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Message-ID: <46655CEC.7070900@gmail.com>
Date: Tue, 05 Jun 2007 14:54:04 +0200
From: Rene Herman <rene.herman@gmail.com>
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To: "John Anthony Kazos Jr." <jakj@j-a-k-j.com>
CC: Christoph Lameter <clameter@sgi.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Pekka Enberg <penberg@cs.helsinki.fi>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       linux-kernel@vger.kernel.org, Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)
References: <Pine.LNX.4.64.0706011831170.10767@schroedinger.engr.sgi.com> <alpine.LFD.0.98.0706041143240.23741@woody.linux-foundation.org> <Pine.LNX.4.64.0706041200140.24550@schroedinger.engr.sgi.com> <84144f020706041213x1d241794u98e9b3ca29865033@mail.gmail.com> <Pine.LNX.4.64.0706041213540.24935@schroedinger.engr.sgi.com> <46646747.2080803@cs.helsinki.fi> <Pine.LNX.4.64.0706041532350.27125@schroedinger.engr.sgi.com> <20070604155355.bf29a3a8.akpm@linux-foundation.org> <Pine.LNX.4.64.0706041607560.27346@schroedinger.engr.sgi.com> <466523E0.3050605@gmail.com> <alpine.DEB.0.99.0706050804170.27388@sigma.j-a-k-j.com>
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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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