linux-kernel - Re: kfree(0)

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Message-ID: <Pine.LNX.4.64.0708150928200.19270@fbirervta.pbzchgretzou.qr>
Date:	Wed, 15 Aug 2007 09:28:54 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jason Uhlenkott <jasonuhl@...onuhl.org>
cc:	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 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.

>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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