[RFC PATCH v2 2/5] napi: convert trace_napi_poll to TRACE_EVENT

[Koki Sanagi <sanagi.koki@jp.fujitsu.com>]

This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT.
This lets you know how long napi_poll takes.

          <idle>-0     [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
          <idle>-0     [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1
          <idle>-0     [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d20c for device eth1

This is a same patch Neil Horman submitted.
http://marc.info/?l=linux-kernel&m=125978157926853&w=2

Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
---
 include/trace/events/napi.h |   23 +++++++++++++++++++++--
 1 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
index 188deca..512a057 100644
--- a/include/trace/events/napi.h
+++ b/include/trace/events/napi.h
@@ -6,10 +6,29 @@
 
 #include <linux/netdevice.h>
 #include <linux/tracepoint.h>
+#include <linux/ftrace.h>
+
+#define NO_DEV "(no_device)"
+
+TRACE_EVENT(napi_poll,
 
-DECLARE_TRACE(napi_poll,
 	TP_PROTO(struct napi_struct *napi),
-	TP_ARGS(napi));
+
+	TP_ARGS(napi),
+
+	TP_STRUCT__entry(
+		__field(	struct napi_struct *,	napi)
+		__string(	dev_name, napi->dev ? napi->dev->name : NO_DEV)
+	),
+
+	TP_fast_assign(
+		__entry->napi = napi;
+		__assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);
+	),
+
+	TP_printk("napi poll on napi struct %p for device %s",
+		__entry->napi, __get_str(dev_name))
+);
 
 #endif /* _TRACE_NAPI_H_ */