8 files changed, 56 insertions, 48 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 39e71b0a3bfd..496eea898ee4 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -113,10 +113,14 @@ void tracing_record_cmdline(struct task_struct *tsk);
 
 struct event_filter;
 
+struct ftrace_event_class {
+        char                    *system;
+};
+
 struct ftrace_event_call {
         struct list_head        list;
+        struct ftrace_event_class *class;
         char                    *name;
-        char                    *system;
         struct dentry           *dir;
         struct trace_event      *event;
         int                     enabled;
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 057929b0a651..ac5791df2506 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -134,6 +134,8 @@ struct perf_event_attr;
 #define __SC_STR_TDECL5(t, a, ...)      #t, __SC_STR_TDECL4(__VA_ARGS__)
 #define __SC_STR_TDECL6(t, a, ...)      #t, __SC_STR_TDECL5(__VA_ARGS__)
 
+extern struct ftrace_event_class event_class_syscalls;
+
 #define SYSCALL_TRACE_ENTER_EVENT(sname)                                \
         static const struct syscall_metadata __syscall_meta_##sname;    \
         static struct ftrace_event_call                                 \
@@ -146,7 +148,7 @@ struct perf_event_attr;
           __attribute__((section("_ftrace_events")))                    \
           event_enter_##sname = {                                       \
                 .name                   = "sys_enter"#sname,            \
-                .system                 = "syscalls",                   \
+                .class                  = &event_class_syscalls,        \
                 .event                  = &enter_syscall_print_##sname, \
                 .raw_init               = init_syscall_trace,           \
                 .define_fields          = syscall_enter_define_fields,  \
@@ -168,7 +170,7 @@ struct perf_event_attr;
           __attribute__((section("_ftrace_events")))                    \
           event_exit_##sname = {                                        \
                 .name                   = "sys_exit"#sname,             \
-                .system                 = "syscalls",                   \
+                .class                  = &event_class_syscalls,        \
                 .event                  = &exit_syscall_print_##sname,  \
                 .raw_init               = init_syscall_trace,           \
                 .define_fields          = syscall_exit_define_fields,   \
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 75dd7787fb37..7dcdfd824aab 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -62,7 +62,10 @@
                 struct trace_entry      ent;                            \
                 tstruct                                                 \
                 char                    __data[0];                      \
-        };
+        };                                                              \
+                                                                        \
+        static struct ftrace_event_class event_class_##name;
+
 #undef DEFINE_EVENT
 #define DEFINE_EVENT(template, name, proto, args)       \
         static struct ftrace_event_call                 \
@@ -430,22 +433,6 @@ perf_trace_disable_##name(struct ftrace_event_call *unused)		\
  *
  * Override the macros in <trace/trace_events.h> to include the following:
  *
- * static void ftrace_event_<call>(proto)
- * {
- *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
- * }
- *
- * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
- * {
- *      return register_trace_<call>(ftrace_event_<call>);
- * }
- *
- * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
- * {
- *      unregister_trace_<call>(ftrace_event_<call>);
- * }
- *
- *
  * For those macros defined with TRACE_EVENT:
  *
  * static struct ftrace_event_call event_<call>;
@@ -497,17 +484,21 @@ perf_trace_disable_##name(struct ftrace_event_call *unused)		\
  *
  * static const char print_fmt_<call>[] = <TP_printk>;
  *
+ * static struct ftrace_event_class __used event_class_<template> = {
+ *      .system                 = "<system>",
+ * };
+ *
  * static struct ftrace_event_call __used
  * __attribute__((__aligned__(4)))
  * __attribute__((section("_ftrace_events"))) event_<call> = {
  *      .name                   = "<call>",
- *      .system                 = "<system>",
+ *      .class                  = event_class_<template>,
  *      .raw_init               = trace_event_raw_init,
- *      .regfunc                = ftrace_reg_event_<call>,
- *      .unregfunc              = ftrace_unreg_event_<call>,
+ *      .regfunc                = ftrace_raw_reg_event_<call>,
+ *      .unregfunc              = ftrace_raw_unreg_event_<call>,
  *      .print_fmt              = print_fmt_<call>,
  *      .define_fields          = ftrace_define_fields_<call>,
- * }
+ * };
  *
  */
 
