ftrace: add trace_special()
for ad-hoc tracing.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 27fa2d0..7bdfef3 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -26,6 +26,15 @@
};
/*
+ * Special (free-form) trace entry:
+ */
+struct special_entry {
+ unsigned long arg1;
+ unsigned long arg2;
+ unsigned long arg3;
+};
+
+/*
* The trace entry - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as:
*
@@ -41,6 +50,7 @@
union {
struct ftrace_entry fn;
struct ctx_switch_entry ctx;
+ struct special_entry special;
};
};
@@ -154,6 +164,11 @@
struct task_struct *next,
unsigned long flags);
void tracing_record_cmdline(struct task_struct *tsk);
+void trace_special(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3);
void tracing_start_function_trace(void);
void tracing_stop_function_trace(void);