			tp->rp.kp.addr = NULL;
+		if (tk->rp.kp.symbol_name)
+			tk->rp.kp.addr = NULL;
 	}
 }
 
 /* Unregister a trace_probe and probe_event: call with locking probe_lock */
-static int unregister_trace_probe(struct trace_probe *tp)
+static int unregister_trace_kprobe(struct trace_kprobe *tk)
 {
 	/* Enabled event can not be unregistered */
-	if (trace_probe_is_enabled(tp))
+	if (trace_probe_is_enabled(&tk->tp))
+		return -EBUSY;
+
+	/* Will fail if probe is being used by ftrace or perf */
+	if (unregister_kprobe_event(tk))
 		return -EBUSY;
 
-	__unregister_trace_probe(tp);
-	list_del(&tp->list);
-	unregister_probe_event(tp);
+	__unregister_trace_kprobe(tk);
+	list_del(&tk->list);
 
 	return 0;
 }
 
 /* Register a trace_probe and probe_event */
-static int register_trace_probe(struct trace_probe *tp)
+static int register_trace_kprobe(struct trace_kprobe *tk)
 {
-	struct trace_probe *old_tp;
+	struct trace_kprobe *old_tk;
 	int ret;
 
 	mutex_lock(&probe_lock);
 
 	/* Delete old (same name) event if exist */
-	old_tp = find_trace_probe(tp->call.name, tp->call.class->system);
-	if (old_tp) {
-		ret = unregister_trace_probe(old_tp);
+	old_tk = find_trace_kprobe(ftrace_event_name(&tk->tp.call),
+			tk->tp.call.class->system);
+	if (old_tk) {
+		ret = unregister_trace_kprobe(old_tk);
 		if (ret < 0)
 			goto end;
-		free_trace_probe(old_tp);
+		free_trace_kprobe(old_tk);
 	}
 
 	/* Register new event */
-	ret = register_probe_event(tp);
+	ret = register_kprobe_event(tk);
 	if (ret) {
 		pr_warning("Failed to register probe event(%d)\n", ret);
 		goto end;
 	}
 
 	/* Register k*probe */
-	ret = __register_trace_probe(tp);
+	ret = __register_trace_kprobe(tk);
 	if (ret < 0)
-		unregister_probe_event(tp);
+		unregister_kprobe_event(tk);
 	else
-		list_add_tail(&tp->list, &probe_list);
+		list_add_tail(&tk->list, &probe_list);
 
 end:
 	mutex_unlock(&probe_lock);
@@ -886,11 +552,11 @@ end:
 }
 
 /* Module notifier call back, checking event on the module */
-static int trace_probe_module_callback(struct notifier_block *nb,
+static int trace_kprobe_module_callback(struct notifier_block *nb,
 				       unsigned long val, void *data)
 {
 	struct module *mod = data;
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret;
 
 	if (val != MODULE_STATE_COMING)
@@ -898,15 +564,16 @@ static int trace_probe_module_callback(struct notifier_block *nb,
 
 	/* Update probes on coming module */
 	mutex_lock(&probe_lock);
-	list_for_each_entry(tp, &probe_list, list) {
-		if (trace_probe_within_module(tp, mod)) {
+	list_for_each_entry(tk, &probe_list, list) {
+		if (trace_kprobe_within_module(tk, mod)) {
 			/* Don't need to check busy - this should have gone. */
-			__unregister_trace_probe(tp);
-			ret = __register_trace_probe(tp);
+			__unregister_trace_kprobe(tk);
+			ret = __register_trace_kprobe(tk);
 			if (ret)
 				pr_warning("Failed to re-register probe %s on"
 					   "%s: %d\n",
-					   tp->call.name, mod->name, ret);
+					   ftrace_event_name(&tk->tp.call),
+					   mod->name, ret);
 		}
 	}
 	mutex_unlock(&probe_lock);
@@ -914,233 +581,12 @@ static int trace_probe_module_callback(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block trace_probe_module_nb = {
-	.notifier_call = trace_probe_module_callback,
+static struct notifier_block trace_kprobe_module_nb = {
+	.notifier_call = trace_kprobe_module_callback,
 	.priority = 1	/* Invoked after kprobe module callback */
 };
 
