linux-kernel - Re: [PATCH 18/26] rv/rvgen: add fill_tracepoint_args

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Message-ID: <aXESFlL56FA0PyTZ@fedora>
Date: Wed, 21 Jan 2026 14:53:03 -0300
From: Wander Lairson Costa <wander@...hat.com>
To: Gabriele Monaco <gmonaco@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, Nam Cao <namcao@...utronix.de>, 
	open list <linux-kernel@...r.kernel.org>, 
	"open list:RUNTIME VERIFICATION (RV)" <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/26] rv/rvgen: add fill_tracepoint_args_skel stub to
 ltl2k

On Wed, Jan 21, 2026 at 02:57:02PM +0100, Gabriele Monaco wrote:
> On Mon, 2026-01-19 at 17:45 -0300, Wander Lairson Costa wrote:
> > The ltl2k class inherits from Monitor which requires subclasses to
> > implement fill_tracepoint_args_skel(). However, the ltl2k template
> > uses hardcoded tracepoint arguments rather than the placeholders that
> > this method would fill. The base class fill_trace_h() method calls
> > fill_tracepoint_args_skel() unconditionally, which was exposed when
> > the @not_implemented decorator was introduced.
> > 
> > Add a stub implementation that returns an empty string. Since the
> > ltl2k trace.h template does not contain the placeholder strings that
> > would be replaced, the empty return value has no effect on the
> > generated output while satisfying the base class interface contract.
> > 
> > Signed-off-by: Wander Lairson Costa <wander@...hat.com>
> 
> Mmh, this is a bit fishy though.
> We the patch using the decorator seems fine, but highlights how this method
> isn't meant to be in Monitor if not all monitors use it..
> Adding a stub here is just sweeping dust under the carpet.
> 
> Here should probably keep the common part of fill_trace_h() in Monitor (e.g.
> replacing MODEL_NAME and other common things) and create specific
> implementations in dot2k and ltl2k for what is not common while calling the
> super() counterpart for the rest.
> 
> Does it make sense to you?
> 

Yes, that is exactly my idea. Since the patch series were getting too
long and my brain too rot, I thought would be better addressing this in
a following up patch series. But I can work in the next version if you
are not ok with that approach.

> Thanks,
> Gabriele
> 
> > ---
> >  tools/verification/rvgen/rvgen/ltl2k.py | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/tools/verification/rvgen/rvgen/ltl2k.py
> > b/tools/verification/rvgen/rvgen/ltl2k.py
> > index 94dc64af1716d..f1eafc16c754b 100644
> > --- a/tools/verification/rvgen/rvgen/ltl2k.py
> > +++ b/tools/verification/rvgen/rvgen/ltl2k.py
> > @@ -257,6 +257,9 @@ class ltl2k(generator.Monitor):
> >  
> >          return '\n'.join(buf)
> >  
> > +    def fill_tracepoint_args_skel(self, tp_type) -> str:
> > +        return ""
> > +
> >      def fill_monitor_class_type(self):
> >          return "LTL_MON_EVENTS_ID"
> >  
>