irq/tracing: Export enums in tracepoints to user space

The enums used by the softirq mapping is what is shown in the output
of the __print_symbolic() and not their values, that are needed
to map them to their strings. Export them to userspace with the
TRACE_DEFINE_ENUM() macro so that user space tools can map the enums
with their values.

Link: http://lkml.kernel.org/r/20150403013802.220157513@goodmis.org

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/trace/events/irq.h

@@ -9,19 +9,34 @@
 struct irqaction;
 struct softirq_action;
 
-#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
+#define SOFTIRQ_NAME_LIST				\
+			 softirq_name(HI)		\
+			 softirq_name(TIMER)		\
+			 softirq_name(NET_TX)		\
+			 softirq_name(NET_RX)		\
+			 softirq_name(BLOCK)		\
+			 softirq_name(BLOCK_IOPOLL)	\
+			 softirq_name(TASKLET)		\
+			 softirq_name(SCHED)		\
+			 softirq_name(HRTIMER)		\
+			 softirq_name_end(RCU)
+
+#undef softirq_name
+#undef softirq_name_end
+
+#define softirq_name(sirq) TRACE_DEFINE_ENUM(sirq##_SOFTIRQ);
+#define softirq_name_end(sirq)  TRACE_DEFINE_ENUM(sirq##_SOFTIRQ);
+
+SOFTIRQ_NAME_LIST
+
+#undef softirq_name
+#undef softirq_name_end
+
+#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq },
+#define softirq_name_end(sirq) { sirq##_SOFTIRQ, #sirq }
+
 #define show_softirq_name(val)				\
-	__print_symbolic(val,				\
-			 softirq_name(HI),		\
-			 softirq_name(TIMER),		\
-			 softirq_name(NET_TX),		\
-			 softirq_name(NET_RX),		\
-			 softirq_name(BLOCK),		\
-			 softirq_name(BLOCK_IOPOLL),	\
-			 softirq_name(TASKLET),		\
-			 softirq_name(SCHED),		\
-			 softirq_name(HRTIMER),		\
-			 softirq_name(RCU))
+	__print_symbolic(val, SOFTIRQ_NAME_LIST)
 
 /**
  * irq_handler_entry - called immediately before the irq action handler