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

[David Miller]

From: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>

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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