diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 1ab3089b5c5..73edf5a52e3 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -148,9 +148,9 @@ enum {
 };
 
 extern int trace_define_common_fields(struct ftrace_event_call *call);
-extern int trace_define_field(struct ftrace_event_call *call, char *type,
-			      char *name, int offset, int size, int is_signed,
-			      int filter_type);
+extern int trace_define_field(struct ftrace_event_call *call, const char *type,
+			      const char *name, int offset, int size,
+			      int is_signed, int filter_type);
 extern int trace_add_event_call(struct ftrace_event_call *call);
 extern void trace_remove_event_call(struct ftrace_event_call *call);
 
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 8079bb511c4..197cdaa96c4 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -27,8 +27,8 @@ DEFINE_MUTEX(event_mutex);
 
 LIST_HEAD(ftrace_events);
 
-int trace_define_field(struct ftrace_event_call *call, char *type,
-		       char *name, int offset, int size, int is_signed,
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+		       const char *name, int offset, int size, int is_signed,
 		       int filter_type)
 {
 	struct ftrace_event_field *field;
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 5931933587e..a928dd00453 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -193,8 +193,8 @@ int syscall_enter_define_fields(struct ftrace_event_call *call)
 		return ret;
 
 	for (i = 0; i < meta->nb_args; i++) {
-		ret = trace_define_field(call, (char *)meta->types[i],
-					 (char *)meta->args[i], offset,
+		ret = trace_define_field(call, meta->types[i],
+					 meta->args[i], offset,
 					 sizeof(unsigned long), 0,
 					 FILTER_OTHER);
 		offset += sizeof(unsigned long);