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

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Date:	Mon, 8 Jan 2007 00:31:44 -0800 (PST)
From:	Amit Choudhary <amit2030@...oo.com>
To:	Pekka Enberg <penberg@...helsinki.fi>, Hua Zhong <hzhong@...il.com>
Cc:	Amit Choudhary <amit2030@...oo.com>,
	Christoph Hellwig <hch@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] include/linux/slab.h: new KFREE() macro.

--- 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.

-Amit

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