/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _LINUX_TRACEPOINT_H
#define _LINUX_TRACEPOINT_H

/*
 * Kernel Tracepoint API.
 *
 * See Documentation/trace/tracepoints.rst.
 *
 * Copyright (C) 2008-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Heavily inspired from the Linux Kernel Markers.
 */

#include <linux/smp.h>
#include <linux/srcu.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/rcupdate_trace.h>
#include <linux/tracepoint-defs.h>
#include <linux/static_call.h>

struct module;
struct tracepoint;
struct notifier_block;

struct trace_eval_map {
        const char              *system;
        const char              *eval_string;
        unsigned long           eval_value;
};

#define TRACEPOINT_DEFAULT_PRIO 10

extern int
tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
extern int
tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
                               int prio);
extern int
tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data,
                                         int prio);
extern int
tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
static inline int
tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe,
                                    void *data)
{
        return tracepoint_probe_register_prio_may_exist(tp, probe, data,
                                                        TRACEPOINT_DEFAULT_PRIO);
}
extern void
for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
                void *priv);

#ifdef CONFIG_MODULES
struct tp_module {
        struct list_head list;
        struct module *mod;
};

bool trace_module_has_bad_taint(struct module *mod);
extern int register_tracepoint_module_notifier(struct notifier_block *nb);
extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
                                        struct module *, void *),
                                void *priv);
void for_each_tracepoint_in_module(struct module *,
                                   void (*fct)(struct tracepoint *,
                                        struct module *, void *),
                                   void *priv);
#else
static inline bool trace_module_has_bad_taint(struct module *mod)
{
        return false;
}
static inline
int register_tracepoint_module_notifier(struct notifier_block *nb)
{
        return 0;
}
static inline
int unregister_tracepoint_module_notifier(struct notifier_block *nb)
{
        return 0;
}
static inline
void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
                                        struct module *, void *),
                                void *priv)
{
}
static inline
void for_each_tracepoint_in_module(struct module *mod,
                                   void (*fct)(struct tracepoint *,
                                        struct module *, void *),
                                   void *priv)
{
}
#endif /* CONFIG_MODULES */

/*
 * tracepoint_synchronize_unregister must be called between the last tracepoint
 * probe unregistration and the end of module exit to make sure there is no
 * caller executing a probe when it is freed.
 *
 * An alternative is to use the following for batch reclaim associated
 * with a given tracepoint:
 *
 * - tracepoint_is_faultable() == false: call_srcu()
 * - tracepoint_is_faultable() == true:  call_rcu_tasks_trace()
 */
#ifdef CONFIG_TRACEPOINTS
extern struct srcu_struct tracepoint_srcu;
static inline void tracepoint_synchronize_unregister(void)
{
        synchronize_rcu_tasks_trace();
        synchronize_srcu(&tracepoint_srcu);
}
static inline bool tracepoint_is_faultable(struct tracepoint *tp)
{
        return tp->ext && tp->ext->faultable;
}
/*
 * Run RCU callback with the appropriate grace period wait for non-faultable
 * tracepoints, e.g., those used in atomic context.
 */
static inline void call_tracepoint_unregister_atomic(struct rcu_head *rcu, rcu_callback_t func)
{
        call_srcu(&tracepoint_srcu, rcu, func);
}
/*
 * Run RCU callback with the appropriate grace period wait for faultable
 * tracepoints, e.g., those used in syscall context.
 */
static inline void call_tracepoint_unregister_syscall(struct rcu_head *rcu, rcu_callback_t func)
{
        call_rcu_tasks_trace(rcu, func);
}
#else
static inline void tracepoint_synchronize_unregister(void)
{ }
static inline bool tracepoint_is_faultable(struct tracepoint *tp)
{
        return false;
}
static inline void call_tracepoint_unregister_atomic(struct rcu_head *rcu, rcu_callback_t func)
{  }
static inline void call_tracepoint_unregister_syscall(struct rcu_head *rcu, rcu_callback_t func)
{  }
#endif

#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
extern int syscall_regfunc(void);
extern void syscall_unregfunc(void);
#endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */

#ifndef PARAMS
#define PARAMS(args...) args
#endif

#define TRACE_DEFINE_ENUM(x)
#define TRACE_DEFINE_SIZEOF(x)

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
{
        return offset_to_ptr(p);
}

#define __TRACEPOINT_ENTRY(name)                                        \
        asm("   .section \"__tracepoints_ptrs\", \"a\"          \n"     \
            "   .balign 4                                       \n"     \
            "   .long   __tracepoint_" #name " - .              \n"     \
            "   .previous                                       \n")
#else
static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
{
        return *p;
}