@@ -627,7 +618,10 @@ static struct trace_event ftrace_event_type_##call = {			\
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
-static const char print_fmt_##call[] = print;
+static const char print_fmt_##call[] = print;                           \
+static struct ftrace_event_class __used event_class_##call = {          \
+        .system                 = __stringify(TRACE_SYSTEM)             \
+};
 
 #undef DEFINE_EVENT
 #define DEFINE_EVENT(template, call, proto, args)                       \
@@ -636,7 +630,7 @@ static struct ftrace_event_call __used					\
 __attribute__((__aligned__(4)))                                         \
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
-        .system                 = __stringify(TRACE_SYSTEM),            \
+        .class                  = &event_class_##template,              \
         .event                  = &ftrace_event_type_##call,            \
         .raw_init               = trace_event_raw_init,                 \
         .regfunc                = ftrace_raw_reg_event_##call,          \
@@ -644,7 +638,7 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
         .print_fmt              = print_fmt_##template,                 \
         .define_fields          = ftrace_define_fields_##template,      \
         _TRACE_PERF_INIT(call)                                  \
-}
+};
 
 #undef DEFINE_EVENT_PRINT
 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
@@ -655,7 +649,7 @@ static struct ftrace_event_call __used					\
 __attribute__((__aligned__(4)))                                         \
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
-        .system                 = __stringify(TRACE_SYSTEM),            \
+        .class                  = &event_class_##template,              \
         .event                  = &ftrace_event_type_##call,            \
         .raw_init               = trace_event_raw_init,                 \
         .regfunc                = ftrace_raw_reg_event_##call,          \
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index c697c7043349..2f54b48d3632 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -176,10 +176,10 @@ static int __ftrace_set_clr_event(const char *match, const char *sub,
 
                 if (match &&
                     strcmp(match, call->name) != 0 &&
-                    strcmp(match, call->system) != 0)
+                    strcmp(match, call->class->system) != 0)
                         continue;
 
-                if (sub && strcmp(sub, call->system) != 0)
+                if (sub && strcmp(sub, call->class->system) != 0)
                         continue;
 
                 if (event && strcmp(event, call->name) != 0)
@@ -355,8 +355,8 @@ static int t_show(struct seq_file *m, void *v)
 {
         struct ftrace_event_call *call = v;
 
-        if (strcmp(call->system, TRACE_SYSTEM) != 0)
-                seq_printf(m, "%s:", call->system);
+        if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
+                seq_printf(m, "%s:", call->class->system);
         seq_printf(m, "%s\n", call->name);
 
         return 0;
@@ -453,7 +453,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
                 if (!call->name || !call->regfunc)
                         continue;
 
-                if (system && strcmp(call->system, system) != 0)
+                if (system && strcmp(call->class->system, system) != 0)
                         continue;
 
                 /*
@@ -925,8 +925,8 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
          * If the trace point header did not define TRACE_SYSTEM
          * then the system would be called "TRACE_SYSTEM".
          */
-        if (strcmp(call->system, TRACE_SYSTEM) != 0)
-                d_events = event_subsystem_dir(call->system, d_events);
+        if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
+                d_events = event_subsystem_dir(call->class->system, d_events);
 
         call->dir = debugfs_create_dir(call->name, d_events);
         if (!call->dir) {
@@ -1041,7 +1041,7 @@ static void __trace_remove_event_call(struct ftrace_event_call *call)
         list_del(&call->list);
         trace_destroy_fields(call);
         destroy_preds(call);
-        remove_subsystem_dir(call->system);
+        remove_subsystem_dir(call->class->system);
 }
 
 /* Remove an event_call */
@@ -1399,8 +1399,8 @@ static __init void event_trace_self_tests(void)
  * syscalls as we test.
  */
 #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
-                if (call->system &&
-                    strcmp(call->system, "syscalls") == 0)
+                if (call->class->system &&
+                    strcmp(call->class->system, "syscalls") == 0)
                         continue;
 #endif
 
