linux-kernel - Re: [PATCH 4/6] Implement a general log2 facility in the kernel

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Message-ID: <20060913155734.GA6355@intel.com>
Date:	Wed, 13 Sep 2006 08:57:34 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...l.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 4/6] Implement a general log2 facility in the kernel

On Wed, Sep 13, 2006 at 02:03:00PM +0100, David Howells wrote:
> From: David Howells <dhowells@...hat.com>
> 
> This facility provides three entry points:
> 
> 	log2()		Log base 2 of u32
> 	ll_log2()	Log base 2 of u64
> 	long_log2()	Log base 2 of unsigned long

The names are rather counter-intuitive. "ll" sounds like "long long", so
why does it opearte on *unsigned* 64-bit?  Ditto for "long_log2()".
Perhaps they should be log2_u32(), log2_u64(), etc.

Even better if someone can come up with the right pre-processor magic
using sizeof/typeof so that you could just use "log2(any type)"


-Tony
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