linux-kernel - Re: [patch 1/7] slab: introduce kzfree()

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Date:	Thu, 19 Feb 2009 10:22:24 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	kosaki.motohiro@...fujitsu.com,
	David Vrabel <david.vrabel@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chas Williams <chas@....nrl.navy.mil>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [patch 1/7] slab: introduce kzfree()

> On Wed, 2009-02-18 at 10:50 +0000, David Vrabel wrote:
> > Johannes Weiner wrote:
> > > +void kzfree(const void *p)
> > 
> > Shouldn't this be void * since it writes to the memory?
> 
> No. kfree() writes to the memory as well to update freelists, poisoning
> and such so kzfree() is not at all different from it.

I don't think so. It's debetable thing.

poisonig is transparent feature from caller.
but the caller of kzfree() know to fill memory and it should know.



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