linux-kernel - Re: [PATCH] include/linux/slab.h: new KFREE() macro.

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Message-ID: <20070108083721.GE17561@ftp.linux.org.uk>
Date:	Mon, 8 Jan 2007 08:37:21 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Amit Choudhary <amit2030@...oo.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Hua Zhong <hzhong@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] include/linux/slab.h: new KFREE() macro.

On Mon, Jan 08, 2007 at 12:31:44AM -0800, Amit Choudhary wrote:
> 
> --- Pekka Enberg <penberg@...helsinki.fi> wrote:
> 
> > On 1/8/07, Hua Zhong <hzhong@...il.com> wrote:
> > > > And as I explained, it can result in longer code too. So, why
> > > > keep this value around. Why not re-initialize it to NULL.
> > >
> > > Because initialization increases code size.
> > 
> > And it also effectively blocks the slab debugging code from doing its
> > job detecting double-frees.
> > 
> 
> Man, so you do want someone to set 'x' to NULL after freeing it, so that the slab debugging code
> can catch double frees. If you set it to NULL then double free is harmless. So, you want something
> harmful in the system and then debug it with the slab debugging code. Man, doesn't make sense to
> me.

_Definitely_ cargo-cult programming...
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