[PATCH v2] can: build proc support only if CONFIG_PROC_FS is activated

[Marc Kleine-Budde <mkl@pengutronix.de>]

From: Alexander Aring <aar@pengutronix.de>

When building can subsystem with CONFIG_PROC_FS=n I detected some unused
variables warning by using proc functions. In CAN the proc handling is
nicely placed in one object file. This patch adds simple add a
dependency on CONFIG_PROC_FS for CAN's proc.o file and corresponding
static inline no-op functions.

Signed-off-by: Alexander Aring <aar@pengutronix.de>
[mkl: provide static inline noops instead of using #ifdefs]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
Hello,

picking up Alex's work. I've switched from #ifdef's to no-ops.

regards,
Marc

 net/can/Makefile |  3 ++-
 net/can/af_can.h | 11 +++++++++++
 net/can/proc.c   |  3 +--
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/net/can/Makefile b/net/can/Makefile
index cef49eb1f5c7..10936754e3f2 100644
--- a/net/can/Makefile
+++ b/net/can/Makefile
@@ -3,7 +3,8 @@
 #
 
 obj-$(CONFIG_CAN)	+= can.o
-can-y			:= af_can.o proc.o
+can-y			:= af_can.o
+can-$(CONFIG_PROC_FS)	+= proc.o
 
 obj-$(CONFIG_CAN_RAW)	+= can-raw.o
 can-raw-y		:= raw.o
diff --git a/net/can/af_can.h b/net/can/af_can.h
index fca0fe9fc45a..38a79ff20022 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -113,8 +113,19 @@ struct s_pstats {
 extern struct dev_rcv_lists can_rx_alldev_list;
 
 /* function prototypes for the CAN networklayer procfs (proc.c) */
+#ifdef CONFIG_PROC_FS
 void can_init_proc(void);
 void can_remove_proc(void);
+#else
+static inline void can_init_proc(void)
+{
+	pr_info("can: Can't create /proc/net/can. CONFIG_PROC_FS missing!\n");
+}
+
+static inline void can_remove_proc(void)
+{
+}
+#endif
 void can_stat_update(unsigned long data);
 
 /* structures and variables from af_can.c needed in proc.c for reading */
diff --git a/net/can/proc.c b/net/can/proc.c
index 1a19b985a868..85ef7bb0f176 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -517,8 +517,7 @@ void can_init_proc(void)
 	can_dir = proc_mkdir("can", init_net.proc_net);
 
 	if (!can_dir) {
-		printk(KERN_INFO "can: failed to create /proc/net/can . "
-		       "CONFIG_PROC_FS missing?\n");
+		pr_info("can: failed to create /proc/net/can.\n");
 		return;
 	}
 
-- 
2.8.1