linux-kernel - Re: SLUB: Return ZERO_SIZE

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Message-Id: <20070601204141.f84ad72f.akpm@linux-foundation.org>
Date:	Fri, 1 Jun 2007 20:41:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	jeremy@...p.org
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)

> On Fri, 1 Jun 2007 18:37:46 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
>
> +#define ZERO_SIZE_PTR ((void *)16)

Jeremy's point was a good one.  The kernel _does_ use address-comparison
to determine object-inequality in an unknown but non-zero number of places.

It is of course unlikely that this will occur in conjunction with zero-sized
objects, but who knows?
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