tracing/kprobe: Show sign of fields in trace_kprobe format files

The format files of trace_kprobe do not show the sign of the fields.
The other format files show the field signed type of the fields and
this patch makes the trace_kprobe formats consistent with the others.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4B273D27.5040009@cn.fujitsu.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace_kprobe.c

@@ -1182,10 +1182,11 @@ static int __probe_event_show_format(struct trace_seq *s,
 #undef SHOW_FIELD
 #define SHOW_FIELD(type, item, name)					\
 	do {								\
-		ret = trace_seq_printf(s, "\tfield: " #type " %s;\t"	\
-				"offset:%u;\tsize:%u;\n", name,		\
+		ret = trace_seq_printf(s, "\tfield:" #type " %s;\t"	\
+				"offset:%u;\tsize:%u;\tsigned:%d;\n", name,\
 				(unsigned int)offsetof(typeof(field), item),\
-				(unsigned int)sizeof(type));		\
+				(unsigned int)sizeof(type),		\
+				is_signed_type(type));			\
 		if (!ret)						\
 			return 0;					\
 	} while (0)