tracing: 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.
Link: https://lkml.kernel.org/r/20210803141621.780504-37-bigeasy@linutronix.de
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 14f46aa..1b83d75 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -325,10 +325,10 @@ static void move_to_next_cpu(void)
if (!cpumask_equal(current_mask, current->cpus_ptr))
goto change_mode;
- get_online_cpus();
+ cpus_read_lock();
cpumask_and(current_mask, cpu_online_mask, tr->tracing_cpumask);
next_cpu = cpumask_next(raw_smp_processor_id(), current_mask);
- put_online_cpus();
+ cpus_read_unlock();
if (next_cpu >= nr_cpu_ids)
next_cpu = cpumask_first(current_mask);
@@ -398,7 +398,7 @@ static void stop_single_kthread(void)
struct hwlat_kthread_data *kdata = get_cpu_data();
struct task_struct *kthread;
- get_online_cpus();
+ cpus_read_lock();
kthread = kdata->kthread;
if (!kthread)
@@ -408,7 +408,7 @@ static void stop_single_kthread(void)
kdata->kthread = NULL;
out_put_cpus:
- put_online_cpus();
+ cpus_read_unlock();
}
@@ -425,14 +425,14 @@ static int start_single_kthread(struct trace_array *tr)
struct task_struct *kthread;
int next_cpu;
- get_online_cpus();
+ cpus_read_lock();
if (kdata->kthread)
goto out_put_cpus;
kthread = kthread_create(kthread_fn, NULL, "hwlatd");
if (IS_ERR(kthread)) {
pr_err(BANNER "could not start sampling thread\n");
- put_online_cpus();
+ cpus_read_unlock();
return -ENOMEM;
}
@@ -452,7 +452,7 @@ static int start_single_kthread(struct trace_array *tr)
wake_up_process(kthread);
out_put_cpus:
- put_online_cpus();
+ cpus_read_unlock();
return 0;
}
@@ -479,10 +479,10 @@ static void stop_per_cpu_kthreads(void)
{
unsigned int cpu;
- get_online_cpus();
+ cpus_read_lock();
for_each_online_cpu(cpu)
stop_cpu_kthread(cpu);
- put_online_cpus();
+ cpus_read_unlock();
}
/*
@@ -515,7 +515,7 @@ static void hwlat_hotplug_workfn(struct work_struct *dummy)
mutex_lock(&trace_types_lock);
mutex_lock(&hwlat_data.lock);
- get_online_cpus();
+ cpus_read_lock();
if (!hwlat_busy || hwlat_data.thread_mode != MODE_PER_CPU)
goto out_unlock;
@@ -526,7 +526,7 @@ static void hwlat_hotplug_workfn(struct work_struct *dummy)
start_cpu_kthread(cpu);
out_unlock:
- put_online_cpus();
+ cpus_read_unlock();
mutex_unlock(&hwlat_data.lock);
mutex_unlock(&trace_types_lock);
}
@@ -582,7 +582,7 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
unsigned int cpu;
int retval;
- get_online_cpus();
+ cpus_read_lock();
/*
* Run only on CPUs in which hwlat is allowed to run.
*/
@@ -596,12 +596,12 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
if (retval)
goto out_error;
}
- put_online_cpus();
+ cpus_read_unlock();
return 0;
out_error:
- put_online_cpus();
+ cpus_read_unlock();
stop_per_cpu_kthreads();
return retval;
}