-/* Split symbol and offset. */
-static int split_symbol_offset(char *symbol, unsigned long *offset)
-{
-	char *tmp;
-	int ret;
-
-	if (!offset)
-		return -EINVAL;
-
-	tmp = strchr(symbol, '+');
-	if (tmp) {
-		/* skip sign because strict_strtol doesn't accept '+' */
-		ret = strict_strtoul(tmp + 1, 0, offset);
-		if (ret)
-			return ret;
-		*tmp = '\0';
-	} else
-		*offset = 0;
-	return 0;
-}
-
-#define PARAM_MAX_ARGS 16
-#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
-
-static int parse_probe_vars(char *arg, const struct fetch_type *t,
-			    struct fetch_param *f, int is_return)
-{
-	int ret = 0;
-	unsigned long param;
-
-	if (strcmp(arg, "retval") == 0) {
-		if (is_return)
-			f->fn = t->fetch[FETCH_MTD_retval];
-		else
-			ret = -EINVAL;
-	} else if (strncmp(arg, "stack", 5) == 0) {
-		if (arg[5] == '\0') {
-			if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0)
-				f->fn = fetch_stack_address;
-			else
-				ret = -EINVAL;
-		} else if (isdigit(arg[5])) {
-			ret = strict_strtoul(arg + 5, 10, &param);
-			if (ret || param > PARAM_MAX_STACK)
-				ret = -EINVAL;
-			else {
-				f->fn = t->fetch[FETCH_MTD_stack];
-				f->data = (void *)param;
-			}
-		} else
-			ret = -EINVAL;
-	} else
-		ret = -EINVAL;
-	return ret;
-}
-
-/* Recursive argument parser */
-static int __parse_probe_arg(char *arg, const struct fetch_type *t,
-			     struct fetch_param *f, int is_return)
-{
-	int ret = 0;
-	unsigned long param;
-	long offset;
-	char *tmp;
-
-	switch (arg[0]) {
-	case '$':
-		ret = parse_probe_vars(arg + 1, t, f, is_return);
-		break;
-	case '%':	/* named register */
-		ret = regs_query_register_offset(arg + 1);
-		if (ret >= 0) {
-			f->fn = t->fetch[FETCH_MTD_reg];
-			f->data = (void *)(unsigned long)ret;
-			ret = 0;
-		}
-		break;
-	case '@':	/* memory or symbol */
-		if (isdigit(arg[1])) {
-			ret = strict_strtoul(arg + 1, 0, &param);
-			if (ret)
-				break;
-			f->fn = t->fetch[FETCH_MTD_memory];
-			f->data = (void *)param;
-		} else {
-			ret = split_symbol_offset(arg + 1, &offset);
-			if (ret)
-				break;
-			f->data = alloc_symbol_cache(arg + 1, offset);
-			if (f->data)
-				f->fn = t->fetch[FETCH_MTD_symbol];
-		}
-		break;
-	case '+':	/* deref memory */
-		arg++;	/* Skip '+', because strict_strtol() rejects it. */
-	case '-':
-		tmp = strchr(arg, '(');
-		if (!tmp)
-			break;
-		*tmp = '\0';
-		ret = strict_strtol(arg, 0, &offset);
-		if (ret)
-			break;
-		arg = tmp + 1;
-		tmp = strrchr(arg, ')');
-		if (tmp) {
-			struct deref_fetch_param *dprm;
-			const struct fetch_type *t2 = find_fetch_type(NULL);
-			*tmp = '\0';
-			dprm = kzalloc(sizeof(struct deref_fetch_param),
-				       GFP_KERNEL);
-			if (!dprm)
-				return -ENOMEM;
-			dprm->offset = offset;
-			ret = __parse_probe_arg(arg, t2, &dprm->orig,
-						is_return);
-			if (ret)
-				kfree(dprm);
-			else {
-				f->fn = t->fetch[FETCH_MTD_deref];
-				f->data = (void *)dprm;
-			}
-		}
-		break;
-	}
-	if (!ret && !f->fn) {	/* Parsed, but do not find fetch method */
-		pr_info("%s type has no corresponding fetch method.\n",
-			t->name);
-		ret = -EINVAL;
-	}
-	return ret;
-}
-
-#define BYTES_TO_BITS(nb)	((BITS_PER_LONG * (nb)) / sizeof(long))
-
-/* Bitfield type needs to be parsed into a fetch function */
-static int __parse_bitfield_probe_arg(const char *bf,
-				      const struct fetch_type *t,
-				      struct fetch_param *f)
-{
-	struct bitfield_fetch_param *bprm;
-	unsigned long bw, bo;
-	char *tail;
-
-	if (*bf != 'b')
-		return 0;
-
-	bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
-	if (!bprm)
-		return -ENOMEM;
-	bprm->orig = *f;
-	f->fn = t->fetch[FETCH_MTD_bitfield];
-	f->data = (void *)bprm;
-
-	bw = simple_strtoul(bf + 1, &tail, 0);	/* Use simple one */
-	if (bw == 0 || *tail != '@')
-		return -EINVAL;
-
-	bf = tail + 1;
-	bo = simple_strtoul(bf, &tail, 0);
-	if (tail == bf || *tail != '/')
-		return -EINVAL;
-
-	bprm->hi_shift = BYTES_TO_BITS(t->size) - (bw + bo);
-	bprm->low_shift = bprm->hi_shift + bo;
-	return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
-}
-
-/* String length checking wrapper */
-static int parse_probe_arg(char *arg, struct trace_probe *tp,
-			   struct probe_arg *parg, int is_return)
-{
-	const char *t;
-	int ret;
-
-	if (strlen(arg) > MAX_ARGSTR_LEN) {
-		pr_info("Argument is too long.: %s\n",  arg);
-		return -ENOSPC;
-	}
-	parg->comm = kstrdup(arg, GFP_KERNEL);
-	if (!parg->comm) {
-		pr_info("Failed to allocate memory for command '%s'.\n", arg);
-		return -ENOMEM;
-	}
-	t = strchr(parg->comm, ':');
-	if (t) {
-		arg[t - parg->comm] = '\0';
-		t++;
-	}
-	parg->type = find_fetch_type(t);
-	if (!parg->type) {
-		pr_info("Unsupported type: %s\n", t);
-		return -EINVAL;
-	}
-	parg->offset = tp->size;
-	tp->size += parg->type->size;
-	ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
-	if (ret >= 0 && t != NULL)
-		ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
-	if (ret >= 0) {
-		parg->fetch_size.fn = get_fetch_size_function(parg->type,
-							      parg->fetch.fn);
-		parg->fetch_size.data = parg->fetch.data;
-	}
-	return ret;
-}
-
-/* Return 1 if name is reserved or already used by another argument */
-static int conflict_field_name(const char *name,
-			       struct probe_arg *args, int narg)
-{
-	int i;
-	for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
-		if (strcmp(reserved_field_names[i], name) == 0)
-			return 1;
-	for (i = 0; i < narg; i++)
-		if (strcmp(args[i].name, name) == 0)
-			return 1;
-	return 0;
-}
-
-static int create_trace_probe(int argc, char **argv)
+static int create_trace_kprobe(int argc, char **argv)
 {
 	/*
 	 * Argument syntax:
@@ -1160,9 +606,9 @@ static int create_trace_probe(int argc, char **argv)
 	 * Type of args:
 	 *  FETCHARG:TYPE : use TYPE instead of unsigned long.
 	 */
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int i, ret = 0;
-	int is_return = 0, is_delete = 0;
+	bool is_return = false, is_delete = false;
 	char *symbol = NULL, *event = NULL, *group = NULL;
 	char *arg;
 	unsigned long offset = 0;
@@ -1171,11 +617,11 @@ static int create_trace_probe(int argc, char **argv)
 
