linux-kernel - Re: SLUB: Return ZERO_SIZE

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Message-ID: <46655CEC.7070900@gmail.com>
Date:	Tue, 05 Jun 2007 14:54:04 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	"John Anthony Kazos Jr." <jakj@...-k-j.com>
CC:	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)

On 06/05/2007 02:07 PM, John Anthony Kazos Jr. wrote:

> The name says exactly what it is. It's not at all dreadful. If we're going 
> to return a special value in the zero-size case (and in only that case) as 
> a valid pointer instead of actually allocating one byte and treating it as 
> zero, what we have is...a zero-size pointer.

No, what we have is a sizeof(pointer) sized pointer pointing to an object of 
size zero. ZERO_SIZE_PTR is butt-ugly. With a really ugly butt.

Rene.

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