diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 9e95bcebaf9b17cf70b39fe1d1dfd4bd762129d7..574e03fc7ba256d74e074c4762ced1f77d3cc0b1 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -244,6 +244,8 @@ extern void um_early_printk(const char *s, unsigned int n);
 extern void os_fix_helper_signals(void);
 extern void os_info(const char *fmt, ...)
 	__attribute__ ((format (printf, 1, 2)));
+extern void os_warn(const char *fmt, ...)
+	__attribute__ ((format (printf, 1, 2)));
 
 /* time.c */
 extern void os_idle_sleep(unsigned long long nsecs);
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index c9bad1bca108743100a0878515253b9542751697..8cc8b2617a670cc3f6ba475c07c21e62f2f37bd4 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -177,3 +177,12 @@ void os_info(const char *fmt, ...)
 	vfprintf(stderr, fmt, list);
 	va_end(list);
 }
+
+void os_warn(const char *fmt, ...)
+{
+	va_list list;
+
+	va_start(list, fmt);
+	vfprintf(stderr, fmt, list);
+	va_end(list);
+}