 	/* argc must be >= 1 */
 	if (argv[0][0] == 'p')
-		is_return = 0;
+		is_return = false;
 	else if (argv[0][0] == 'r')
-		is_return = 1;
+		is_return = true;
 	else if (argv[0][0] == '-')
-		is_delete = 1;
+		is_delete = true;
 	else {
 		pr_info("Probe definition must be started with 'p', 'r' or"
 			" '-'.\n");
@@ -1207,16 +653,16 @@ static int create_trace_probe(int argc, char **argv)
 			return -EINVAL;
 		}
 		mutex_lock(&probe_lock);
-		tp = find_trace_probe(event, group);
-		if (!tp) {
+		tk = find_trace_kprobe(event, group);
+		if (!tk) {
 			mutex_unlock(&probe_lock);
 			pr_info("Event %s/%s doesn't exist.\n", group, event);
 			return -ENOENT;
 		}
 		/* delete an event */
-		ret = unregister_trace_probe(tp);
+		ret = unregister_trace_kprobe(tk);
 		if (ret == 0)
-			free_trace_probe(tp);
+			free_trace_kprobe(tk);
 		mutex_unlock(&probe_lock);
 		return ret;
 	}
@@ -1231,7 +677,7 @@ static int create_trace_probe(int argc, char **argv)
 			return -EINVAL;
 		}
 		/* an address specified */
-		ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr);
+		ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr);
 		if (ret) {
 			pr_info("Failed to parse address.\n");
 			return ret;
@@ -1240,7 +686,7 @@ static int create_trace_probe(int argc, char **argv)
 		/* a symbol specified */
 		symbol = argv[1];
 		/* TODO: support .init module functions */
-		ret = split_symbol_offset(symbol, &offset);
+		ret = traceprobe_split_symbol_offset(symbol, &offset);
 		if (ret) {
 			pr_info("Failed to parse symbol.\n");
 			return ret;
@@ -1263,46 +709,49 @@ static int create_trace_probe(int argc, char **argv)
 				 is_return ? 'r' : 'p', addr);
 		event = buf;
 	}
-	tp = alloc_trace_probe(group, event, addr, symbol, offset, argc,
+	tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc,
 			       is_return);
-	if (IS_ERR(tp)) {
+	if (IS_ERR(tk)) {
 		pr_info("Failed to allocate trace_probe.(%d)\n",
-			(int)PTR_ERR(tp));
-		return PTR_ERR(tp);
+			(int)PTR_ERR(tk));
+		return PTR_ERR(tk);
 	}
 
 	/* parse arguments */
 	ret = 0;
 	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
 		/* Increment count for freeing args in error case */
-		tp->nr_args++;
+		tk->tp.nr_args++;
 
 		/* Parse argument name */
 		arg = strchr(argv[i], '=');
 		if (arg) {
 			*arg++ = '\0';
-			tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
+			parg->name = kstrdup(argv[i], GFP_KERNEL);
 		} else {
 			arg = argv[i];
 			/* If argument name is omitted, set "argN" */
 			snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
-			tp->args[i].name = kstrdup(buf, GFP_KERNEL);
+			parg->name = kstrdup(buf, GFP_KERNEL);
 		}
 
-		if (!tp->args[i].name) {
+		if (!parg->name) {
 			pr_info("Failed to allocate argument[%d] name.\n", i);
 			ret = -ENOMEM;
 			goto error;
 		}
 
-		if (!is_good_name(tp->args[i].name)) {
+		if (!is_good_name(parg->name)) {
 			pr_info("Invalid argument[%d] name: %s\n",
-				i, tp->args[i].name);
+				i, parg->name);
 			ret = -EINVAL;
 			goto error;
 		}
 
-		if (conflict_field_name(tp->args[i].name, tp->args, i)) {
+		if (traceprobe_conflict_field_name(parg->name,
+							tk->tp.args, i)) {
 			pr_info("Argument[%d] name '%s' conflicts with "
 				"another field.\n", i, argv[i]);
 			ret = -EINVAL;
@@ -1310,40 +759,43 @@ static int create_trace_probe(int argc, char **argv)
 		}
 
 		/* Parse fetch argument */
-		ret = parse_probe_arg(arg, tp, &tp->args[i], is_return);
+		ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg,
+						is_return, true);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;
 		}
 	}
 
