Re: [PATCH v2] tools lib traceevent: Report better error message onbad function args

[Namhyung Kim]

On Tue, Nov 19, 2013 at 2:38 AM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> When Jiri Olsa was writing a function callback for
> scsi_trace_parse_cdb(), he thought that the traceevent library had a
> bug in it because he was getting this error:
>
>   Error: expected ')' but read ','
>   Error: expected ')' but read ','
>   Error: expected ')' but read ','
>   Error: expected ')' but read ','
>
> But in truth, he didn't have the write number of arguments for the
> function callback, and the error was the library detecting the
> discrepancy. A better error message would have prevented the confusion:
>
>   Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_timeout has more
>   Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_start has more
>   Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_error has more
>   Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_done has more
>
> Or
>
>   Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_timeout only uses 3
>   Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_start only uses 3
>   Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_error only uses 3
>   Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_done only uses 3

Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>

Thanks,
Namhyung
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