1 files changed, 19 insertions, 32 deletions

diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 04508158815c..9714fbd7c42d 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -40,6 +40,8 @@
 
 #include <linux/timex.h>
 
+int time_keeper_id __read_mostly;	/* CPU used for timekeeping. */
+
 static unsigned long clocktick __ro_after_init;	/* timer cycles per tick */
 
 /*
@@ -70,8 +72,6 @@ irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
 	/* gcc can optimize for "read-only" case with a local clocktick */
 	unsigned long cpt = clocktick;
 
-	profile_tick(CPU_PROFILING);
-
 	/* Initialize next_tick to the old expected tick time. */
 	next_tick = cpuinfo->it_value;
 
@@ -86,10 +86,9 @@ irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
 	cpuinfo->it_value = next_tick;
 
 	/* Go do system house keeping. */
-	if (cpu == 0)
-		xtime_update(ticks_elapsed);
-
-	update_process_times(user_mode(get_irq_regs()));
+	if (IS_ENABLED(CONFIG_SMP) && (cpu != time_keeper_id))
+		ticks_elapsed = 0;
+	legacy_timer_tick(ticks_elapsed);
 
 	/* Skip clockticks on purpose if we know we would miss those.
 	 * The new CR16 must be "later" than current CR16 otherwise
@@ -153,7 +152,7 @@ static struct clocksource clocksource_cr16 = {
 	.flags			= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-void __init start_cpu_itimer(void)
+void start_cpu_itimer(void)
 {
 	unsigned int cpu = smp_processor_id();
 	unsigned long next_tick = mfctl(16) + clocktick;
@@ -180,9 +179,16 @@ static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
 static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
 {
 	time64_t secs = rtc_tm_to_time64(tm);
-
-	if (pdc_tod_set(secs, 0) < 0)
+	int ret;
+
+	/* hppa has Y2K38 problem: pdc_tod_set() takes an u32 value! */
+	ret = pdc_tod_set(secs, 0);
+	if (ret != 0) {
+		pr_warn("pdc_tod_set(%lld) returned error %d\n", secs, ret);
+		if (ret == PDC_INVALID_ARG)
+			return -EINVAL;
 		return -EOPNOTSUPP;
+	}
 
 	return 0;
 }
@@ -245,33 +251,14 @@ void __init time_init(void)
 static int __init init_cr16_clocksource(void)
 {
 	/*
-	 * The cr16 interval timers are not syncronized across CPUs on
-	 * different sockets, so mark them unstable and lower rating on
-	 * multi-socket SMP systems.
+	 * The cr16 interval timers are not synchronized across CPUs.
 	 */
 	if (num_online_cpus() > 1 && !running_on_qemu) {
-		int cpu;
-		unsigned long cpu0_loc;
-		cpu0_loc = per_cpu(cpu_data, 0).cpu_loc;
-
-		for_each_online_cpu(cpu) {
-			if (cpu == 0)
-				continue;
-			if ((cpu0_loc != 0) &&
-			    (cpu0_loc == per_cpu(cpu_data, cpu).cpu_loc))
-				continue;
-
-			clocksource_cr16.name = "cr16_unstable";
-			clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
-			clocksource_cr16.rating = 0;
-			break;
-		}
+		clocksource_cr16.name = "cr16_unstable";
+		clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
+		clocksource_cr16.rating = 0;
 	}
 
-	/* XXX: We may want to mark sched_clock stable here if cr16 clocks are
-	 *	in sync:
-	 *	(clocksource_cr16.flags == CLOCK_SOURCE_IS_CONTINUOUS) */
-
 	/* register at clocksource framework */
 	clocksource_register_hz(&clocksource_cr16,
 		100 * PAGE0->mem_10msec);