#define __TRACEPOINT_ENTRY(name)                                         \
        static tracepoint_ptr_t __tracepoint_ptr_##name __used           \
        __section("__tracepoints_ptrs") = &__tracepoint_##name
#endif

#endif /* _LINUX_TRACEPOINT_H */

/*
 * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
 *  file ifdef protection.
 *  This is due to the way trace events work. If a file includes two
 *  trace event headers under one "CREATE_TRACE_POINTS" the first include
 *  will override the TRACE_EVENT and break the second include.
 */

#ifndef DECLARE_TRACE

#define TP_PROTO(args...)       args
#define TP_ARGS(args...)        args
#define TP_CONDITION(args...)   args

/*
 * Individual subsystem my have a separate configuration to
 * enable their tracepoints. By default, this file will create
 * the tracepoints if CONFIG_TRACEPOINTS is defined. If a subsystem
 * wants to be able to disable its tracepoints from being created
 * it can define NOTRACE before including the tracepoint headers.
 */
#if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
#define TRACEPOINTS_ENABLED
#endif

#ifdef TRACEPOINTS_ENABLED

#ifdef CONFIG_HAVE_STATIC_CALL
#define __DO_TRACE_CALL(name, args)                                     \
        do {                                                            \
                struct tracepoint_func *it_func_ptr;                    \
                void *__data;                                           \
                it_func_ptr =                                           \
                        rcu_dereference_raw((&__tracepoint_##name)->funcs); \
                if (it_func_ptr) {                                      \
                        __data = (it_func_ptr)->data;                   \
                        static_call(tp_func_##name)(__data, args);      \
                }                                                       \
        } while (0)
#else
#define __DO_TRACE_CALL(name, args)     __traceiter_##name(NULL, args)
#endif /* CONFIG_HAVE_STATIC_CALL */

/*
 * Declare an exported function that Rust code can call to trigger this
 * tracepoint. This function does not include the static branch; that is done
 * in Rust to avoid a function call when the tracepoint is disabled.
 */
#define DEFINE_RUST_DO_TRACE(name, proto, args)
#define __DEFINE_RUST_DO_TRACE(name, proto, args)                       \
        notrace void rust_do_trace_##name(proto)                        \
        {                                                               \
                __do_trace_##name(args);                                \
        }

/*
 * When a tracepoint is used, it's name is added to the __tracepoint_check
 * section. This section is only used at build time to make sure all
 * defined tracepoints are used. It is discarded after the build.
 */
# define TRACEPOINT_CHECK(name)                                         \
        static const char __used __section("__tracepoint_check")        \
        __trace_check_##name[] = #name;

/*
 * Make sure the alignment of the structure in the __tracepoints section will
 * not add unwanted padding between the beginning of the section and the
 * structure. Force alignment to the same alignment as the section start.
 *
 * When lockdep is enabled, we make sure to always test if RCU is
 * "watching" regardless if the tracepoint is enabled or not. Tracepoints
 * require RCU to be active, and it should always warn at the tracepoint
 * site if it is not watching, as it will need to be active when the
 * tracepoint is enabled.
 */
#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto)           \
        extern int __traceiter_##name(data_proto);                      \
        DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name);        \
        extern struct tracepoint __tracepoint_##name;                   \
        extern void rust_do_trace_##name(proto);                        \
        static inline int                                               \
        register_trace_##name(void (*probe)(data_proto), void *data)    \
        {                                                               \
                return tracepoint_probe_register(&__tracepoint_##name,  \
                                                (void *)probe, data);   \
        }                                                               \
        static inline int                                               \
        register_trace_prio_##name(void (*probe)(data_proto), void *data,\
                                   int prio)                            \
        {                                                               \
                return tracepoint_probe_register_prio(&__tracepoint_##name, \
                                              (void *)probe, data, prio); \
        }                                                               \
        static inline int                                               \
        unregister_trace_##name(void (*probe)(data_proto), void *data)  \
        {                                                               \
                return tracepoint_probe_unregister(&__tracepoint_##name,\
                                                (void *)probe, data);   \
        }                                                               \
        static inline void                                              \
        check_trace_callback_type_##name(void (*cb)(data_proto))        \
        {                                                               \
        }                                                               \
        static inline bool                                              \
        trace_##name##_enabled(void)                                    \
        {                                                               \
                return static_branch_unlikely(&__tracepoint_##name.key);\
        }

