[PATCH 1/2] bitops.h: Improve sign_extend32()'s documentation

[Martin Kepplinger <martink@posteo.de>]

It is often overlooked that sign_extend32(), despite it's name, is safe
to use for 16 and 8 bit types aswell. This should help that sign extension
isn't done manually some other way.

Signed-off-by: Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
---
 include/linux/bitops.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index e635533..2177c01 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -164,6 +164,8 @@ static inline __u8 ror8(__u8 word, unsigned int shift)
  * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
  * @value: value to sign extend
  * @index: 0 based bit index (0<=index<32) to sign bit
+ *
+ * This is safe to use for 16- and 8-bit types aswell.
  */
 static inline __s32 sign_extend32(__u32 value, int index)
 {
-- 
2.1.4