linux-kernel - [PATCH 1/2] bitops.h: improve documentation for sign

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Message-Id: <1421757055-8234-2-git-send-email-martink@posteo.de>
Date:	Tue, 20 Jan 2015 13:30:54 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	torvalds@...ux-foundation.org, jsrhbz@...argh.force9.co.uk,
	christoph.muellner@...obroma-systems.com, linux@...ck-us.net,
	linux@...musvillemoes.dk, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de, mingo@...nel.org, akpm@...ux-foundation.org,
	hpa@...or.com, maxime.coquelin@...com,
	linux-kernel@...r.kernel.org, peterz@...radead.org, tytso@....edu
Cc:	linux-tip-commits@...r.kernel.org,
	Martin Kepplinger <martink@...teo.de>
Subject: [PATCH 1/2] bitops.h: improve documentation for sign_extend32()

Signed-off-by: Martin Kepplinger <martink@...teo.de>
---
 include/linux/bitops.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 5d858e0..336f22b 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
+ *
+ * Safe to use for sign extending to 8 and 16 bit data types aswell.
  */
 static inline __s32 sign_extend32(__u32 value, int index)
 {
-- 
2.1.4

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