linux-kernel - [PATCH] include: Fix compile warning in include/linux/bitops.h

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Message-Id: <1339211730-10398-1-git-send-email-linkinjeon@gmail.com>
Date:	Fri,  8 Jun 2012 23:15:30 -0400
From:	Namjae Jeon <linkinjeon@...il.com>
To:	arnd@...db.de, akpm@...ux-foundation.org
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <linkinjeon@...il.com>
Subject: [PATCH] include: Fix compile warning in include/linux/bitops.h

The compile 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 type casting to remove warning.

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

diff --git a/include/asm-generic/bitops/const_hweight.h b/include/asm-generic/bitops/const_hweight.h
index fa2a50b..3ad0dae 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))) +	\
-- 
1.7.9.5

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