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

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Date:	Thu, 8 Nov 2007 20:36:40 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
Cc:	linux-kernel@...r.kernel.org, matthew@....cx
Subject: Re: [PATCH] Add the macro to test if "exactly_one_bit_set" to
 log2.h.

> On Tue, 6 Nov 2007 11:38:52 -0500 (EST) "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.
> 

This is gettig a bit anal, but I guess you're the is_power_of_2 maintainer.

> ---
> 
> 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

And I'm the dont-code-in-cpp-when-you-could-code-in-C maintainer.
-
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