tracing: Restore the const qualifier for field names and types definition

Restore the const qualifier in field's name and type parameters of
trace_define_field that was lost while solving a conflict.

Fields names and types are defined as builtin constant strings in
static TRACE_EVENTs. But kprobes allocates these dynamically.

That said, we still want to always pass these strings as const char *
in trace_define_fields() to avoid any further accidental writes on
the pointed strings.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 1ab3089b5c59..73edf5a52e31 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);