linux-kernel - Re: [PATCH] Fix roundup_pow_of

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Message-ID: <Pine.LNX.4.64.0706041431310.29896@twin.jikos.cz>
Date:	Mon, 4 Jun 2007 14:33:05 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Adrian Bunk <bunk@...sta.de>
cc:	Rolf Eike Beer <eike-kernel@...tec.de>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org
Subject: Re: [PATCH] Fix roundup_pow_of_two(1)

On Mon, 4 Jun 2007, Adrian Bunk wrote:

> > 1 is a power of two, therefore roundup_pow_of_two(1) should return 1. It does
> > in case the argument is a variable but in case it's a constant it behaves
> > wrong and returns 0. Probably nobody ever did it so this was never noticed.
> I'm not getting the problem.
> 2^0 = 1

Adrian,

that's of course true, but unrelated to the patch in question :)

You simply want roundup_pow_of_two(1) to be 1, and not 0. That's what the 
patch does, and that's correct.

-- 
Jiri Kosina
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