-	ret = register_trace_probe(tp);
+	ret = register_trace_kprobe(tk);
 	if (ret)
 		goto error;
 	return 0;
 
 error:
-	free_trace_probe(tp);
+	free_trace_kprobe(tk);
 	return ret;
 }
 
-static int release_all_trace_probes(void)
+static int release_all_trace_kprobes(void)
 {
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
 	int ret = 0;
 
 	mutex_lock(&probe_lock);
 	/* Ensure no probe is in use. */
-	list_for_each_entry(tp, &probe_list, list)
-		if (trace_probe_is_enabled(tp)) {
+	list_for_each_entry(tk, &probe_list, list)
+		if (trace_probe_is_enabled(&tk->tp)) {
 			ret = -EBUSY;
 			goto end;
 		}
 	/* TODO: Use batch unregistration */
 	while (!list_empty(&probe_list)) {
-		tp = list_entry(probe_list.next, struct trace_probe, list);
-		unregister_trace_probe(tp);
-		free_trace_probe(tp);
+		tk = list_entry(probe_list.next, struct trace_kprobe, list);
+		ret = unregister_trace_kprobe(tk);
+		if (ret)
+			goto end;
+		free_trace_kprobe(tk);
 	}
 
 end:
@@ -1371,22 +823,23 @@ static void probes_seq_stop(struct seq_file *m, void *v)
 
 static int probes_seq_show(struct seq_file *m, void *v)
 {
-	struct trace_probe *tp = v;
+	struct trace_kprobe *tk = v;
 	int i;
 
-	seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p');
-	seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name);
+	seq_printf(m, "%c", trace_kprobe_is_return(tk) ? 'r' : 'p');
+	seq_printf(m, ":%s/%s", tk->tp.call.class->system,
+			ftrace_event_name(&tk->tp.call));
 
-	if (!tp->symbol)
-		seq_printf(m, " 0x%p", tp->rp.kp.addr);
-	else if (tp->rp.kp.offset)
-		seq_printf(m, " %s+%u", trace_probe_symbol(tp),
-			   tp->rp.kp.offset);
+	if (!tk->symbol)
+		seq_printf(m, " 0x%p", tk->rp.kp.addr);
+	else if (tk->rp.kp.offset)
+		seq_printf(m, " %s+%u", trace_kprobe_symbol(tk),
+			   tk->rp.kp.offset);
 	else
-		seq_printf(m, " %s", trace_probe_symbol(tp));
+		seq_printf(m, " %s", trace_kprobe_symbol(tk));
 
-	for (i = 0; i < tp->nr_args; i++)
-		seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm);
+	for (i = 0; i < tk->tp.nr_args; i++)
+		seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm);
 	seq_printf(m, "\n");
 
 	return 0;
@@ -1404,7 +857,7 @@ static int probes_open(struct inode *inode, struct file *file)
 	int ret;
 
 	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
-		ret = release_all_trace_probes();
+		ret = release_all_trace_kprobes();
 		if (ret < 0)
 			return ret;
 	}
@@ -1412,70 +865,11 @@ static int probes_open(struct inode *inode, struct file *file)
 	return seq_open(file, &probes_seq_op);
 }
 
-static int command_trace_probe(const char *buf)
-{
-	char **argv;
-	int argc = 0, ret = 0;
-
-	argv = argv_split(GFP_KERNEL, buf, &argc);
-	if (!argv)
-		return -ENOMEM;
-
-	if (argc)
-		ret = create_trace_probe(argc, argv);
-
-	argv_free(argv);
-	return ret;
-}
-
-#define WRITE_BUFSIZE 4096
-
 static ssize_t probes_write(struct file *file, const char __user *buffer,
 			    size_t count, loff_t *ppos)
 {
-	char *kbuf, *tmp;
-	int ret;
-	size_t done;
-	size_t size;
-
-	kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL);
-	if (!kbuf)
-		return -ENOMEM;
-
-	ret = done = 0;
-	while (done < count) {
-		size = count - done;
-		if (size >= WRITE_BUFSIZE)
-			size = WRITE_BUFSIZE - 1;
-		if (copy_from_user(kbuf, buffer + done, size)) {
-			ret = -EFAULT;
-			goto out;
-		}
-		kbuf[size] = '\0';
-		tmp = strchr(kbuf, '\n');
-		if (tmp) {
-			*tmp = '\0';
-			size = tmp - kbuf + 1;
-		} else if (done + size < count) {
-			pr_warning("Line length is too long: "
-				   "Should be less than %d.", WRITE_BUFSIZE);
-			ret = -EINVAL;
-			goto out;
-		}
-		done += size;
-		/* Remove comments */
-		tmp = strchr(kbuf, '#');
-		if (tmp)
-			*tmp = '\0';
-
-		ret = command_trace_probe(kbuf);
-		if (ret)
-			goto out;
-	}
-	ret = done;
-out:
-	kfree(kbuf);
-	return ret;
+	return traceprobe_probes_write(file, buffer, count, ppos,
+			create_trace_kprobe);
 }
 
 static const struct file_operations kprobe_events_ops = {
@@ -1490,10 +884,11 @@ static const struct file_operations kprobe_events_ops = {
 /* Probes profiling interfaces */
 static int probes_profile_seq_show(struct seq_file *m, void *v)
 {
-	struct trace_probe *tp = v;
+	struct trace_kprobe *tk = v;
 
-	seq_printf(m, "  %-44s %15lu %15lu\n", tp->call.name, tp->nhit,
-		   tp->rp.kp.nmissed);
+	seq_printf(m, "  %-44s %15lu %15lu\n",
+		   ftrace_event_name(&tk->tp.call), tk->nhit,
+		   tk->rp.kp.nmissed);
 
 	return 0;
 }
@@ -1518,122 +913,105 @@ static const struct file_operations kprobe_profile_ops = {
 	.release        = seq_release,
 };
 
