linux-kernel - [for-next][PATCH 03/25] rv/ltl: Do not execute the Buchi automaton twice on start condition

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Message-ID: <20250725203424.446385917@kernel.org>
Date: Fri, 25 Jul 2025 16:34:00 -0400
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Tomas Glozar <tglozar@...hat.com>,
 John Kacur <jkacur@...hat.com>,
 John Ogness <john.ogness@...utronix.de>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Gabriele Monaco <gmonaco@...hat.com>,
 Nam Cao <namcao@...utronix.de>
Subject: [for-next][PATCH 03/25] rv/ltl: Do not execute the Buchi automaton twice on start condition

From: Nam Cao <namcao@...utronix.de>

On start condition of a Buchi automaton, the automaton is executed twice.

This is fine for now, as all the current LTL operators do not care about
this. But it would break the 'next' operator, which will be introduced in a
follow-up patch.

Prepare for the introduction of the 'next' operator, only execute the
automaton once on start condition.

Cc: John Ogness <john.ogness@...utronix.de>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Gabriele Monaco <gmonaco@...hat.com>
Link: https://lore.kernel.org/9379f4e7b9c1c69a6dca3e20a22936c850a25ca7.1752239482.git.namcao@linutronix.de
Signed-off-by: Nam Cao <namcao@...utronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/rv/ltl_monitor.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/rv/ltl_monitor.h b/include/rv/ltl_monitor.h
index 9a583125b566..67031a774e3d 100644
--- a/include/rv/ltl_monitor.h
+++ b/include/rv/ltl_monitor.h
@@ -167,8 +167,10 @@ static void ltl_atom_update(struct task_struct *task, enum ltl_atom atom, bool v
 	ltl_atom_set(mon, atom, value);
 	ltl_atoms_fetch(task, mon);
 
-	if (!rv_ltl_valid_state(mon))
+	if (!rv_ltl_valid_state(mon)) {
 		ltl_attempt_start(task, mon);
+		return;
+	}
 
 	ltl_validate(task, mon);
 }
-- 
2.47.2