#define __DECLARE_TRACE(name, proto, args, cond, data_proto)                    \
        __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \
        static inline void __do_trace_##name(proto)                     \
        {                                                               \
                TRACEPOINT_CHECK(name)                                  \
                if (cond) {                                             \
                        guard(srcu_fast_notrace)(&tracepoint_srcu);     \
                        __DO_TRACE_CALL(name, TP_ARGS(args));           \
                }                                                       \
        }                                                               \
        static inline void trace_##name(proto)                          \
        {                                                               \
                if (static_branch_unlikely(&__tracepoint_##name.key))   \
                        __do_trace_##name(args);                        \
                if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {             \
                        WARN_ONCE(!rcu_is_watching(),                   \
                                  "RCU not watching for tracepoint");   \
                }                                                       \
        }

#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto)          \
        __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \
        static inline void __do_trace_##name(proto)                     \
        {                                                               \
                TRACEPOINT_CHECK(name)                                  \
                guard(rcu_tasks_trace)();                               \
                __DO_TRACE_CALL(name, TP_ARGS(args));                   \
        }                                                               \
        static inline void trace_##name(proto)                          \
        {                                                               \
                might_fault();                                          \
                if (static_branch_unlikely(&__tracepoint_##name.key))   \
                        __do_trace_##name(args);                        \
                if (IS_ENABLED(CONFIG_LOCKDEP)) {                       \
                        WARN_ONCE(!rcu_is_watching(),                   \
                                  "RCU not watching for tracepoint");   \
                }                                                       \
        }

/*
 * We have no guarantee that gcc and the linker won't up-align the tracepoint
 * structures, so we create an array of pointers that will be used for iteration
 * on the tracepoints.
 *
 * it_func[0] is never NULL because there is at least one element in the array
 * when the array itself is non NULL.
 */
#define __DEFINE_TRACE_EXT(_name, _ext, proto, args)                    \
        static const char __tpstrtab_##_name[]                          \
        __section("__tracepoints_strings") = #_name;                    \
        extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \
        int __traceiter_##_name(void *__data, proto);                   \
        void __probestub_##_name(void *__data, proto);                  \
        struct tracepoint __tracepoint_##_name  __used                  \
        __section("__tracepoints") = {                                  \
                .name = __tpstrtab_##_name,                             \
                .key = STATIC_KEY_FALSE_INIT,                           \
                .static_call_key = &STATIC_CALL_KEY(tp_func_##_name),   \
                .static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
                .iterator = &__traceiter_##_name,                       \
                .probestub = &__probestub_##_name,                      \
                .funcs = NULL,                                          \
                .ext = _ext,                                            \
        };                                                              \
        __TRACEPOINT_ENTRY(_name);                                      \
        int __traceiter_##_name(void *__data, proto)                    \
        {                                                               \
                struct tracepoint_func *it_func_ptr;                    \
                void *it_func;                                          \
                                                                        \
                it_func_ptr =                                           \
                        rcu_dereference_raw((&__tracepoint_##_name)->funcs); \
                if (it_func_ptr) {                                      \
                        do {                                            \
                                it_func = READ_ONCE((it_func_ptr)->func); \
                                __data = (it_func_ptr)->data;           \
                                ((void(*)(void *, proto))(it_func))(__data, args); \
                        } while ((++it_func_ptr)->func);                \
                }                                                       \
                return 0;                                               \
        }                                                               \
        void __probestub_##_name(void *__data, proto)                   \
        {                                                               \
        }                                                               \
        DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);       \
        DEFINE_RUST_DO_TRACE(_name, TP_PROTO(proto), TP_ARGS(args))

#define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args)             \
        static struct tracepoint_ext __tracepoint_ext_##_name = {       \
                .regfunc = _reg,                                        \
                .unregfunc = _unreg,                                    \
                .faultable = false,                                     \
        };                                                              \
        __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));

#define DEFINE_TRACE_SYSCALL(_name, _reg, _unreg, _proto, _args)        \
        static struct tracepoint_ext __tracepoint_ext_##_name = {       \
                .regfunc = _reg,                                        \
                .unregfunc = _unreg,                                    \
                .faultable = true,                                      \
        };                                                              \
        __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args));

#define DEFINE_TRACE(_name, _proto, _args)                              \
        __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args));

#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)                              \
        TRACEPOINT_CHECK(name)                                          \
        EXPORT_SYMBOL_GPL(__tracepoint_##name);                         \
        EXPORT_SYMBOL_GPL(__traceiter_##name);                          \
        EXPORT_STATIC_CALL_GPL(tp_func_##name)
#define EXPORT_TRACEPOINT_SYMBOL(name)                                  \
        TRACEPOINT_CHECK(name)                                          \
        EXPORT_SYMBOL(__tracepoint_##name);                             \
        EXPORT_SYMBOL(__traceiter_##name);                              \
        EXPORT_STATIC_CALL(tp_func_##name)


