powerpc: Replace deprecated CPU-hotplug functions.

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210803141621.780504-4-bigeasy@linutronix.de

arch/powerpc/kernel/rtasd.c

@@ -429,7 +429,7 @@ static void rtas_event_scan(struct work_struct *w)
 
 	do_event_scan();
 
-	get_online_cpus();
+	cpus_read_lock();
 
 	/* raw_ OK because just using CPU as starting point. */
 	cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
@@ -451,7 +451,7 @@ static void rtas_event_scan(struct work_struct *w)
 	schedule_delayed_work_on(cpu, &event_scan_work,
 		__round_jiffies_relative(event_scan_delay, cpu));
 
-	put_online_cpus();
+	cpus_read_unlock();
 }
 
 #ifdef CONFIG_PPC64

arch/powerpc/kvm/book3s_hv_builtin.c

@@ -137,23 +137,23 @@ long int kvmppc_rm_h_confer(struct kvm_vcpu *vcpu, int target,
  * exist in the system. We use a counter of VMs to track this.
  *
  * One of the operations we need to block is onlining of secondaries, so we
- * protect hv_vm_count with get/put_online_cpus().
+ * protect hv_vm_count with cpus_read_lock/unlock().
  */
 static atomic_t hv_vm_count;
 
 void kvm_hv_vm_activated(void)
 {
-	get_online_cpus();
+	cpus_read_lock();
 	atomic_inc(&hv_vm_count);
-	put_online_cpus();
+	cpus_read_unlock();
 }
 EXPORT_SYMBOL_GPL(kvm_hv_vm_activated);
 
 void kvm_hv_vm_deactivated(void)
 {
-	get_online_cpus();
+	cpus_read_lock();
 	atomic_dec(&hv_vm_count);
-	put_online_cpus();
+	cpus_read_unlock();
 }
 EXPORT_SYMBOL_GPL(kvm_hv_vm_deactivated);
 

arch/powerpc/platforms/powernv/idle.c

@@ -199,12 +199,12 @@ static ssize_t store_fastsleep_workaround_applyonce(struct device *dev,
 	 */
 	power7_fastsleep_workaround_exit = false;
 
-	get_online_cpus();
+	cpus_read_lock();
 	primary_thread_mask = cpu_online_cores_map();
 	on_each_cpu_mask(&primary_thread_mask,
 				pnv_fastsleep_workaround_apply,
 				&err, 1);
-	put_online_cpus();
+	cpus_read_unlock();
 	if (err) {
 		pr_err("fastsleep_workaround_applyonce change failed while running pnv_fastsleep_workaround_apply");
 		goto fail;

arch/powerpc/platforms/powernv/opal-imc.c

@@ -186,7 +186,7 @@ static void disable_nest_pmu_counters(void)
 	int nid, cpu;
 	const struct cpumask *l_cpumask;
 
-	get_online_cpus();
+	cpus_read_lock();
 	for_each_node_with_cpus(nid) {
 		l_cpumask = cpumask_of_node(nid);
 		cpu = cpumask_first_and(l_cpumask, cpu_online_mask);
@@ -195,7 +195,7 @@ static void disable_nest_pmu_counters(void)
 		opal_imc_counters_stop(OPAL_IMC_COUNTERS_NEST,
 				       get_hard_smp_processor_id(cpu));
 	}
-	put_online_cpus();
+	cpus_read_unlock();
 }
 
 static void disable_core_pmu_counters(void)
@@ -203,7 +203,7 @@ static void disable_core_pmu_counters(void)
 	cpumask_t cores_map;
 	int cpu, rc;
 
-	get_online_cpus();
+	cpus_read_lock();
 	/* Disable the IMC Core functions */
 	cores_map = cpu_online_cores_map();
 	for_each_cpu(cpu, &cores_map) {
@@ -213,7 +213,7 @@ static void disable_core_pmu_counters(void)
 			pr_err("%s: Failed to stop Core (cpu = %d)\n",
 				__FUNCTION__, cpu);
 	}
-	put_online_cpus();
+	cpus_read_unlock();
 }
 
 int get_max_nest_dev(void)