[PATCH 12/18] Add dev_WARN_ONCE()

[Sascha Hauer]

dev_WARN_ONCE() is like WARN_ONCE(), but with a struct device *argument
to print device context.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 include/linux/printk.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index a9d1b05f6f..42c29e04dd 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -205,4 +205,17 @@ static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len)	\
 	print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
 
+#define dev_WARN_ONCE(dev, condition, format...) ({      \
+        static int __warned;			\
+        int __ret_warn_once = !!(condition);	\
+						\
+        if (unlikely(__ret_warn_once)) {	\
+                if (!__warned) { 		\
+                        __warned = 1;		\
+                        dev_warn(dev, format);	\
+                }				\
+        }					\
+        unlikely(__ret_warn_once);		\
+})
+
 #endif
-- 
2.30.2