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

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Message-Id: <20110301.001638.104075130.davem@davemloft.net>
Date:	Tue, 01 Mar 2011 00:16:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	laijs@...fujitsu.com
Cc:	mingo@...e.hu, paulmck@...ux.vnet.ibm.com, cl@...ux-foundation.org,
	penberg@...nel.org, eric.dumazet@...il.com, mpm@...enic.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] net,rcu: don't assume the size of struct rcu_head

From: Lai Jiangshan <laijs@...fujitsu.com>
Date: Tue, 01 Mar 2011 16:03:44 +0800

> 
> struct dst_entry assumes the size of struct rcu_head as 2 * sizeof(long)
> and manually adds pads for aligning for "__refcnt".
> 
> When the size of struct rcu_head is changed, these manual padding
> is wrong. Use __attribute__((aligned (64))) instead.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>

We don't want to use the align if it's going to waste lots of space.

Instead we want to rearrange the structure so that the alignment comes
more cheaply.
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