hwtracing: hisi_ptt: Add dummy callback pmu::read()

[platform/kernel/linux-starfive.git] / drivers / hwtracing / ptt / hisi_ptt.c

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index 4140efd..016220b 100644 (file)
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -837,6 +837,10 @@ static void hisi_ptt_pmu_del(struct perf_event *event, int flags)
        hisi_ptt_pmu_stop(event, PERF_EF_UPDATE);
 }
 
+static void hisi_ptt_pmu_read(struct perf_event *event)
+{
+}
+
 static void hisi_ptt_remove_cpuhp_instance(void *hotplug_node)
 {
        cpuhp_state_remove_instance_nocalls(hisi_ptt_pmu_online, hotplug_node);
@@ -880,6 +884,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
                .stop           = hisi_ptt_pmu_stop,
                .add            = hisi_ptt_pmu_add,
                .del            = hisi_ptt_pmu_del,
+               .read           = hisi_ptt_pmu_read,
        };
 
        reg = readl(hisi_ptt->iobase + HISI_PTT_LOCATION);