linux-kernel - Re: [PATCH -mm 3/6] slub: introduce __kfree

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Message-ID: <alpine.DEB.1.10.0903041003200.3850@qirst.com>
Date:	Wed, 4 Mar 2009 10:06:17 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 3/6] slub: introduce __kfree_rcu

On Tue, 3 Mar 2009, Lai Jiangshan wrote:

> +
> +void __kfree_rcu(const void *x, struct rcu_head *rcu)
> +{
> +	call_rcu(rcu, kfree_rcu_callback);
> +}
> +EXPORT_SYMBOL(__kfree_rcu);
> +

The parameter x is unused why require it? I see that SLOB needs it. Cant
you do a similar trick as in SLUB just calculating the start address of
the object from the rcu address?

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