-/* Sum up total data length for dynamic arraies (strings) */
-static __kprobes int __get_data_size(struct trace_probe *tp,
-				     struct pt_regs *regs)
-{
-	int i, ret = 0;
-	u32 len;
-
-	for (i = 0; i < tp->nr_args; i++)
-		if (unlikely(tp->args[i].fetch_size.fn)) {
-			call_fetch(&tp->args[i].fetch_size, regs, &len);
-			ret += len;
-		}
-
-	return ret;
-}
-
-/* Store the value of each argument */
-static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
-				       struct pt_regs *regs,
-				       u8 *data, int maxlen)
-{
-	int i;
-	u32 end = tp->size;
-	u32 *dl;	/* Data (relative) location */
-
-	for (i = 0; i < tp->nr_args; i++) {
-		if (unlikely(tp->args[i].fetch_size.fn)) {
-			/*
-			 * First, we set the relative location and
-			 * maximum data length to *dl
-			 */
-			dl = (u32 *)(data + tp->args[i].offset);
-			*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
-			/* Then try to fetch string or dynamic array data */
-			call_fetch(&tp->args[i].fetch, regs, dl);
-			/* Reduce maximum length */
-			end += get_rloc_len(*dl);
-			maxlen -= get_rloc_len(*dl);
-			/* Trick here, convert data_rloc to data_loc */
-			*dl = convert_rloc_to_loc(*dl,
-				 ent_size + tp->args[i].offset);
-		} else
-			/* Just fetching data normally */
-			call_fetch(&tp->args[i].fetch, regs,
-				   data + tp->args[i].offset);
-	}
-}
-
 /* Kprobe handler */
-static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
+static nokprobe_inline void
+__kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
+		    struct ftrace_event_file *ftrace_file)
 {
-	struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
 	struct kprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
 	int size, dsize, pc;
 	unsigned long irq_flags;
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 
-	tp->nhit++;
+	WARN_ON(call != ftrace_file->event_call);
+
+	if (ftrace_trigger_soft_disabled(ftrace_file))
+		return;
 
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	dsize = __get_data_size(tp, regs);
-	size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	size = sizeof(*entry) + tk->tp.size + dsize;
 
-	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size, irq_flags, pc);
+	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
+						call->event.type,
+						size, irq_flags, pc);
 	if (!event)
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->ip = (unsigned long)kp->addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	entry->ip = (unsigned long)tk->rp.kp.addr;
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
+
+	event_trigger_unlock_commit_regs(ftrace_file, buffer, event,
+					 entry, irq_flags, pc, regs);
+}
+
+static void
+kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs)
+{
+	struct event_file_link *link;
 
-	if (!filter_current_check_discard(buffer, call, entry, event))
-		trace_nowake_buffer_unlock_commit_regs(buffer, event,
-						       irq_flags, pc, regs);
+	list_for_each_entry_rcu(link, &tk->tp.files, list)
+		__kprobe_trace_func(tk, regs, link->file);
 }
+NOKPROBE_SYMBOL(kprobe_trace_func);
 
 /* Kretprobe handler */
-static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
-					  struct pt_regs *regs)
+static nokprobe_inline void
+__kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
+		       struct pt_regs *regs,
+		       struct ftrace_event_file *ftrace_file)
 {
-	struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
 	struct kretprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
 	int size, pc, dsize;
 	unsigned long irq_flags;
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
+
+	WARN_ON(call != ftrace_file->event_call);
+
+	if (ftrace_trigger_soft_disabled(ftrace_file))
+		return;
 
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	dsize = __get_data_size(tp, regs);
-	size = sizeof(*entry) + tp->size + dsize;
+	dsize = __get_data_size(&tk->tp, regs);
+	size = sizeof(*entry) + tk->tp.size + dsize;
 
-	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size, irq_flags, pc);
+	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
+						call->event.type,
+						size, irq_flags, pc);
 	if (!event)
 		return;
 
 	entry = ring_buffer_event_data(event);
-	entry->func = (unsigned long)tp->rp.kp.addr;
+	entry->func = (unsigned long)tk->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
+
+	event_trigger_unlock_commit_regs(ftrace_file, buffer, event,
+					 entry, irq_flags, pc, regs);
+}
+
+static void
+kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
+		     struct pt_regs *regs)
+{
+	struct event_file_link *link;
 
-	if (!filter_current_check_discard(buffer, call, entry, event))
-		trace_nowake_buffer_unlock_commit_regs(buffer, event,
-						       irq_flags, pc, regs);
+	list_for_each_entry_rcu(link, &tk->tp.files, list)
+		__kretprobe_trace_func(tk, ri, regs, link->file);
 }
+NOKPROBE_SYMBOL(kretprobe_trace_func);
 
 /* Event entry printers */
-enum print_line_t
+static enum print_line_t
 print_kprobe_event(struct trace_iterator *iter, int flags,
 		   struct trace_event *event)
 {
@@ -1646,7 +1024,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
 	field = (struct kprobe_trace_entry_head *)iter->ent;
 	tp = container_of(event, struct trace_probe, call.event);
 
-	if (!trace_seq_printf(s, "%s: (", tp->call.name))
+	if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
 		goto partial;
 
 	if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
@@ -1669,7 +1047,7 @@ partial:
 	return TRACE_TYPE_PARTIAL_LINE;
 }
 
-enum print_line_t
+static enum print_line_t
 print_kretprobe_event(struct trace_iterator *iter, int flags,
 		      struct trace_event *event)
 {
@@ -1682,7 +1060,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
 	field = (struct kretprobe_trace_entry_head *)iter->ent;
 	tp = container_of(event, struct trace_probe, call.event);
 
