tracing: Add ftrace_event_call void * 'data' field

add an optional void * pointer to 'ftrace_event_call' that is
passed in for regfunc and unregfunc.

This prepares for syscall tracepoints creation by passing the name of
the syscall we want to trace and then retrieve its number through our
arch syscall table.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index ac8c6f8cf242..8544f121d9f1 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -112,8 +112,8 @@ struct ftrace_event_call {
         struct dentry           *dir;
         struct trace_event      *event;
         int                     enabled;
-        int                     (*regfunc)(void);
-        void                    (*unregfunc)(void);
+        int                     (*regfunc)(void *);
+        void                    (*unregfunc)(void *);
         int                     id;
         int                     (*raw_init)(void);
         int                     (*show_format)(struct trace_seq *s);
@@ -122,6 +122,7 @@ struct ftrace_event_call {
         int                     filter_active;
         struct event_filter     *filter;
         void                    *mod;
+        void                    *data;
 
         atomic_t                profile_count;
         int                     (*profile_enable)(struct ftrace_event_call *);