linux-kernel - [PATCH 04/16] tick: Use IS_ENABLED() whenever possible

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Date: Sun, 25 Feb 2024 23:54:56 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Peng Liu <liupeng17@...ovo.com>,
	Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 04/16] tick: Use IS_ENABLED() whenever possible

Avoid ifdeferry if it can be converted to IS_ENABLED() whenever possible

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/time/tick-common.c |  4 +---
 kernel/time/tick-sched.c  | 14 +++++---------
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index e9138cd7a0f5..0084e1ae2583 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -111,15 +111,13 @@ void tick_handle_periodic(struct clock_event_device *dev)
 
 	tick_periodic(cpu);
 
-#if defined(CONFIG_HIGH_RES_TIMERS) || defined(CONFIG_NO_HZ_COMMON)
 	/*
 	 * The cpu might have transitioned to HIGHRES or NOHZ mode via
 	 * update_process_times() -> run_local_timers() ->
 	 * hrtimer_run_queues().
 	 */
-	if (dev->event_handler != tick_handle_periodic)
+	if (IS_ENABLED(CONFIG_TICK_ONESHOT) && dev->event_handler != tick_handle_periodic)
 		return;
-#endif
 
 	if (!clockevent_state_oneshot(dev))
 		return;
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 27aaecb2e50c..4e34967edc0d 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -186,7 +186,6 @@ static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
 {
 	int cpu = smp_processor_id();
 
-#ifdef CONFIG_NO_HZ_COMMON
 	/*
 	 * Check if the do_timer duty was dropped. We don't care about
 	 * concurrency: This happens only when the CPU in charge went
@@ -197,13 +196,13 @@ static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
 	 * If nohz_full is enabled, this should not happen because the
 	 * 'tick_do_timer_cpu' CPU never relinquishes.
 	 */
-	if (unlikely(tick_do_timer_cpu == TICK_DO_TIMER_NONE)) {
+	if (IS_ENABLED(CONFIG_NO_HZ_COMMON) &&
+	    unlikely(tick_do_timer_cpu == TICK_DO_TIMER_NONE)) {
 #ifdef CONFIG_NO_HZ_FULL
 		WARN_ON_ONCE(tick_nohz_full_running);
 #endif
 		tick_do_timer_cpu = cpu;
 	}
-#endif
 
 	/* Check if jiffies need an update */
 	if (tick_do_timer_cpu == cpu)
@@ -230,7 +229,6 @@ static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
 
 static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
 {
-#ifdef CONFIG_NO_HZ_COMMON
 	/*
 	 * When we are idle and the tick is stopped, we have to touch
 	 * the watchdog as we might not schedule for a really long
@@ -239,7 +237,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
 	 * idle" jiffy stamp so the idle accounting adjustment we do
 	 * when we go busy again does not account too many ticks.
 	 */
-	if (ts->tick_stopped) {
+	if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && ts->tick_stopped) {
 		touch_softlockup_watchdog_sched();
 		if (is_idle_task(current))
 			ts->idle_jiffies++;
@@ -250,7 +248,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
 		 */
 		ts->next_tick = 0;
 	}
-#endif
+
 	update_process_times(user_mode(regs));
 	profile_tick(CPU_PROFILING);
 }
@@ -1587,10 +1585,8 @@ void tick_cancel_sched_timer(int cpu)
 	ktime_t idle_sleeptime, iowait_sleeptime;
 	unsigned long idle_calls, idle_sleeps;
 
-# ifdef CONFIG_HIGH_RES_TIMERS
-	if (ts->sched_timer.base)
+	if (IS_ENABLED(CONFIG_HIGH_RES_TIMERS) && ts->sched_timer.base)
 		hrtimer_cancel(&ts->sched_timer);
-# endif
 
 	idle_sleeptime = ts->idle_sleeptime;
 	iowait_sleeptime = ts->iowait_sleeptime;
-- 
2.43.0