-	if (!trace_seq_printf(s, "%s: (", tp->call.name))
+	if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
 		goto partial;
 
 	if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
@@ -1711,31 +1089,23 @@ partial:
 	return TRACE_TYPE_PARTIAL_LINE;
 }
 
-#undef DEFINE_FIELD
-#define DEFINE_FIELD(type, item, name, is_signed)			\
-	do {								\
-		ret = trace_define_field(event_call, #type, name,	\
-					 offsetof(typeof(field), item),	\
-					 sizeof(field.item), is_signed, \
-					 FILTER_OTHER);			\
-		if (ret)						\
-			return ret;					\
-	} while (0)
 
 static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
 {
 	int ret, i;
 	struct kprobe_trace_entry_head field;
-	struct trace_probe *tp = (struct trace_probe *)event_call->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data;
 
 	DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
 	/* Set argument names as fields */
-	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
-					 tp->args[i].name,
-					 sizeof(field) + tp->args[i].offset,
-					 tp->args[i].type->size,
-					 tp->args[i].type->is_signed,
+	for (i = 0; i < tk->tp.nr_args; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name,
+					 sizeof(field) + parg->offset,
+					 parg->type->size,
+					 parg->type->is_signed,
 					 FILTER_OTHER);
 		if (ret)
 			return ret;
@@ -1747,17 +1117,19 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 {
 	int ret, i;
 	struct kretprobe_trace_entry_head field;
-	struct trace_probe *tp = (struct trace_probe *)event_call->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data;
 
 	DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
 	DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
 	/* Set argument names as fields */
-	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
-					 tp->args[i].name,
-					 sizeof(field) + tp->args[i].offset,
-					 tp->args[i].type->size,
-					 tp->args[i].type->is_signed,
+	for (i = 0; i < tk->tp.nr_args; i++) {
+		struct probe_arg *parg = &tk->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name,
+					 sizeof(field) + parg->offset,
+					 parg->type->size,
+					 parg->type->is_signed,
 					 FILTER_OTHER);
 		if (ret)
 			return ret;
@@ -1765,182 +1137,135 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
-{
-	int i;
-	int pos = 0;
-
-	const char *fmt, *arg;
-
-	if (!trace_probe_is_return(tp)) {
-		fmt = "(%lx)";
-		arg = "REC->" FIELD_STRING_IP;
-	} else {
-		fmt = "(%lx <- %lx)";
-		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
-	}
-
-	/* When len=0, we just calculate the needed length */
-#define LEN_OR_ZERO (len ? len - pos : 0)
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
-
-	for (i = 0; i < tp->nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tp->args[i].name, tp->args[i].type->fmt);
-	}
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-
-	for (i = 0; i < tp->nr_args; i++) {
-		if (strcmp(tp->args[i].type->name, "string") == 0)
-			pos += snprintf(buf + pos, LEN_OR_ZERO,
-					", __get_str(%s)",
-					tp->args[i].name);
-		else
-			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-					tp->args[i].name);
-	}
-
-#undef LEN_OR_ZERO
-
-	/* return the length of print_fmt */
-	return pos;
-}
-
-static int set_print_fmt(struct trace_probe *tp)
-{
-	int len;
-	char *print_fmt;
-
-	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tp, NULL, 0);
-	print_fmt = kmalloc(len + 1, GFP_KERNEL);
-	if (!print_fmt)
-		return -ENOMEM;
-
-	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tp, print_fmt, len + 1);
-	tp->call.print_fmt = print_fmt;
-
-	return 0;
-}
-
 #ifdef CONFIG_PERF_EVENTS
 
 /* Kprobe profile handler */
-static __kprobes void kprobe_perf_func(struct kprobe *kp,
-					 struct pt_regs *regs)
+static void
+kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	struct kprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	int size, __size, dsize;
 	int rctx;
 
-	dsize = __get_data_size(tp, regs);
-	__size = sizeof(*entry) + tp->size + dsize;
+	head = this_cpu_ptr(call->perf_events);
+	if (hlist_empty(head))
+		return;
+
+	dsize = __get_data_size(&tk->tp, regs);
+	__size = sizeof(*entry) + tk->tp.size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
-	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
-		     "profile buffer not large enough"))
-		return;
 
 	entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
 	if (!entry)
 		return;
 
-	entry->ip = (unsigned long)kp->addr;
+	entry->ip = (unsigned long)tk->rp.kp.addr;
 	memset(&entry[1], 0, dsize);
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
-
-	head = this_cpu_ptr(call->perf_events);
-	perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
+	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
+NOKPROBE_SYMBOL(kprobe_perf_func);
 
 /* Kretprobe profile handler */
-static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
-					    struct pt_regs *regs)
+static void
+kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
+		    struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	struct kretprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	int size, __size, dsize;
 	int rctx;
 
-	dsize = __get_data_size(tp, regs);
-	__size = sizeof(*entry) + tp->size + dsize;
+	head = this_cpu_ptr(call->perf_events);
+	if (hlist_empty(head))
+		return;
+
+	dsize = __get_data_size(&tk->tp, regs);
+	__size = sizeof(*entry) + tk->tp.size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
-	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
-		     "profile buffer not large enough"))
-		return;
 
 	entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
 	if (!entry)
 		return;
 