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 88c0b6dbd7fe..ca329603d0bf 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -628,7 +628,7 @@ static int init_subsystem_preds(struct event_subsystem *system)
                 if (!call->define_fields)
                         continue;
 
-                if (strcmp(call->system, system->name) != 0)
+                if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
                 err = init_preds(call);
@@ -647,7 +647,7 @@ static void filter_free_subsystem_preds(struct event_subsystem *system)
                 if (!call->define_fields)
                         continue;
 
-                if (strcmp(call->system, system->name) != 0)
+                if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
                 filter_disable_preds(call);
@@ -1252,7 +1252,7 @@ static int replace_system_preds(struct event_subsystem *system,
                 if (!call->define_fields)
                         continue;
 
-                if (strcmp(call->system, system->name) != 0)
+                if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
                 /* try to see if the filter can be applied */
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index e091f64ba6ce..7f16e2163817 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -18,6 +18,10 @@
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM    ftrace
 
+struct ftrace_event_class event_class_ftrace = {
+        .system                 = __stringify(TRACE_SYSTEM),
+};
+
 /* not needed for this file */
 #undef __field_struct
 #define __field_struct(type, item)
@@ -160,7 +164,7 @@ __attribute__((__aligned__(4)))						\
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
         .id                     = type,                                 \
-        .system                 = __stringify(TRACE_SYSTEM),            \
+        .class                  = &event_class_ftrace,                  \
         .raw_init               = ftrace_raw_init_event,                \
         .print_fmt              = print,                                \
         .define_fields          = ftrace_define_fields_##call,          \
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 1251e367bae9..eda220bf2065 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -332,8 +332,8 @@ static struct trace_probe *alloc_trace_probe(const char *group,
                 goto error;
         }
 
-        tp->call.system = kstrdup(group, GFP_KERNEL);
-        if (!tp->call.system)
+        tp->call.class->system = kstrdup(group, GFP_KERNEL);
+        if (!tp->call.class->system)
                 goto error;
 
         INIT_LIST_HEAD(&tp->list);
@@ -361,7 +361,7 @@ static void free_trace_probe(struct trace_probe *tp)
         for (i = 0; i < tp->nr_args; i++)
                 free_probe_arg(&tp->args[i]);
 
-        kfree(tp->call.system);
+        kfree(tp->call.class->system);
         kfree(tp->call.name);
         kfree(tp->symbol);
         kfree(tp);
@@ -374,7 +374,7 @@ static struct trace_probe *find_probe_event(const char *event,
 
         list_for_each_entry(tp, &probe_list, list)
                 if (strcmp(tp->call.name, event) == 0 &&
-                    strcmp(tp->call.system, group) == 0)
+                    strcmp(tp->call.class->system, group) == 0)
                         return tp;
         return NULL;
 }
@@ -399,7 +399,7 @@ static int register_trace_probe(struct trace_probe *tp)
         mutex_lock(&probe_lock);
 
         /* register as an event */
-        old_tp = find_probe_event(tp->call.name, tp->call.system);
+        old_tp = find_probe_event(tp->call.name, tp->call.class->system);
         if (old_tp) {
                 /* delete old event */
                 unregister_trace_probe(old_tp);
@@ -798,7 +798,7 @@ static int probes_seq_show(struct seq_file *m, void *v)
         char buf[MAX_ARGSTR_LEN + 1];
 
         seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p');
-        seq_printf(m, ":%s/%s", tp->call.system, tp->call.name);
+        seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name);
 
         if (!tp->symbol)
                 seq_printf(m, " 0x%p", tp->rp.kp.addr);
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 4d6d711717f2..d036a74a64f3 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -15,6 +15,10 @@ static int sys_refcount_exit;
 static DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
 static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
 
+struct ftrace_event_class event_class_syscalls = {
+        .system                 = "syscalls"
+};
+
 extern unsigned long __start_syscalls_metadata[];
 extern unsigned long __stop_syscalls_metadata[];