lib: make _tolower() public

This function is required by *printf and kstrto* functions that are
located in the different modules.  This patch makes _tolower() public.
However, it's good idea to not use the helper outside of mentioned
functions.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/ctype.h b/include/linux/ctype.h
index a3d6ee0044f9..8acfe312f947 100644
--- a/include/linux/ctype.h
+++ b/include/linux/ctype.h
@@ -52,4 +52,13 @@ static inline unsigned char __toupper(unsigned char c)
 #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