-	entry->func = (unsigned long)tp->rp.kp.addr;
+	entry->func = (unsigned long)tk->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
-
-	head = this_cpu_ptr(call->perf_events);
-	perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head);
+	store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
+	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
+NOKPROBE_SYMBOL(kretprobe_perf_func);
 #endif	/* CONFIG_PERF_EVENTS */
 
-static __kprobes
-int kprobe_register(struct ftrace_event_call *event, enum trace_reg type)
+/*
+ * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex.
+ *
+ * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe
+ * lockless, but we can't race with this __init function.
+ */
+static int kprobe_register(struct ftrace_event_call *event,
+			   enum trace_reg type, void *data)
 {
-	struct trace_probe *tp = (struct trace_probe *)event->data;
+	struct trace_kprobe *tk = (struct trace_kprobe *)event->data;
+	struct ftrace_event_file *file = data;
 
 	switch (type) {
 	case TRACE_REG_REGISTER:
-		return enable_trace_probe(tp, TP_FLAG_TRACE);
+		return enable_trace_kprobe(tk, file);
 	case TRACE_REG_UNREGISTER:
-		disable_trace_probe(tp, TP_FLAG_TRACE);
-		return 0;
+		return disable_trace_kprobe(tk, file);
 
 #ifdef CONFIG_PERF_EVENTS
 	case TRACE_REG_PERF_REGISTER:
-		return enable_trace_probe(tp, TP_FLAG_PROFILE);
+		return enable_trace_kprobe(tk, NULL);
 	case TRACE_REG_PERF_UNREGISTER:
-		disable_trace_probe(tp, TP_FLAG_PROFILE);
+		return disable_trace_kprobe(tk, NULL);
+	case TRACE_REG_PERF_OPEN:
+	case TRACE_REG_PERF_CLOSE:
+	case TRACE_REG_PERF_ADD:
+	case TRACE_REG_PERF_DEL:
 		return 0;
 #endif
 	}
 	return 0;
 }
 
-static __kprobes
-int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
+static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
+	struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp);
 
-	if (tp->flags & TP_FLAG_TRACE)
-		kprobe_trace_func(kp, regs);
+	tk->nhit++;
+
+	if (tk->tp.flags & TP_FLAG_TRACE)
+		kprobe_trace_func(tk, regs);
 #ifdef CONFIG_PERF_EVENTS
-	if (tp->flags & TP_FLAG_PROFILE)
-		kprobe_perf_func(kp, regs);
+	if (tk->tp.flags & TP_FLAG_PROFILE)
+		kprobe_perf_func(tk, regs);
 #endif
 	return 0;	/* We don't tweek kernel, so just return 0 */
 }
+NOKPROBE_SYMBOL(kprobe_dispatcher);
 
-static __kprobes
-int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
+static int
+kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
-	struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
+	struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp);
+
+	tk->nhit++;
 
-	if (tp->flags & TP_FLAG_TRACE)
-		kretprobe_trace_func(ri, regs);
+	if (tk->tp.flags & TP_FLAG_TRACE)
+		kretprobe_trace_func(tk, ri, regs);
 #ifdef CONFIG_PERF_EVENTS
-	if (tp->flags & TP_FLAG_PROFILE)
-		kretprobe_perf_func(ri, regs);
+	if (tk->tp.flags & TP_FLAG_PROFILE)
+		kretprobe_perf_func(tk, ri, regs);
 #endif
 	return 0;	/* We don't tweek kernel, so just return 0 */
 }
+NOKPROBE_SYMBOL(kretprobe_dispatcher);
 
 static struct trace_event_functions kretprobe_funcs = {
 	.trace		= print_kretprobe_event
@@ -1950,21 +1275,21 @@ static struct trace_event_functions kprobe_funcs = {
 	.trace		= print_kprobe_event
 };
 
-static int register_probe_event(struct trace_probe *tp)
+static int register_kprobe_event(struct trace_kprobe *tk)
 {
-	struct ftrace_event_call *call = &tp->call;
+	struct ftrace_event_call *call = &tk->tp.call;
 	int ret;
 
 	/* Initialize ftrace_event_call */
 	INIT_LIST_HEAD(&call->class->fields);
-	if (trace_probe_is_return(tp)) {
+	if (trace_kprobe_is_return(tk)) {
 		call->event.funcs = &kretprobe_funcs;
 		call->class->define_fields = kretprobe_event_define_fields;
 	} else {
 		call->event.funcs = &kprobe_funcs;
 		call->class->define_fields = kprobe_event_define_fields;
 	}
-	if (set_print_fmt(tp) < 0)
+	if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0)
 		return -ENOMEM;
 	ret = register_ftrace_event(&call->event);
 	if (!ret) {
@@ -1973,21 +1298,26 @@ static int register_probe_event(struct trace_probe *tp)
 	}
 	call->flags = 0;
 	call->class->reg = kprobe_register;
-	call->data = tp;
+	call->data = tk;
 	ret = trace_add_event_call(call);
 	if (ret) {
-		pr_info("Failed to register kprobe event: %s\n", call->name);
+		pr_info("Failed to register kprobe event: %s\n",
+			ftrace_event_name(call));
 		kfree(call->print_fmt);
 		unregister_ftrace_event(&call->event);
 	}
 	return ret;
 }
 
-static void unregister_probe_event(struct trace_probe *tp)
+static int unregister_kprobe_event(struct trace_kprobe *tk)
 {
+	int ret;
+
 	/* tp->event is unregistered in trace_remove_event_call() */
-	trace_remove_event_call(&tp->call);
-	kfree(tp->call.print_fmt);
+	ret = trace_remove_event_call(&tk->tp.call);
+	if (!ret)
+		kfree(tk->tp.call.print_fmt);
+	return ret;
 }
 
