Index: sys/compat/linuxkpi/common/include/linux/printk.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/printk.h
+++ sys/compat/linuxkpi/common/include/linux/printk.h
@@ -127,4 +127,7 @@
 #define	pr_info_ratelimited(fmt, ...) \
 	printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 
+#define pr_err_once(fmt, ...)					\
+	printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
+
 #endif					/* _LINUX_PRINTK_H_ */