tracing: Accept different type for synthetic event fields

Make the synthetic event accepts a different type field to record.
However, the size and signed flag must be same.

Link: http://lkml.kernel.org/r/157867235358.17873.61732996461602171.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 0454aba..4f4759c 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -4110,8 +4110,11 @@ static int check_synth_field(struct synth_event *event,
 
        field = event->fields[field_pos];
 
-       if (strcmp(field->type, hist_field->type) != 0)
-               return -EINVAL;
+       if (strcmp(field->type, hist_field->type) != 0) {
+               if (field->size != hist_field->size ||
+                   field->is_signed != hist_field->is_signed)
+                       return -EINVAL;
+       }
 
        return 0;
 }