diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -161,6 +161,24 @@
 	return (__DECONST(char *, str));
 }
 
+/*
+ * This function trims whitespaces at the end of a string and returns a pointer
+ * to the first non-whitespace character.
+ */
+static inline char *
+strim(char *str)
+{
+	char *end;
+
+	end = str + strlen(str);
+	while (end >= str && (*end == '\0' || isspace(*end))) {
+		*end = '\0';
+		end--;
+	}
+
+	return (skip_spaces(str));
+}
+
 static inline void *
 memchr_inv(const void *start, int c, size_t length)
 {