From: Dan Williams <dan.j.williams@intel.com>

Duplicate what Zach Brown did for pr_debug in commit
8b2a1fd1b394c60eaa2587716102dd5e9b4e5990

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/device.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff -puN include/linux/device.h~dev_dbg-check-dev_dbg-arguments include/linux/device.h
--- a/include/linux/device.h~dev_dbg-check-dev_dbg-arguments
+++ a/include/linux/device.h
@@ -571,7 +571,11 @@ extern const char *dev_driver_string(str
 #define dev_dbg(dev, format, arg...)		\
 	dev_printk(KERN_DEBUG , dev , format , ## arg)
 #else
-#define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
+static inline int __attribute__ ((format (printf, 2, 3)))
+dev_dbg(struct device * dev, const char * fmt, ...)
+{
+	return 0;
+}
 #endif
 
 #define dev_err(dev, format, arg...)		\
_