netdev - [PATCH 4/9] l2tp: add tracepoint infrastructure to core

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Date:   Fri, 21 Aug 2020 11:47:23 +0100
From:   Tom Parkin <tparkin@...alix.com>
To:     netdev@...r.kernel.org
Cc:     jchapman@...alix.com, Tom Parkin <tparkin@...alix.com>
Subject: [PATCH 4/9] l2tp: add tracepoint infrastructure to core

The l2tp subsystem doesn't currently make use of tracepoints.

As a starting point for adding tracepoints, add skeleton infrastructure
for defining tracepoints for the subsystem, and for having them build
appropriately whether compiled into the kernel or built as a module.

Signed-off-by: Tom Parkin <tparkin@...alix.com>
---
 net/l2tp/Makefile    |  2 ++
 net/l2tp/l2tp_core.c |  3 +++
 net/l2tp/trace.h     | 15 +++++++++++++++
 3 files changed, 20 insertions(+)
 create mode 100644 net/l2tp/trace.h

diff --git a/net/l2tp/Makefile b/net/l2tp/Makefile
index 399a7e5db2f4..cf8f27071d3f 100644
--- a/net/l2tp/Makefile
+++ b/net/l2tp/Makefile
@@ -5,6 +5,8 @@
 
 obj-$(CONFIG_L2TP) += l2tp_core.o
 
+CFLAGS_l2tp_core.o += -I$(src)
+
 # Build l2tp as modules if L2TP is M
 obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_PPPOL2TP)) += l2tp_ppp.o
 obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip.o
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index a0f982add6ad..a9825724e2f4 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -62,6 +62,9 @@
 
 #include "l2tp_core.h"
 
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
 #define L2TP_DRV_VERSION	"V2.0"
 
 /* L2TP header constants */
diff --git a/net/l2tp/trace.h b/net/l2tp/trace.h
new file mode 100644
index 000000000000..652778291b77
--- /dev/null
+++ b/net/l2tp/trace.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM l2tp
+
+#if !defined(_TRACE_L2TP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_L2TP_H
+
+#endif /* _TRACE_L2TP_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+#include <trace/define_trace.h>
-- 
2.17.1