linux-kernel - Re: [PATCH] Add "is_power_of

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Message-ID: <Pine.LNX.4.64.0702010546400.13434@CPE00045a9c397f-CM001225dbafb6>
Date:	Thu, 1 Feb 2007 05:49:28 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	David Howells <dhowells@...hat.com>
cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Paul Mackerras <paulus@...ba.org>, galak@...nel.crashing.org
Subject: Re: [PATCH] Add "is_power_of_2" checking to log2.h.

On Thu, 1 Feb 2007, David Howells wrote:

>
> Robert P. J. Day <rpjday@...dspring.com> wrote:
>
> > +#define is_power_of_4(x)	is_power_of_2(x) && (ffs(x) & 1))
>
> If this is such a commonly implemented op, it should probably be implemented
> globally too.

there are only two checks of the form "is_power_of_4" in the entire
tree, and they're both in the power pc stuff, so i doubt it's worth
trying to formalize that in any way.

rday

-- 
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Robert P. J. Day
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Waterloo, Ontario, CANADA

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