Re: [PATCH v2 04/11] rv: Add option for nested monitors and include sched

[Gabriele Monaco <gmonaco@redhat.com>]

On Mon, 2025-02-17 at 06:39 +0800, kernel test robot wrote:
> Hi Gabriele,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on 4dc1d1bec89864d8076e5ab314f86f46442bfb02]
> 
> url:   
> https://github.com/intel-lab-lkp/linux/commits/Gabriele-Monaco/tracing-Fix-DECLARE_TRACE_CONDITION/20250213-171642
> base:   4dc1d1bec89864d8076e5ab314f86f46442bfb02
> patch link:   
> https://lore.kernel.org/r/20250213090819.419470-5-gmonaco%40redhat.com
> patch subject: [PATCH v2 04/11] rv: Add option for nested monitors
> and include sched
> config: parisc-randconfig-r112-20250217
> (https://download.01.org/0day-ci/archive/20250217/202502170630.xSYE4c
> Uk-lkp@intel.com/config)
> compiler: hppa-linux-gcc (GCC) 14.2.0
> reproduce:
> (https://download.01.org/0day-ci/archive/20250217/202502170630.xSYE4c
> Uk-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new
> version of
> the same patch/commit), kindly add following tags
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes:
> > https://lore.kernel.org/oe-kbuild-all/202502170630.xSYE4cUk-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from include/trace/define_trace.h:119,
>                     from kernel/trace/rv/rv_trace.h:130,
>                     from kernel/trace/rv/rv.c:148:
> > > include/trace/trace_events.h:477:13: warning:
> > > 'print_fmt_error_da_monitor' defined but not used [-Wunused-
> > > variable]
>      477 | static char print_fmt_##call[] =
> print;                                 \
>          |             ^~~~~~~~~~
>    kernel/trace/rv/./rv_trace.h:39:1: note: in expansion of macro
> 'DECLARE_EVENT_CLASS'
>       39 | DECLARE_EVENT_CLASS(error_da_monitor,
>          | ^~~~~~~~~~~~~~~~~~~
> > > include/trace/trace_events.h:477:13: warning:
> > > 'print_fmt_event_da_monitor' defined but not used [-Wunused-
> > > variable]
>      477 | static char print_fmt_##call[] =
> print;                                 \
>          |             ^~~~~~~~~~
>    kernel/trace/rv/./rv_trace.h:12:1: note: in expansion of macro
> 'DECLARE_EVENT_CLASS'
>       12 | DECLARE_EVENT_CLASS(event_da_monitor,
>          | ^~~~~~~~~~~~~~~~~~~
> > > include/trace/trace_events.h:223:37: warning:
> > > 'trace_event_type_funcs_error_da_monitor' defined but not used [-
> > > Wunused-variable]
>      223 | static struct trace_event_functions
> trace_event_type_funcs_##call = {   \
>          |                                    
> ^~~~~~~~~~~~~~~~~~~~~~~
>    kernel/trace/rv/./rv_trace.h:39:1: note: in expansion of macro
> 'DECLARE_EVENT_CLASS'
>       39 | DECLARE_EVENT_CLASS(error_da_monitor,
>          | ^~~~~~~~~~~~~~~~~~~
> > > include/trace/trace_events.h:223:37: warning:
> > > 'trace_event_type_funcs_event_da_monitor' defined but not used [-
> > > Wunused-variable]
>      223 | static struct trace_event_functions
> trace_event_type_funcs_##call = {   \
>          |                                    
> ^~~~~~~~~~~~~~~~~~~~~~~
>    kernel/trace/rv/./rv_trace.h:12:1: note: in expansion of macro
> 'DECLARE_EVENT_CLASS'
>       12 | DECLARE_EVENT_CLASS(event_da_monitor,
>          | ^~~~~~~~~~~~~~~~~~~
> 

This is something hard to trigger, but I didn't remove the select
DA_MON_EVENTS_IMPLICIT in RV_MON_SCHED . As a result if the user
enables the sched monitor without any nested monitor (which is already
a broken configuration but happens if you apply this commit without the
following ones) trace event classes would be created with no event
using them.

I will send a V2 with the fix.