--- 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