trace_syscalls: Remove duplicate init_enter_##sname()

use only one init_syscall_trace instead of
many init_enter_##sname()/init_exit_##sname()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B14D29B.6090708@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 144cc14d..c651409 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -412,6 +412,18 @@
 	mutex_unlock(&syscall_trace_lock);
 }
 
+int init_syscall_trace(struct ftrace_event_call *call)
+{
+	int id;
+
+	id = register_ftrace_event(call->event);
+	if (!id)
+		return -ENODEV;
+	call->id = id;
+	INIT_LIST_HEAD(&call->fields);
+	return 0;
+}
+
 int __init init_ftrace_syscalls(void)
 {
 	struct syscall_metadata *meta;