[PATCH] dynamic_debug: provide dynamic_hex_dump stub

[Arnd Bergmann]

The ionic driver started using dymamic_hex_dump(), but
that is not always defined:

drivers/net/ethernet/pensando/ionic/ionic_main.c:229:2: error: implicit 
declaration of function 'dynamic_hex_dump' 
[-Werror,-Wimplicit-function-declaration]

Add a dummy implementation to use when CONFIG_DYNAMIC_DEBUG
is disabled, printing nothing.

Fixes: 938962d55229 ("ionic: Add adminq action")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c  | 2 ++
 drivers/net/ethernet/pensando/ionic/ionic_main.c | 2 ++
 include/linux/dynamic_debug.h                    | 6 ++++++
 3 files changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c 
b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index db7c82742828..a255d24c8e40 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
 
+#include <linux/printk.h>
+#include <linux/dynamic_debug.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/rtnetlink.h>
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c 
b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 15e432386b35..aab311413412 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
 
+#include <linux/printk.h>
+#include <linux/dynamic_debug.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/utsname.h>
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 6c809440f319..4cf02ecd67de 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -204,6 +204,12 @@ static inline int ddebug_dyndbg_module_param_cb(char 
*param, char *val,
        do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
 #define dynamic_dev_dbg(dev, fmt, ...)                                 \
        do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
+#define dynamic_hex_dump(prefix_str, prefix_type, rowsize,             \
+                        groupsize, buf, len, ascii)                    \
+       do { if (0)                                                     \
+               print_hex_dump(KERN_DEBUG, prefix_str, prefix_type,     \
+                               rowsize, groupsize, buf, len, ascii);   \
+       } while (0)
 #endif
 
 #endif
-- 
2.20.0