linux-kernel - Re: kfree(0)

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Message-Id: <1187394022.7007.133.camel@chaos>
Date:	Sat, 18 Aug 2007 01:40:22 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <clameter@....com>,
	Satyam Sharma <satyam@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Tim Bird <tim.bird@...sony.com>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: kfree(0) - ok?

On Sat, 2007-08-18 at 00:42 +0300, Pekka Enberg wrote:
> On 8/18/07, Christoph Lameter <clameter@....com> wrote:
> > That was merged over my objections. IMHO ksize(NULL) should fail since we
> > are determining the size of an unallocated object.
> 
> Agreed, especially as we have real zero-sized objects returned from
> kmalloc() et al now.

Do we really ? 

If yes, who invented this 1980s reminiscence, where you got valid
pointers for malloc(0) ?

This is completely stupid. You do not go into a bar and order an empty
glass, just because you might eventually become thirsty later.

	tglx


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