--- include/linux/ctype.h
+++ include/linux/ctype.h
@@ -52,4 +52,13 @@ static inline unsigned char __toupper(un
#define tolower(c) __tolower(c)
#define toupper(c) __toupper(c)
+/*
+ * Fast implementation of tolower() for internal usage. Do not use in your
+ * code.
+ */
+static inline char _tolower(const char c)
+{
+ return c | 0x20;
+}
+
#endif