Date: Mon, 4 Jun 2007 10:59:24 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <clameter@sgi.com>, linux-kernel@vger.kernel.org,
       torvalds@linux-foundation.org, jeremy@goop.org
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)
Message-ID: <20070604175924.GE15426@holomorphy.com>
References: <Pine.LNX.4.64.0706011831170.10767@schroedinger.engr.sgi.com> <20070601204141.f84ad72f.akpm@linux-foundation.org> <Pine.LNX.4.64.0706012057580.11358@schroedinger.engr.sgi.com> <20070601213117.1178e8e0.akpm@linux-foundation.org> <Pine.LNX.4.64.0706012139480.11577@schroedinger.engr.sgi.com> <20070601215427.f06d09e7.akpm@linux-foundation.org>
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On Fri, 1 Jun 2007 21:45:15 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
>> That would have to occur with objects that are repeatedly allocated and 
>> then linked toghether etc. Linking typicallty requires a listhead so its 
>> typically difficult to do zero length objects.

On Fri, Jun 01, 2007 at 09:54:27PM -0700, Andrew Morton wrote:
> Well I can't immediately think of a scenario in which it's likely to occur,
> but we're in the position of trying to prove a negative.
> Poke Bill Irwin - he'll think of something ;)

I've yet to see anyone get quite that creative, but I've not gone fishing
for instances of this. I can think of plenty of places where one could do
something like this in practice, but don't care to give anyone any ideas.


-- wli
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