linux-kernel - Re: [PATCH] Fix roundup_pow_of

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Message-ID: <20070604131723.GV5500@stusta.de>
Date:	Mon, 4 Jun 2007 15:17:24 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	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, Jun 04, 2007 at 02:13:11PM +0200, Rolf Eike Beer wrote:
> Adrian Bunk wrote:
> > On Thu, May 17, 2007 at 11:56:56PM +0200, Rolf Eike Beer wrote:
> > > Fix roundup_pow_of_two(1)
> > >
> > > 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
> 
> Yes. But it returned 0 (not 1 << 0).

Sorry, I had a thinko and you are right.

> Eike

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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