linux-kernel - Re: SLUB: Return ZERO_SIZE

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Date:	Tue, 05 Jun 2007 16:32:00 +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 03:58 PM, John Anthony Kazos Jr. wrote:

> So "ZERO_SIZE_OBJ_PTR" is the most correct form, and "ZERO_SIZE_PTR" is a
> convenient shortening. "ZERO_PTR" is too short and also confuses with NULL
> because NULL is a zero-value object, rather than a non-zero--value pointer to
> a zero-size object.

Like I said, I would prefer NIL of if absolutely need be NIL_PTR. NULL is a 
pointer that doesn't point anywhere valid -- NIL is a pointer that points to a 
zero sized object.

If I'd have a few small children around I'd show them the word ZERO_SIZE_PTR and 
make pictures of them bursting out in tears.

Rene.

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