netdev - Re: [RCU PATCH 06/14] net: sched: fw use RCU

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Date:	Wed, 12 Mar 2014 10:01:13 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	xiyou.wangcong@...il.com, jhs@...atatu.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [RCU PATCH 06/14] net: sched: fw use RCU

On Wed, 2014-03-12 at 09:41 -0700, John Fastabend wrote:

> Rearranging the rcu_head placement above results in this error:
> 
> net/sched/cls_fw.c: In function ‘fw_destroy’:
> net/sched/cls_fw.c:169:279: error: call to ‘__compiletime_assert_169’ 
> declared with attribute error: BUILD_BUG_ON failed: 
> !__is_kfree_rcu_offset(__builtin_offsetof(typeof(*(head)),rcu))
> 
> 
> However it seems best to have the rcu_head at the end of the struct
> so I'll just convert the kfree_rcu() to call_rcu().


I missed HTSIZE was so big.

Its unfortunate because it makes struct fw_head slightly larger than one
page.


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