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

Frederic Weisbecker
2024-02-25T22:55:22Z

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

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <frederic@kernel.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