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

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Date:	Mon, 11 Jun 2012 15:59:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	arnd@...db.de, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] include: Fix compile warning in include/linux/bitops.h

On Fri,  8 Jun 2012 23:15:30 -0400
Namjae Jeon <linkinjeon@...il.com> wrote:

> 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.

um, what warning?

Please always quote the compiler messages when fixing build warnings or
errors.

> 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))) +	\

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