linux-kernel - Re: [PATCH] include/log2.h: Fix rounddown_pow_of

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Message-ID: <1323806736.28489.0.camel@twins>
Date:	Tue, 13 Dec 2011 21:05:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dmitry Torokhov <dtor@...are.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	pv-drivers@...are.com, Andrei Warkentin <andreiw@...are.com>,
	stable@...nel.org
Subject: Re: [PATCH] include/log2.h: Fix rounddown_pow_of_two(1)

On Tue, 2011-12-13 at 21:00 +0100, Peter Zijlstra wrote:
> On Mon, 2011-12-12 at 10:02 -0800, Dmitry Torokhov wrote:
> > 1 is a power of two, therefore rounddown_pow_of_two(1) should return 1.
> 
> x^0 = 1
> x^1 = x
> 
> Seems to me 0 was the right answer, no?

n/m head-up-arse, missed that this wasn't actually a log variant.
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