linux-kernel - [PATCH 0/4] rcu: don't assume the size of struct rcu

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Message-ID: <4D6CA843.3090103@cn.fujitsu.com>
Date:	Tue, 01 Mar 2011 16:03:15 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	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: [PATCH 0/4] rcu: don't assume the size of struct rcu_head

We always keep the struct rcu_head very small, but we may change it in future
or under some CONFIGs.

There are some other systems may assume the size of struct rcu_head as 2 * sizeof(long).
These assumptions obstruct us to add debug information or priority information
to struct rcu_head. It is time to fix them.

It is glad that I just find 3 places which need to be fixed. These 4 patches
are just cleanup patches when the size of struct rcu_head == 2 * sizeof(long).
NO overhead added and NO behavior changed.
Even when the size of struct rcu_head becomes larger, only slub is changed a little.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---

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