linux-kernel - [PATCH 03/12] timer: Protect lockdep functions with #ifdef

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Date:   Tue,  8 Feb 2022 11:43:15 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Byungchul Park <byungchul.park@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Radoslaw Burny <rburny@...gle.com>
Subject: [PATCH 03/12] timer: Protect lockdep functions with #ifdef

With upcoming lock tracepoints config, it'd define some of lockdep
functions without enabling CONFIG_LOCKDEP actually.  The existing code
assumes those functions will be removed by the preprocessor but it's
not the case anymore.  Let's protect the code with #ifdef's explicitly.

Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/time/timer.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 85f1021ad459..4af95dbf6435 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -794,7 +794,10 @@ static void do_init_timer(struct timer_list *timer,
 	if (WARN_ON_ONCE(flags & ~TIMER_INIT_FLAGS))
 		flags &= TIMER_INIT_FLAGS;
 	timer->flags = flags | raw_smp_processor_id();
+
+#ifdef CONFIG_LOCKDEP
 	lockdep_init_map(&timer->lockdep_map, name, key, 0);
+#endif
 }
 
 /**
@@ -1409,19 +1412,22 @@ static void call_timer_fn(struct timer_list *timer,
 	struct lockdep_map lockdep_map;
 
 	lockdep_copy_map(&lockdep_map, &timer->lockdep_map);
-#endif
+
 	/*
 	 * Couple the lock chain with the lock chain at
 	 * del_timer_sync() by acquiring the lock_map around the fn()
 	 * call here and in del_timer_sync().
 	 */
 	lock_map_acquire(&lockdep_map);
+#endif
 
 	trace_timer_expire_entry(timer, baseclk);
 	fn(timer);
 	trace_timer_expire_exit(timer);
 
+#ifdef CONFIG_LOCKDEP
 	lock_map_release(&lockdep_map);
+#endif
 
 	if (count != preempt_count()) {
 		WARN_ONCE(1, "timer: %pS preempt leak: %08x -> %08x\n",
-- 
2.35.0.263.gb82422642f-goog