tracing: make event directory structure

This patch adds the directory /debug/tracing/events/ that will contain
all the registered trace points.

 # ls /debug/tracing/events/
sched_kthread_stop      sched_process_fork  sched_switch
sched_kthread_stop_ret  sched_process_free  sched_wait_task
sched_migrate_task      sched_process_wait  sched_wakeup
sched_process_exit      sched_signal_send   sched_wakeup_new

 # ls /debug/tracing/events/sched_switch/
enable

 # cat /debug/tracing/events/sched_switch/enable
1

 # cat /debug/tracing/set_event
sched_switch

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/kernel/trace/trace_events.h b/kernel/trace/trace_events.h
index 39342f86db27..cb8455b3ac9a 100644
--- a/kernel/trace/trace_events.h
+++ b/kernel/trace/trace_events.h
@@ -1,11 +1,13 @@
 #ifndef _LINUX_KERNEL_TRACE_EVENTS_H
 #define _LINUX_KERNEL_TRACE_EVENTS_H
 
+#include <linux/debugfs.h>
 #include <linux/ftrace.h>
 #include "trace.h"
 
 struct ftrace_event_call {
         char            *name;
+        struct dentry   *dir;
         int             enabled;
         int             (*regfunc)(void);
         void            (*unregfunc)(void);
@@ -39,6 +41,7 @@ static void ftrace_unreg_event_##call(void)				\
 }                                                                       \
                                                                         \
 static struct ftrace_event_call __used                                  \
+__attribute__((__aligned__(4)))                                         \
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
         .regfunc                = ftrace_reg_event_##call,              \
@@ -46,7 +49,7 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
 }
 
 void event_trace_printk(unsigned long ip, const char *fmt, ...);
-extern unsigned long __start_ftrace_events[];
-extern unsigned long __stop_ftrace_events[];
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
 
 #endif /* _LINUX_KERNEL_TRACE_EVENTS_H */