 /* Make a debugfs interface for controlling probe points */
@@ -1996,7 +1326,7 @@ static __init int init_kprobe_trace(void)
 	struct dentry *d_tracer;
 	struct dentry *entry;
 
-	if (register_module_notifier(&trace_probe_module_nb))
+	if (register_module_notifier(&trace_kprobe_module_nb))
 		return -EINVAL;
 
 	d_tracer = tracing_init_dentry();
@@ -2035,44 +1365,77 @@ static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
 	return a1 + a2 + a3 + a4 + a5 + a6;
 }
 
+static struct ftrace_event_file *
+find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr)
+{
+	struct ftrace_event_file *file;
+
+	list_for_each_entry(file, &tr->events, list)
+		if (file->event_call == &tk->tp.call)
+			return file;
+
+	return NULL;
+}
+
+/*
+ * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this
+ * stage, we can do this lockless.
+ */
 static __init int kprobe_trace_self_tests_init(void)
 {
 	int ret, warn = 0;
 	int (*target)(int, int, int, int, int, int);
-	struct trace_probe *tp;
+	struct trace_kprobe *tk;
+	struct ftrace_event_file *file;
+
+	if (tracing_is_disabled())
+		return -ENODEV;
 
 	target = kprobe_trace_selftest_target;
 
 	pr_info("Testing kprobe tracing: ");
 
-	ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "
-				  "$stack $stack0 +0($stack)");
+	ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target "
+				  "$stack $stack0 +0($stack)",
+				  create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
-		pr_warning("error on probing function entry.\n");
+		pr_warn("error on probing function entry.\n");
 		warn++;
 	} else {
 		/* Enable trace point */
-		tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
-		if (WARN_ON_ONCE(tp == NULL)) {
-			pr_warning("error on getting new probe.\n");
+		tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
+		if (WARN_ON_ONCE(tk == NULL)) {
+			pr_warn("error on getting new probe.\n");
 			warn++;
-		} else
-			enable_trace_probe(tp, TP_FLAG_TRACE);
+		} else {
+			file = find_trace_probe_file(tk, top_trace_array());
+			if (WARN_ON_ONCE(file == NULL)) {
+				pr_warn("error on getting probe file.\n");
+				warn++;
+			} else
+				enable_trace_kprobe(tk, file);
+		}
 	}
 
-	ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "
-				  "$retval");
+	ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target "
+				  "$retval", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
-		pr_warning("error on probing function return.\n");
+		pr_warn("error on probing function return.\n");
 		warn++;
 	} else {
 		/* Enable trace point */
-		tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
-		if (WARN_ON_ONCE(tp == NULL)) {
-			pr_warning("error on getting new probe.\n");
+		tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
+		if (WARN_ON_ONCE(tk == NULL)) {
+			pr_warn("error on getting 2nd new probe.\n");
 			warn++;
-		} else
-			enable_trace_probe(tp, TP_FLAG_TRACE);
+		} else {
+			file = find_trace_probe_file(tk, top_trace_array());
+			if (WARN_ON_ONCE(file == NULL)) {
+				pr_warn("error on getting probe file.\n");
+				warn++;
+			} else
+				enable_trace_kprobe(tk, file);
+		}
 	}
 
 	if (warn)
@@ -2081,34 +1444,46 @@ static __init int kprobe_trace_self_tests_init(void)
 	ret = target(1, 2, 3, 4, 5, 6);
 
 	/* Disable trace points before removing it */
-	tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
-	if (WARN_ON_ONCE(tp == NULL)) {
-		pr_warning("error on getting test probe.\n");
+	tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
+	if (WARN_ON_ONCE(tk == NULL)) {
+		pr_warn("error on getting test probe.\n");
 		warn++;
-	} else
-		disable_trace_probe(tp, TP_FLAG_TRACE);
+	} else {
+		file = find_trace_probe_file(tk, top_trace_array());
+		if (WARN_ON_ONCE(file == NULL)) {
+			pr_warn("error on getting probe file.\n");
+			warn++;
+		} else
+			disable_trace_kprobe(tk, file);
+	}
 
-	tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
-	if (WARN_ON_ONCE(tp == NULL)) {
-		pr_warning("error on getting 2nd test probe.\n");
+	tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM);
+	if (WARN_ON_ONCE(tk == NULL)) {
+		pr_warn("error on getting 2nd test probe.\n");
 		warn++;
-	} else
-		disable_trace_probe(tp, TP_FLAG_TRACE);
+	} else {
+		file = find_trace_probe_file(tk, top_trace_array());
+		if (WARN_ON_ONCE(file == NULL)) {
+			pr_warn("error on getting probe file.\n");
+			warn++;
+		} else
+			disable_trace_kprobe(tk, file);
+	}
 
-	ret = command_trace_probe("-:testprobe");
+	ret = traceprobe_command("-:testprobe", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
-		pr_warning("error on deleting a probe.\n");
+		pr_warn("error on deleting a probe.\n");
 		warn++;
 	}
 
-	ret = command_trace_probe("-:testprobe2");
+	ret = traceprobe_command("-:testprobe2", create_trace_kprobe);
 	if (WARN_ON_ONCE(ret)) {
-		pr_warning("error on deleting a probe.\n");
+		pr_warn("error on deleting a probe.\n");
 		warn++;
 	}
 
 end:
-	release_all_trace_probes();
+	release_all_trace_kprobes();
 	if (warn)
 		pr_cont("NG: Some tests are failed. Please check them.\n");
 	else