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

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Message-ID: <2f11576a0902190412m5b473a39o8b8fffa3f58c83d8@mail.gmail.com>
Date:	Thu, 19 Feb 2009 21:12:49 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	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()

2009/2/19 Pekka Enberg <penberg@...helsinki.fi>:
> 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.
>
> On Thu, 2009-02-19 at 10:22 +0900, KOSAKI Motohiro wrote:
>> 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.
>
> Debatable, sure, but doesn't seem like a big enough reason to make
> kzfree() differ from kfree().

Sure.
ok, I don't oppse this :)
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