linux-kernel - Re: [PATCH] Add the macro to test if "exactly_one_bit

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Message-ID: <4730AE66.6030501@panasas.com>
Date:	Tue, 06 Nov 2007 20:11:50 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, matthew@....cx
Subject: Re: [PATCH] Add the macro to test if "exactly_one_bit_set" to log2.h.

On Tue, Nov 06 2007 at 18:38 +0200, "Robert P. J. Day" <rpjday@...shcourse.ca> wrote:
> While this macro is defined in terms of "is_power_of_2" and is
> therefore functionally equivalent, the visual semantics are sometimes
> more appropriate for what is actually being tested.
> 
> Signed-off-by: Robert P. J. Day <rpjday@...shcourse.ca>
> 
> ---
> 
> diff --git a/include/linux/log2.h b/include/linux/log2.h
> index c8cf5e8..d0d324e 100644
> --- a/include/linux/log2.h
> +++ b/include/linux/log2.h
> @@ -55,6 +55,12 @@ bool is_power_of_2(unsigned long n)
>  }
> 
>  /*
> + *  And for folks who want slightly different semantics ...
> + */
> +
> +#define exactly_one_bit_set is_power_of_2

at_most_one_bit_set No?
> +
> +/*
>   * round up to nearest power of two
>   */
>  static inline __attribute__((const))

Boaz
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