1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
index 7002de360d23..f0dc025077d5 100644
--- a/arch/arm/common/bL_switcher.c
+++ b/arch/arm/common/bL_switcher.c
@@ -27,6 +27,7 @@
 #include <linux/notifier.h>
 #include <linux/mm.h>
 #include <linux/mutex.h>
+#include <linux/smp.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/sysfs.h>
@@ -531,6 +532,25 @@ static int bL_switcher_halve_cpus(void)
         return 0;
 }
 
+static void bL_switcher_trace_trigger_cpu(void *__always_unused info)
+{
+        trace_cpu_migrate_current(get_ns(), read_mpidr());
+}
+
+static int bL_switcher_trace_trigger(void)
+{
+        int ret;
+
+        preempt_disable();
+
+        bL_switcher_trace_trigger_cpu(NULL);
+        ret = smp_call_function(bL_switcher_trace_trigger_cpu, NULL, true);
+
+        preempt_enable();
+
+        return ret;
+}
+
 static int bL_switcher_enable(void)
 {
         int cpu, ret;
@@ -553,6 +573,8 @@ static int bL_switcher_enable(void)
         if (ret)
                 goto error;
 
+        bL_switcher_trace_trigger();
+
         for_each_online_cpu(cpu) {
                 struct bL_thread *t = &bL_threads[cpu];
                 spin_lock_init(&t->lock);
@@ -637,6 +659,8 @@ static void bL_switcher_disable(void)
         }
 
         bL_switcher_restore_cpus();
+        bL_switcher_trace_trigger();
+
         bL_activation_notify(BL_NOTIFY_POST_DISABLE);
 
 out:
@@ -670,11 +694,23 @@ static ssize_t bL_switcher_active_store(struct kobject *kobj,
         return (ret >= 0) ? count : ret;
 }
 
+static ssize_t bL_switcher_trace_trigger_store(struct kobject *kobj,
+                struct kobj_attribute *attr, const char *buf, size_t count)
+{
+        int ret = bL_switcher_trace_trigger();
+
+        return ret ? ret : count;
+}
+
 static struct kobj_attribute bL_switcher_active_attr =
         __ATTR(active, 0644, bL_switcher_active_show, bL_switcher_active_store);
 
+static struct kobj_attribute bL_switcher_trace_trigger_attr =
+        __ATTR(trace_trigger, 0200, NULL, bL_switcher_trace_trigger_store);
+
 static struct attribute *bL_switcher_attrs[] = {
         &bL_switcher_active_attr.attr,
+        &bL_switcher_trace_trigger_attr.attr,
         NULL,
 };