#else /* !TRACEPOINTS_ENABLED */
#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto)           \
        static inline void trace_##name(proto)                          \
        { }                                                             \
        static inline int                                               \
        register_trace_##name(void (*probe)(data_proto),                \
                              void *data)                               \
        {                                                               \
                return -ENOSYS;                                         \
        }                                                               \
        static inline int                                               \
        unregister_trace_##name(void (*probe)(data_proto),              \
                                void *data)                             \
        {                                                               \
                return -ENOSYS;                                         \
        }                                                               \
        static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
        {                                                               \
        }                                                               \
        static inline bool                                              \
        trace_##name##_enabled(void)                                    \
        {                                                               \
                return false;                                           \
        }

#define __DECLARE_TRACE(name, proto, args, cond, data_proto)            \
        __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))

#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto)          \
        __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))

#define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
#define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args)
#define DEFINE_TRACE(name, proto, args)
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
#define EXPORT_TRACEPOINT_SYMBOL(name)

#endif /* TRACEPOINTS_ENABLED */

#ifdef CONFIG_TRACING
/**
 * tracepoint_string - register constant persistent string to trace system
 * @str - a constant persistent string that will be referenced in tracepoints
 *
 * If constant strings are being used in tracepoints, it is faster and
 * more efficient to just save the pointer to the string and reference
 * that with a printf "%s" instead of saving the string in the ring buffer
 * and wasting space and time.
 *
 * The problem with the above approach is that userspace tools that read
 * the binary output of the trace buffers do not have access to the string.
 * Instead they just show the address of the string which is not very
 * useful to users.
 *
 * With tracepoint_string(), the string will be registered to the tracing
 * system and exported to userspace via the debugfs/tracing/printk_formats
 * file that maps the string address to the string text. This way userspace
 * tools that read the binary buffers have a way to map the pointers to
 * the ASCII strings they represent.
 *
 * The @str used must be a constant string and persistent as it would not
 * make sense to show a string that no longer exists. But it is still fine
 * to be used with modules, because when modules are unloaded, if they
 * had tracepoints, the ring buffers are cleared too. As long as the string
 * does not change during the life of the module, it is fine to use
 * tracepoint_string() within a module.
 */
#define tracepoint_string(str)                                          \
        ({                                                              \
                static const char *___tp_str __tracepoint_string = str; \
                ___tp_str;                                              \
        })
#define __tracepoint_string     __used __section("__tracepoint_str")
#else
/*
 * tracepoint_string() is used to save the string address for userspace
 * tracing tools. When tracing isn't configured, there's no need to save
 * anything.
 */
# define tracepoint_string(str) str
# define __tracepoint_string
#endif

#define DECLARE_TRACE(name, proto, args)                                \
        __DECLARE_TRACE(name##_tp, PARAMS(proto), PARAMS(args),         \
                        cpu_online(raw_smp_processor_id()),             \
                        PARAMS(void *__data, proto))

#define DECLARE_TRACE_CONDITION(name, proto, args, cond)                \
        __DECLARE_TRACE(name##_tp, PARAMS(proto), PARAMS(args),         \
                        cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
                        PARAMS(void *__data, proto))

#define DECLARE_TRACE_SYSCALL(name, proto, args)                        \
        __DECLARE_TRACE_SYSCALL(name##_tp, PARAMS(proto), PARAMS(args), \
                                PARAMS(void *__data, proto))

#define DECLARE_TRACE_EVENT(name, proto, args)                          \
        __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),              \
                        cpu_online(raw_smp_processor_id()),             \
                        PARAMS(void *__data, proto))

#define DECLARE_TRACE_EVENT_CONDITION(name, proto, args, cond)          \
        __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),              \
                        cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
                        PARAMS(void *__data, proto))

#define DECLARE_TRACE_EVENT_SYSCALL(name, proto, args)                  \
        __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args),      \
                                PARAMS(void *__data, proto))

#define TRACE_EVENT_FLAGS(event, flag)

#define TRACE_EVENT_PERF_PERM(event, expr...)

