rk3568 rt init

hc

2023-11-06 e3e12f52b214121840b44c91de5b3e5af5d3eb84

 kernel/kernel/time/tick-sched.c
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@@ -69,7 +69,8 @@
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 		return;
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 	/* Reevaluate with jiffies_lock held */
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-	write_seqlock(&jiffies_lock);
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+	raw_spin_lock(&jiffies_lock);
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+	write_seqcount_begin(&jiffies_seq);
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 	delta = ktime_sub(now, last_jiffies_update);
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 	if (delta >= tick_period) {
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@@ -95,10 +96,12 @@
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 		/* Keep the tick_next_period variable up to date */
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 		tick_next_period = ktime_add(last_jiffies_update, tick_period);
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 	} else {
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-		write_sequnlock(&jiffies_lock);
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+		write_seqcount_end(&jiffies_seq);
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+		raw_spin_unlock(&jiffies_lock);
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 		return;
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 	}
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-	write_sequnlock(&jiffies_lock);
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+	write_seqcount_end(&jiffies_seq);
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+	raw_spin_unlock(&jiffies_lock);
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 	update_wall_time();
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 }
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..
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@@ -109,12 +112,14 @@
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 {
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 	ktime_t period;
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-	write_seqlock(&jiffies_lock);
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+	raw_spin_lock(&jiffies_lock);
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+	write_seqcount_begin(&jiffies_seq);
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 	/* Did we start the jiffies update yet ? */
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 	if (last_jiffies_update == 0)
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 		last_jiffies_update = tick_next_period;
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 	period = last_jiffies_update;
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-	write_sequnlock(&jiffies_lock);
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+	write_seqcount_end(&jiffies_seq);
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+	raw_spin_unlock(&jiffies_lock);
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 	return period;
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 }
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..
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@@ -232,6 +237,7 @@
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 static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
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 	.func = nohz_full_kick_func,
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+	.flags = IRQ_WORK_HARD_IRQ,
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 };
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 /*
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@@ -657,10 +663,10 @@
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 	/* Read jiffies and the time when jiffies were updated last */
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 	do {
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-		seq = read_seqbegin(&jiffies_lock);
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+		seq = read_seqcount_begin(&jiffies_seq);
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 		basemono = last_jiffies_update;
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 		basejiff = jiffies;
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-	} while (read_seqretry(&jiffies_lock, seq));
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+	} while (read_seqcount_retry(&jiffies_seq, seq));
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 	ts->last_jiffies = basejiff;
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 	ts->timer_expires_base = basemono;
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@@ -891,14 +897,7 @@
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 		return false;
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 	if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
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-		static int ratelimit;
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-
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-		if (ratelimit < 10 &&
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-		    (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
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-			pr_warn("NOHZ: local_softirq_pending %02x\n",
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-				(unsigned int) local_softirq_pending());
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-			ratelimit++;
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-		}
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+		softirq_check_pending_idle();
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 		return false;
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 	}
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..
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@@ -1330,7 +1329,7 @@
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 	/*
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 	 * Emulate tick processing via per-CPU hrtimers:
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 	 */
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-	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
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+	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
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 	ts->sched_timer.function = tick_sched_timer;
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 	/* Get the next period (per-CPU) */