Re: [PATCH V9 01/16] rv: Add Runtime Verification (RV) interface

[Tao Zhou]

On Sat, Jul 30, 2022 at 01:01:45PM -0400, Steven Rostedt wrote:
> #define rv_attach_trace_probe(monitor, tp, rv_handler)                                  \
>         ({                                                                            \
>                 check_trace_callback_type_##tp(rv_handler);                             \
>                 WARN_ONCE(register_trace_##tp(rv_handler, NULL),                        \
>                                 "fail attaching " #monitor " " #tp "handler");          \
>         })
> 
> Where the macro returns the result of the WARN_ONCE() which is zero on
> success (no warning) and non-zero otherwise.

The modification of macro make sense to me even though I do not know trace enough. Thanks,