linux-kernel - [PATCH] include : compile warning by __const

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Message-Id: <1309693345-2213-1-git-send-email-linkinjeon@gmail.com>
Date:	Sun,  3 Jul 2011 20:42:25 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	arnd@...db.de
Cc:	linux-kernel@...r.kernel.org, linkinjeon@...il.com
Subject: [PATCH] include : compile warning by __const_hweight8

The compilation warning is caused by __const_hweight8 when using hweight_long with -Wsign-compare option.
The reason is that the default return value of this macro is signed. So, need tye casting to remove warning.

Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
---
 include/asm-generic/bitops/const_hweight.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/asm-generic/bitops/const_hweight.h b/include/asm-generic/bitops/const_hweight.h
index fa2a50b..d91b1aa 100644
--- a/include/asm-generic/bitops/const_hweight.h
+++ b/include/asm-generic/bitops/const_hweight.h
@@ -4,7 +4,7 @@
 /*
  * Compile time versions of __arch_hweightN()
  */
-#define __const_hweight8(w)		\
+#define __const_hweight8(w) (unsigned long)	\
       (	(!!((w) & (1ULL << 0))) +	\
 	(!!((w) & (1ULL << 1))) +	\
 	(!!((w) & (1ULL << 2))) +	\
-- 
1.7.4.4

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