linux-kernel - Re: kfree(0)

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Message-ID: <Pine.LNX.4.64.0708151113410.19270@fbirervta.pbzchgretzou.qr>
Date:	Wed, 15 Aug 2007 11:20:33 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Rene Herman <rene.herman@...il.com>
cc:	Jason Uhlenkott <jasonuhl@...onuhl.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 Aug 15 2007 10:37, Rene Herman wrote:
> On 08/15/2007 09:28 AM, Jan Engelhardt wrote:
>> On Aug 14 2007 16:21, Jason Uhlenkott wrote:
>
>> > On Tue, Aug 14, 2007 at 15:55:48 -0700, Arjan van de Ven wrote:
>> > > NULL is not 0 though.
>> > It is.  Its representation isn't guaranteed to be all-bits-zero,
>> 
>> C guarantees that.
>
> C guarantees what? If you're disagreeing with Jason -- he's right.

http://coding.derkeiler.com/Archive/C_CPP/comp.lang.c/2003-11/1808.html

>> > but the constant value 0 when used in pointer context is always a
>> > null pointer (and in fact the standard requires that NULL be
>> > #defined as 0 or a cast thereof).


	Jan
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