ftrace: sched special

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 5a217e863586..bddf676914ed 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -103,6 +103,30 @@ ftrace_wake_up_task(void *__rq, struct task_struct *wakee,
         wakeup_sched_wakeup(wakee, curr);
 }
 
+void
+ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+        struct trace_array *tr = ctx_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+
+        if (!tracer_enabled)
+                return;
+
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1))
+                __trace_special(tr, data, arg1, arg2, arg3);
+
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+}
+
 static void sched_switch_reset(struct trace_array *tr)
 {
         int cpu;