#endif /* DECLARE_TRACE */

#ifndef TRACE_EVENT
/*
 * For use with the TRACE_EVENT macro:
 *
 * We define a tracepoint, its arguments, its printk format
 * and its 'fast binary record' layout.
 *
 * Firstly, name your tracepoint via TRACE_EVENT(name : the
 * 'subsystem_event' notation is fine.
 *
 * Think about this whole construct as the
 * 'trace_sched_switch() function' from now on.
 *
 *
 *  TRACE_EVENT(sched_switch,
 *
 *      *
 *      * A function has a regular function arguments
 *      * prototype, declare it via TP_PROTO():
 *      *
 *
 *      TP_PROTO(struct rq *rq, struct task_struct *prev,
 *               struct task_struct *next),
 *
 *      *
 *      * Define the call signature of the 'function'.
 *      * (Design sidenote: we use this instead of a
 *      *  TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
 *      *
 *
 *      TP_ARGS(rq, prev, next),
 *
 *      *
 *      * Fast binary tracing: define the trace record via
 *      * TP_STRUCT__entry(). You can think about it like a
 *      * regular C structure local variable definition.
 *      *
 *      * This is how the trace record is structured and will
 *      * be saved into the ring buffer. These are the fields
 *      * that will be exposed to user-space in
 *      * /sys/kernel/tracing/events/<*>/format.
 *      *
 *      * The declared 'local variable' is called '__entry'
 *      *
 *      * __field(pid_t, prev_pid) is equivalent to a standard declaration:
 *      *
 *      *       pid_t   prev_pid;
 *      *
 *      * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
 *      *
 *      *       char    prev_comm[TASK_COMM_LEN];
 *      *
 *
 *      TP_STRUCT__entry(
 *              __array(        char,   prev_comm,      TASK_COMM_LEN   )
 *              __field(        pid_t,  prev_pid                        )
 *              __field(        int,    prev_prio                       )
 *              __array(        char,   next_comm,      TASK_COMM_LEN   )
 *              __field(        pid_t,  next_pid                        )
 *              __field(        int,    next_prio                       )
 *      ),
 *
 *      *
 *      * Assign the entry into the trace record, by embedding
 *      * a full C statement block into TP_fast_assign(). You
 *      * can refer to the trace record as '__entry' -
 *      * otherwise you can put arbitrary C code in here.
 *      *
 *      * Note: this C code will execute every time a trace event
 *      * happens, on an active tracepoint.
 *      *
 *
 *      TP_fast_assign(
 *              memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
 *              __entry->prev_pid       = prev->pid;
 *              __entry->prev_prio      = prev->prio;
 *              memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
 *              __entry->next_pid       = next->pid;
 *              __entry->next_prio      = next->prio;
 *      ),
 *
 *      *
 *      * Formatted output of a trace record via TP_printk().
 *      * This is how the tracepoint will appear under ftrace
 *      * plugins that make use of this tracepoint.
 *      *
 *      * (raw-binary tracing wont actually perform this step.)
 *      *
 *
 *      TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
 *              __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
 *              __entry->next_comm, __entry->next_pid, __entry->next_prio),
 *
 * );
 *
 * This macro construct is thus used for the regular printk format
 * tracing setup, it is used to construct a function pointer based
 * tracepoint callback (this is used by programmatic plugins and
 * can also by used by generic instrumentation like SystemTap), and
 * it is also used to expose a structured trace record in
 * /sys/kernel/tracing/events/.
 *
 * A set of (un)registration functions can be passed to the variant
 * TRACE_EVENT_FN to perform any (un)registration work.
 */

#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT(template, name, proto, args)               \
        DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
        DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
        DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_CONDITION(template, name, proto,           \
                               args, cond)                      \
        DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto),      \
                                PARAMS(args), PARAMS(cond))

#define TRACE_EVENT(name, proto, args, struct, assign, print)   \
        DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT_FN(name, proto, args, struct,               \
                assign, print, reg, unreg)                      \
        DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT_FN_COND(name, proto, args, cond, struct,    \
                assign, print, reg, unreg)                      \
        DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto),      \
                        PARAMS(args), PARAMS(cond))
#define TRACE_EVENT_CONDITION(name, proto, args, cond,          \
                              struct, assign, print)            \
        DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto),      \
                                PARAMS(args), PARAMS(cond))
#define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign,  \
                            print, reg, unreg)                  \
        DECLARE_TRACE_EVENT_SYSCALL(name, PARAMS(proto), PARAMS(args))

#define TRACE_EVENT_FLAGS(event, flag)

#define TRACE_EVENT_PERF_PERM(event, expr...)

#define DECLARE_EVENT_NOP(name, proto, args)                            \
        static inline void trace_##name(proto)                          \
        { }                                                             \
        static inline bool trace_##name##_enabled(void)                 \
        {                                                               \
                return false;                                           \
        }

#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)       \
        DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))

#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT_NOP(template, name, proto, args)                   \
        DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))

#endif /* ifdef TRACE_EVENT (see note above) */