netdev - Re: [PATCH 2/4] slub,rcu: don't assume the size of struct rcu

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Message-ID: <alpine.DEB.2.00.1103081224550.25214@router.home>
Date:	Tue, 8 Mar 2011 12:25:41 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/4] slub,rcu: don't assume the size of struct rcu_head

On Tue, 1 Mar 2011, Lai Jiangshan wrote:

> -		 * RCU free overloads the RCU head over the LRU
> -		 */
> -		struct rcu_head *head = (void *)&page->lru;
> +		struct rcu_head *head;
> +
> +		if (need_reserve_slab_rcu) {
> +			int order = compound_order(page);
> +			int offset = (PAGE_SIZE << order) - s->reserved;
> +
> +			BUG_ON(s->reserved != sizeof(*head));

VM_BUG_ON is sufficient here I think.

Otherwise

Acked-by: Christoph Lameter <cl@...ux.com>

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