hwlat_detector-avoid-smp_processor_id.patch

Avoid smp_processor_id() in preemptible code.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 10 deletions

diff --git a/drivers/misc/hwlat_detector.c b/drivers/misc/hwlat_detector.c
index d9549e9b58f4..953783c983dd 100644
--- a/drivers/misc/hwlat_detector.c
+++ b/drivers/misc/hwlat_detector.c
@@ -191,17 +191,11 @@ static struct sample *buffer_get_sample(struct sample *sample)
         if (!sample)
                 return NULL;
 
-        /* ring_buffers are per-cpu but we just want any value */
-        /* so we'll start with this cpu and try others if not */
-        /* Steven is planning to add a generic mechanism */
         mutex_lock(&ring_buffer_mutex);
-        e = ring_buffer_consume(ring_buffer, smp_processor_id(), NULL);
-        if (!e) {
-                for_each_online_cpu(cpu) {
-                        e = ring_buffer_consume(ring_buffer, cpu, NULL);
-                        if (e)
-                                break;
-                }
+        for_each_online_cpu(cpu) {
+                e = ring_buffer_consume(ring_buffer, cpu, NULL);
+                if (e)
+                        break;
         }
 
         if (e) {