Ksawlii/kernel_samsung_a53x
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Reapply "timekeeping: Keep the tick alive when CPUs cycle out of s2idle"

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This reverts commit 0a04e29636.
This commit is contained in:
Ksawlii 2024-12-18 11:24:12 +01:00
parent 0a8f9b7b96
commit 12ce49e196
1 changed files with 14 additions and 5 deletions
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19
kernel/time/tick-common.c
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@ -497,7 +497,7 @@ void tick_resume(void)
#ifdef CONFIG_SUSPEND
static DEFINE_RAW_SPINLOCK(tick_freeze_lock);
static unsigned int tick_freeze_depth;
static unsigned long tick_frozen_mask;
/**
* tick_freeze - Suspend the local tick and (possibly) timekeeping.
@ -510,10 +510,17 @@ static unsigned int tick_freeze_depth;
*/
void tick_freeze(void)
{
int cpu = smp_processor_id();
raw_spin_lock(&tick_freeze_lock);
tick_freeze_depth++;
if (tick_freeze_depth == num_online_cpus()) {
tick_frozen_mask |= BIT(cpu);
if (tick_do_timer_cpu == cpu) {
cpu = ffz(tick_frozen_mask);
tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
TICK_DO_TIMER_NONE;
}
if (tick_frozen_mask == *cpumask_bits(cpu_online_mask)) {
trace_suspend_resume(TPS("timekeeping_freeze"),
smp_processor_id(), true);
system_state = SYSTEM_SUSPEND;
@ -537,9 +544,11 @@ void tick_freeze(void)
*/
void tick_unfreeze(void)
{
int cpu = smp_processor_id();
raw_spin_lock(&tick_freeze_lock);
if (tick_freeze_depth == num_online_cpus()) {
if (tick_frozen_mask == *cpumask_bits(cpu_online_mask)) {
timekeeping_resume();
sched_clock_resume();
system_state = SYSTEM_RUNNING;
@ -550,7 +559,7 @@ void tick_unfreeze(void)
tick_resume_local();
}
tick_freeze_depth--;
tick_frozen_mask &= ~BIT(cpu);
raw_spin_unlock(&tick_freeze_lock);
}