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

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Message-ID: <3565.1170326639@redhat.com>
Date:	Thu, 01 Feb 2007 10:43:59 +0000
From:	David Howells <dhowells@...hat.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Paul Mackerras <paulus@...ba.org>, dhowells@...hat.com,
	galak@...nel.crashing.org
Subject: Re: [PATCH] Add "is_power_of_2" checking to log2.h. 


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.

I also wonder if there's some better way of implementing it than this, but I
can't think of one offhand.

David
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